bluuebunny/crossref_metadata_2025 huggingface dataset:
Streulicht- und Temperaturverlauf bei der Kondensation von Äthanoldampf / Pattern of Change of Light Scattering and Temperature during the Condensation of Ethanol Vapor
Authors: Nebrich E. , Mohrmann H.
Published: March 2015

Saturated ethanol vapour in an atmosphere of nitrogen was expanded in a cloud chamber. The condensation arising thereby was shown by light scattering. At the same time the temperature curve occurring after the expansion was measured by means of a resistance thermometer.

Experiments with twenty different expansion ratios (from E=1,083 to E= 1,324) were carried out at room temperature. The expansions were polytropic at n = 1,24.

Supersaturations were obtained at about 1,3 and 1,5 regardless of E and never attained the critical value of 2,1. Nevertheless a condensation was shown every time, although nuclei were not present. The cloud vanished shortly after its appearence, long before the initial temperature could be reached again. The formation as well as start and finish of the evaporation of this “subcritical fog” can be traced exactly in the registered temperature curves. The simultaneous light scatteringand temperature measurement make a stronger interpretation of the temperature curves recorded by STACHORSKA also possible.
Electronic spectra of MoO3S2⊖ and WO3S2⊖ and their comparison with the spectra of the ions MoOx S2⊖
4-x and WOx S2⊖
4-x
Authors: Müller A. , Diemann E. , Ranade A. C. , Aymonino P. J.
Published: March 2015

The electronic spectra of MoO3S2⊖ and WO3S2⊖ are measured in aqueous solution. They are discussed and compared with electronic spectra of other thiomolybdates and -tungstates.
Bis(thiophosphoryldifluorid)sulfide
Authors: Roesky Herbert W. , Dietl Michael
Published: March 2015

Die Darstellung von

und

wird beschrieben und ihre Eigenschaften werden mitgeteilt. Die Verbindungen lassen sich anhand ihrer IR- und 19F-KMR-Spektren unterscheiden.
Potentiometric Studies on Stepwise Mixed Ligand Complex Formation Copper(II)-Iminodiacetic Acid-Hydroxy Acid
Authors: Sharma G. , Tandon J. P.
Published: March 2015

Potentiometric studies are described for mixed ligand complex formation of copper(II) with iminodiacetic acid (IMDA) as primary ligand and certain hydroxy acids, such as salicylic acid (SA), 5-sulphosalicylic acid (SSA), tiron (3.5-pyrocatechol disulphonic acid PDS) and chromotropic salt (3,6-disulpho-1,8-dihydroxynaphthalene disodium salt CS) as secondary ligands. The pH titrations of the reaction mixtures containing copper nitrate, iminodiacetic acid and one of the secondary ligands in equimolar concentrations indicated the formation of 1:1:1 mixed ligand complex. From the nature of the titration curves it appears that in the lower buffer region 1:1 copper (II) -iminodiacetic acid complex is initially formed and the formation of mixed ligand complex takes place only after the combination with the primary ligand is complete. However, in the case of Cu (II) -IMDA-HQSA system it appears that the mixed ligand complex is not formed stepwise, but the chelation with both the ligands takes place simultaneously. The formation constants (log K) of the mixed ligand chelates of Cu (II) -IMDA-SA. Cu (II)-IMDA-SSA. Cu (II) -IMDA-Tiron and Cu (II) -IMDA-CS system have been calculated. All the titrations were carried out at room temperature (25±1°C) using 5 × 10 3 м concentration of metal and ligand ions (μ= 0.1) with the help of potassium nitrate.
Chemische Untersuchungen an Chondroitinsulfat- und Heparansulfat-Peptiden aus menschlichen Aorten IV
Authors: Klemer A. , Mempel D. , Römer K.
Published: March 2015

Unabhängig vom Lebensalter und Sklerosegrad enthalten menschliche Aorten gleichartig aufgebaute Chondroitinsulfat- und Heparansulfat-Peptide, wobei das Verhältnis der Chondroitinsulfat-Peptide A und C etwa konstant bleibt.

Der Gehalt menschlicher Aorten an Chondroitinsulfat-Peptiden ist in Abhängigkeit vom Lebensalter und Sklerosegrad verschieden. Den höchsten Gehalt hat die Aorta bei beginnender Sklerose. Einen gleichartigen Gang in der quantitativen Verteilung findet man beim Heparansulfat-Peptid.
Zur Metachromasie von Toluidinblau in Gegenwart von Nucleinsäuren
Authors: Tempel K.
Published: March 2015

1. Nach Zusatz von Nucleinsäuren zu wäßrigen Toluidinblaulösungen treten neue Farbqualitäten auf. Ihre Absorptionsmaxima lagen bei 655, 585 und 555 nm.

2. Art und Umfang dieser Metachromasie sind abhängig vom Reaktionsmilieu, vom Farbstoff-Polyanionen-Konzentrationsverhältnis sowie von Molekülgröße und Nativität der einzelnen Nucleinsäurepräparate.

3. In wäßrigen Proteinlösungen gelöste hochmolekulare DNS-Präparate verhalten sich gegenüber DNS-Lösungen ohne Proteinzusatz wie Präparate höherer Nativität.

4. Änderungen der metachromotropen Eigenschaften von DNS-Protein-Lösungen sind qualitativ und quantitativ als empfindlicher Nachweis für denaturierende Einflüsse (Hitze, ionisierende Strahlen, UV-Licht, Ultraschall, Tris- (β-chloräthyl) -amin oder DNase I) verwertbar.
Über die Strukturspezifität der Saponinhämolyse / Structural Specifity of Saponin Hemolysis
Authors: Schlösser E. , Wulff G.
Published: March 2015

A considerable number of saponins and aglycones of the triterpene type has been tested for hemolytic activity. From the results it is deduced, that the optimum hemolytic activity depends on the following structural arrangements. Aglycones require a polar grouping in ring A and a moderate polar grouping in ring D or E. Compounds containing a 16α-OH or 16-keto group together with a 3/β-OH group had the highest hemolytic potential of the substances tested. The distance of 10,5 A between 3/β-OH and 16α·ΟΗ appears to be of special significance. Acylation of either group results in a remarkable loss of activity.

With saponins, which bear a sugar chain on 3/β-OH, the distance between the strong and the weak polar grouping is less critical. The composition of the sugar chain has a certain influence on the hemolytic power. A polar grouping in ring D and/or E, such as a sugar chain or a number of OH-groups, results in considerable inactivation of the substance.
Die Dosisabhängigkeit der intestinalen Eisenresorption bei Menschen mit normalen Eisenreserven und Personen mit prälatentem/latentem Eisenmangel / Dose Relationship of Intestinal Iron Absorption in Man with Normal Iron Stores and Persons with Prelatent/Latent Iron Deficiency
Authors: Heinrich H. C. , Gabbe E. E. , Whang D. H.
Published: March 2015

An estimation of the dose relationship of intestinal iron absorption in man is only reasonable if a reliable method for the measurement of iron absorption is used, and the amount of available storage iron, which influences iron absorption considerably, is considered. Intestinal 59Fe2⊕-absorption was therefore quantitated by measuring the whole body retention of absorbed 59Fe within a 4 π-large volume radioactivity detector with liquid organic scintillator. The diagnostic 10 μΜοl (⧋ 0.558 mg) 59Fe2⊕-absorption test was used for discriminating between persons with normal 59Fe-absorption due to normal iron stores and persons with very much increased 59Fe-absorption caused by depleted iron stores.

Within a dose range from 0.56 to 50 mg 59Fe2® the bilogarithmic plotting of the estimated 59Fe2⊕-absorption (in mg) against the iron dose resulted in a straight line, which can be described in males and females with normal iron stores by the equations Rmg = 0.206 · D0.676 and Rmg = 0.250-D0.668 respectively. In males and females with depleted iron stores the dose relationship can be characterized by the absorption equations Rmg=0.594·D0.684 and Rmg=0.731·D0.650 respectively.

The whole body 59Fe turnover rate in man (= iron requirement) and the dose relationship of intestinal 59Fe-absorption are a suitable experimental basis for the oral iron prophylaxis and therapy.
Elektrochromie von Chlorophyll-a und Chlorophyll-b in monomolekularen Filmen / Electrochromie Effects of a Chlorophyll a and a Chlorophyll b Monolayer
Authors: Kleuser D. , Bücher H.
Published: March 2015

A electric field induced linear and quadratic change in the optical absorption of a chlorophyll a and chlorophyll b monolayer is reported. The chlorophylls are incorporated in a fatty acid monolayer condenser which allows the application of external field strength up to 4 · 106 V/cm. The spectrum of the quadratic electrochromic effect shows evidence of different species of aggregates of chlorophyll a and of different behaviour of aggregation of chlorophyll a and b.
Strahleninduzierte freie Radikale in phosphororganischen Verbindungen III
Authors: Lassmann G. , Damerau W. , Lohs Kh.
Published: March 2015

The formation and conversion of primary radicals in the irradiated phosphonic acid ester trichlorphon and some related compounds at 77 °K have been studied by ESR. The irreversible changes of spectra by annealing of the sample demonstrate that the chlorine-containing radical type R-CCl2
1 formed at room temperature represents a secondary type having a precursor with a short half life in the form of a primary radical of similar structure but different conformation which is stable from 77°K to 245°K. A further radical formed at 77°K in trichlorphon is

This type disappears at -60°C. In related compounds (DDVP and the acetic acid ester of trichlorphon) a similar radical CH2OR is induced, which in contrast to trichlorphon is converted into an oxygen radical with g=2,0076 and g= 2,017.
Die Strahlenchemie des Hexachlorbutadiens / The Radiation Chemistry of Hexachlorobutadiene
Authors: Drawe H. , Grübel K.
Published: March 2015

Hydrogen chloride, cyclohexylchloride and the new compound C4Cl5-C6H11 (cyclohexylpentachlorobutadiene) are formed when mixtures of hexachlorobutadiene and cyclohexane are exposed to γ-radiation or 2 MeV-electrons from an accelerator. The mass- and IR-spectrometric analyses of the new product indicate that the C6H11-group is bound mainly to a primary C-atom of the hexachlorobutadiene. The 100 eV-yield of C4Cl5- C6H11 is of the order of 3.3 ± 0.15 molecules/100 eV. Because hexachlorobutadiene is a by-product in the technical synthesis of chlorine containing hydrocarbons' new reactions of this compound could be of industrial importance. A mechanism is formulated to explain the formation of the products.
Fluorometrische Untersuchungen über die Bildung von Enzym-Coenzym-Komplexen der Lactat-Dehydrogenase aus Schweineherz mit Coenzymbruchstücken und Coenzymmodellen
Authors: Woenckhaus C. , Jeck R.
Published: March 2015

Fluorescense spectra of lactate dehydrogenase * (E.C. 1.1.1.27) were investigated in the presence of the coenzyme fragments dihydronicotinamide mononucleotide and dihydronicotinamide-ribose-5'-pyrophospho- (P2) -5“-ribose. The reduced mononucleotide is enzymatically less active as a hydrogen donor. However, formation of a complex with the enzyme was not observed under the conditions used. All the other substances: dihydronicotinamide-ribose-5'-pyrophospho- (P2) -5“-ribose, dihydronicotinamide- benzimidazole-dinucleotide, dihydronicotinamide-3-desazapurine-dinucleotide and dihydronicotinamide-6-mercaptopurine-dinucleotide form more or less stable complexes with lactate dehydrogenase. The complexes do not markedly differ from the complex formed with the natural cofactor. In all cases spectra indicate change in conformation of the coenzyme by forming the coenzyme-enzyme-complex which has been proposed by VELICK 1 too. The cysteine residues of the lactate dehydrogenase are not essential for binding the coenzyme to the active center; this was shown with mercury blocked enzyme.
Übergangsmetallchalkogen-Verbindungen
Authors: Aymonino Pedro J. , Schulze Hartmut , Müller Achim
Published: March 2015

The unknown infrared and electronic spectra of MnO3F, MnO3Cl, ReO3F and Cro3Cl⊖ have been measured and assigned. The band contour of the A1 type vibrations of gaseous MnO3F were carefully measured and compared with the calculated ones: Δ (Ρ — R): calc: 21,0 cm-1 — obs: 21,8 and 22,0 cm-1.
Über Arthopoden-Abwehrstoffe XLIV.
Authors: Schildknecht H. , Birringer H.
Published: March 2015

Neben dem männlichen Sexualhormon Testosteron (28 μg) konnten auch die weiblichen Sexualhormone Östron (2 μg) und 17β-Östradiol (19 μg) im Prothorakalwehrsekret des Schlammschwimmers I. fenestratus nachgewiesen werden.
Change in DNA after Exposure to Hydrogen Atoms.
Authors: Jung, H. , Hagen, U. , Ullrich, M. , Petersen E. E.
Published: March 2015

The action of hydrogen atoms — generated in an electrodeless high frequency gas discharge — on calf thymus DNA in aqueous solution was investigated. The loss of priming activity was compared with the appearance of single strand breaks in native and denatured DNA, double strand breaks, denatured zones, base damage and rupture of hydrogen bonds. The primary lesions after exposure to H atoms and gamma radiation, respectively, are single strand breaks and base damage. Double strand breaks originating from accumulation of single breaks, and rupture of hydrogen bonds caused by single breaks and base damage, were identified as secondary lesions. In relation to strand breaks arising from radical attack on the sugar-phosphate backbone of the DNA molecule, base damage is about 12.5 times more frequent after Η-exposure than after γ-irradiation. It is concluded from this observation, that single strand breaks are the predominant critical lesions responsible for the loss of the functional activity of DNA.
Characterization of Tetrachloroaminoborane
Authors: G. Haasnoot J. , Groeneveld W. L.
Published: March 2015

Tetrachloroaminoborane (Cl2BNCl2) has been prepared from nitrogen trichloride and boron trichloride. Its 11B NMR shift with respect to boron trifluoride-diethylether is —34.7 ppm. The infrared frequency of the B-N stretching vibration appears to be 1312 cm-1.
Cyanamid-Komplexe von Übergangsmetallen / Cyanamide Complexes of Transition Metals
Authors: Beck Wolfgang , Bock Henning , Schlodder Rainer
Published: March 2015

The preparation of the complexes (Ph3P)2(CO)IrNCNIr(CO)PPh3)2, (Ph3P)2Ir(CO)-NCNH, [AsPh4]2[Pd(NCNR)4] (R = H,Ph), (Ph3P)2Pd(NCNH)2 is described. The vibrational and 14N NMR spectra are reported. In the complexes [Ni(H2NCN)e]Br2, [Ni(H2NCN)4]Cl2, [Co(H2NCN)4]Cl2 the cyanamide ligand presumably is coordinated through the amino nitrogen atom.
Polarography of 2,2′-Bipyridyl Dimethiodide in Aqueous Solution
Authors: Summers L. A.
Published: March 2015

2,2′-Bipyridyl dimethiodide in aqueous solution in the pH range 5.0-8.9 gives a symmetrical one-electron reduction wave independent of pH and concentration at a potential of —0.96 V against a standard calomel electrode due to the formation of the corresponding radical cation. At a much lower potential it also shows a second reduction wave which is pH dependent.
Pilzpigmente, XIX / Pigments of Fungi, XIX
Authors: Steglich Wolfgang , Besl Helmut , Zipfel Klaus
Published: March 2015

The NMR spectra of pulvinic acids show large differences in the chemical shifts of the 2,6 and 2′, 6′ aromatic protons. This allows an unambiguous differentiation between the two possible isomers of unsymmetrically substituted pulvinic acids. Xerocomic acid, isoxerocomic acid and gomphidic acid have been shown to possess structures 1 a, 1 b and 2 a respectively.
Untersuchung einer kupferreichen Phase Cu0.64V2O5 / Investigation of the Phase Cu0.64V2O5
Authors: Christian H.-P. , Müller-Buschbaum Hk.
Published: March 2015

Single crystals of Cu0.64V2O5 were prepared by hydrothermal synthesis. The X-ray investigation shows an orthorhombic unit cell: α = 11.313, b = 4.804 and c = 3.613 Å, space group D2h
13-Pmnm. Cu0.64V2O5 has a network equal to that of V2O5. Copper is inserted between the layers with an extraordinary coordination and remarkable long Cu–O distances.
Untersuchungen an Chinolacetaten, III / Quinol Acetates, III
Authors: Budzikiewicz H. , Gunawan J.
Published: March 2015

Reaction of 2-acetoxy-cyclohexa-3,5-dienones (“quinol acetates”) with BF3 or (CH3CO)2O/BF3 in the presence of benzene derivatives (mesitylene, mesitol, 1,3-dimethoxy benzene, 1,3,5-trimethoxy benzene) yields biphenyl and diphenyl methane derivatives whose structure has been elucidated mainly from their spectroscopic data.
Notizen: Hochdruckreaktionen von CuAlS2 und CuAlSe2 / High Pressure Reactions of CuAlS2 and CuAlSe2
Authors: Range Klaus-Jürgen , Engert Gerd , Zabel Manfred
Published: March 2015

CuAlS2 and CuAlSe2 decompose at high pressures and temperatures according to 5 CuAlX2 → 2 Cu2X + CuAl5X8.
Darstellung eines dreikernigen Rh(III), Co(III)-Komplexes mit Oxalat als dreizähligem Ligand / Preparation of a Mixed Trinuclear Rh(III), Co(III)-complex with Oxalate as a Tridentate Ligand
Authors: Wieghardt Karl
Published: March 2015

A mixed trinuclear Co(III), Rh(III)-ammine complex containing oxalate as a tridentate bridging ligand has been prepared by reacting [Rh(NH3)5C2O4H](ClO4)2 with tri-µ-hydroxo-bis[triamminecobalt(III)]perchlorate in acidic aqueous solution.
Notizen: Catalytic Effect of Ferric Ions on the Photoinitiated Antoxidation of Sulfite
Authors: Vepřek-Šiška Josef , Luňák Stanislav , El-Wakil Ahmed
Published: March 2015

The rate of the photoinitiated autoxidation of sulfite is considerably influenced by ferric ions in trace concentrations.
Isocyanate und Isothiocyanate von cyclischen Phosphor-Stickstoff-Verbindungen / Isocyanates and Isothiocyanates of Cyclic Phosphorus Nitrogen Compounds
Authors: Roesky Herbert W. , Janssen Enno
Published: March 2015

By substitution of a halogen atom in cyclic phosphazenes by isocyanate or isothiocyanate new members of this class of compounds are synthesized. These compounds are fairly stable against hydrolysis. Reaction of the new compounds with amines yields

P3N3F5NHC(O)N(CH3)2 and P3N3F5NHC(S)N(CH3)2. With elemental chlorine P3N3F5N = CCl2 is formed. Numerous IR, NMR and mass spectra data of the new compounds are reported.
Oxidation von α-Arylamino-acetophenon-oxime / Oxidation of α-Arylamino-acetophenone-oxime
Authors: Kreher Richard , Deckardt Klaus
Published: March 2015

In connection with the oxidation of nitrogen compounds the reaction of α-arylaminoacetophenone-oximes with ferric chloride was reinvestigated. This oxidizing process doesn't lead to four membered Δ2-1,2-diazetine-2-N-oxides, as formulated by BUSCH et al. but affords presumably substituted Δ3-imidazoline-3-oxides, because of the analytical and spectroscopic results.
Die Struktur des Di-Zinn-Hexathiohypodiphosphats Sn2P2S6 / The Crystal Structure of Sn2P2Se
Authors: Dittmar G. , Schäfer Herbert
Published: March 2015

The crystal structure has been determined for one of the monoclinic modifications of Sn2P2Se. There are P2S6-groups in the structure with nearly undistorted point group summetry 3̄m. These are connected to a threedimensional network by 7-fold and 8-fold coordinated tin-atoms. The crystallographic data of the cell are: α0 = 9.378(5) Å, b0 =7.488(5) Å, c0 = 6.513(5) Å, β = 91,15°(5), Ζ = 2. The space group is nearly P21/n but slightly distorted to Pn.
Optisch aktive Übergangsmetall-Komplexe, XXVII
Authors: Brunner Henri , Rambold Wolfgang
Published: March 2015

In the reaction of C5H5Co(C3F7)[CNCH(CH3)(C6H5)] I (1a, b) with AgClO4/NH4SCN, a mixture of the N- and S-bound isomers C5H5Co(C3F7)[CNCH(CH3)(C6H5)](CNS) (2 a, b and 8 a, b) is obtained which on treatment with pentane can be transformed into (+)-C6H5Co(C3F7)[CNCH(CH3)(C6H5)](NCS) (2a). Compound 2a is stable in the solid state and in THF-solution but undergoes epimerisation and structural isomerisation in benzene or toluene solution.
Polarographic Reduction of Diphenyldiselenide
Authors: Paliani Giulio , Cataliotti Mariarosa Loiacono
Published: March 2015

The electroreduction of diphenyldiselenide has been investigated by polarography, cyclic voltammetry and coulometry. A mechanism for the reduction based on the initial two-electron transfer followed by cleavage of the Se-Se bond is proposed.
Strahlenchemische Versuche zur Erzeugung von Blei- und Zinnradikalen
Authors: Jungbluth H. , Möckel H. , Wendenburg J.
Published: March 2015

Triphenyltinchloride and -acetate, the corresponding lead compounds, and Tribenzyltinchloride are effective electron scavengers in γ-irradiated glasses from 2-Methyltetrahydrofuran at 77°K. The reaction with the electrons leads to the formation of tin- and leadradicals via dissociative electron capture. Only in the case of the benzyl compound the molecular anion is formed. Wavelength of absorption, extinction coefficients and relative rate constants are reported. The formation of lead radicals is confirmed by observation of their ESR absorption.
Chromchalkogenide, VIII
Authors: Lutz Heinz Dieter , Haeuseler Hartmut , Becker Wolfgang
Published: March 2015

A method for preparation of chromium sulphide from CrCl3·3 THF or CrCl3· 3 i-C3H7OH in isopropanol is given. For further modes of formation the following reactions are investigated: Tris-bipyridyl-chromium(0) with sulphur and both chromium triphenyl and chromium ethoxide with H2S. X-ray, IR and UV data of CrCl3 · 3 THF, CrCl3 ·3 i-C3H7OH, Cr(i-OC3H7)3 · 3 i-C3H7OH and of chromium alkoxides are included.
Umsetzungen von N- und S-Betain-Hydrohalogeniden mit Arylisocyanaten / Reactions with Betaine VIII Reactions of N- and S-Betaines Hydrohalogenides with Arylisocyanates
Authors: Wittmann Helga , Sobhi Djamschid , Dehghani Khosrow
Published: March 2015

The hydrohalogenides of N-betaines (trimethylammonioacetate, N-pyridinioacetate and 3-trimethylammoniopropionate) react only with p-nitrophenylisocyanate and bis-4-nitrophenylcarbodiimide to yield the corresponding trimethylammonium acetanilides or pyridinium acetanilide, respectivly. Whereas the hydrohalogenides of S-betaines (dimethylsulfonio acetate and S-tetrahydrothiophenioacetate) react also with p-chloro-, p-methyl and phenylisocyanate itself to give chloroacetanilides. However, with p-nitro-phenlisocyanate the same reaction as with N-betaines occurred.
Darstellung, Eigenschaften und Reaktionen von Dimethyl-phenyl- und Methyl-diphenyl-methylenphosphoran / Preparation, Properties and Reactions of Dimethylphenyl- and Methyl-diphenyl-methylenephosphorane
Authors: Schmidbaur Hubert , Heimann Michael
Published: March 2015

The ylides (CH3)2C6H5P = CH2 and CH3(C6H5),P=CH, have been prepared via their trimethylsilyl derivatives in a pure and salt-free state. Their properties and some spectroscopic data are reported. The thermal decomposition leads to the corresponding methylphenylphosphines, the addition of methanol yields a phosphine oxide and alkane or a phosphine an anisol, depending on the number of aryl groups at phosphorus. There is evidence for a pentacoordinate tetraorgano-alkoxyphosphorane as an intermediate. Protic catalysts are found to cause rapid α-proton exchange in the ylides.
Neue Methoden zur spektrophotom etrischen pK-Wertbestimmung, I / New Methods for Spectrophotometric Determination of pK-Values, I
Authors: Blume Rüdiger , Lachmann Heinrich , Mauser Heinz , Schneider Friedhelm
Published: March 2015

By means of a spectrophotometric titration at many wavelengths it is possible to determine the uniformity („Einheitlichkeit“) of the system, respectively, the number and kind of dissociable groups. Isosbestic points, absorbance-, absorbance-difference diagrams and other graphs are used for the analysis of spectrophotometric titration data. Different methods for determination of absolute pK-values of one-step titration systems are compared critically. To avoid the problems of electrometric pH-measurements some new methods are proposed to evaluate relative pK-values ( Δ pK -values) by means of a simultaneous titration of a protolyte together with a standard substance. The efficiency of these relative methods is demonstrated using two compounds with a very small pK-difference (o- and p-nitrophenol, Δ pK = 0.1). The results are controlled by simulation with a digital computer.
UV-Spektren von Aminoboranen: π→π* - und Rydberg-Übergänge / UV Spectra of Aminoboranes: π→π* and Rydberg Transitions
Authors: Fuss Werner
Published: March 2015

The near and far UV spectra of the aminoboranes (Me2N)n B X3-n, n = 1, 2, 3, Me=CH3, X= H, Me, F, Cl, Br are presented. In most of the monoamino boranes the π→π * transitions dominate. In the di- and triamino boranes there were additionally found a Rydberg series and some single Rydberg transitions, partly preceding the π→π * band. The Rydberg assignments were settled particularly by comparing the band positions of the compounds relatively to their ionization energies.
Coordination Chemisty of Phosphoguanidines, I
Authors: Nag K. , Bose S. N.
Published: March 2015

Coordination compounds of some nickel (II) salts derived from 1,3-bis(di-n-propyl-phosphinyl)guanidine (DPPG) have been synthesized and characterized from their chemical analyses, infrared spectra, electronic spectra, conductance and magnetic moment measurements. With nickel perchlorate, an octahedral complex of the type [Ni(DPPG)2](ClO4)2 has been prepared, while with corresponding chloride and iodide square planar compounds of the type [Ni(DPPG)X]X have been obtained. With nickel sulfate a 1:1 diamagnetic complex is formed in which sulfate ion is unidentately bound. In all the complexes DPPG acts as a tridentate ligand and bonding takes place from two P = O groups and the imino nitrogen atom. The solvation behavior of the complexes has also been studied.
Stepwise Photoreduction of (iso)Alloxazine N-Oxides in the Presence of 1,4-Cyclohexadiene
Authors: Gladys Monika , Knappe Wolfgang-R.
Published: March 2015

The direct synthesis of (iso)alloxazine N-oxides using trifluoroperacetic acid in situ is reinvestigated, showing sensitivity towards steric (peri) hindrance. The photoreduction of these N-oxides in the presence of 1,4-cyclohexadiene yields the parent (iso)alloxazine. The reduction of the N-oxides by initially formed dihydro (iso)alloxazine is ruled out for the photoreduction.
Notizen: OH Induced Denitration of Nitromethane
Authors: Eiben K.
Published: March 2015

Disproportionation, Denitration

Disproportionation dominates the second order reactions of the OH adduct to acinitromethane and leads to production of nitrite ion.
Notizen: Magnetic Studies on Schiff Base Complexes of Al(III) and Si(IV)
Authors: Prasad R. N. , Tandon J. P.
Published: March 2015

The magnetic susceptibilities of some newly syntesized Al(III) and Si(IV) complexes of Schiff bases derived from the condensation of o-hydroxyacetophenone or 2-dydroxy-1-naphthaldehyde with hydroxyalkylamines or diamines have been measured and the data indicate their diamagnetic character.
Thermodynamische Eigenschaften von IV–VI-Verbindungen: Bleichalkogenide / Thermodynamic Properties of IV–VI-Compounds: Leadchalcogenides
Authors: Blachnik Roger , Igel Rudolf
Published: March 2015

The enthalpy contents of leadchalcogenides at temperatures between 300°K to their melting points were measured. Enthalpies of mixing in the liquid state (for mole fractions of chalcogen = 0.5) were calculated. These values confirm the more metallic character of the melts with tellurium as one constituent element and the more covalent character of the sulfide containing melts.
Die Untersuchung der Isopolysäurebildung des Molybdats mit Hilfe dilatometrischer Titrationen, II / Formation of Isopolymolybdates Indicated by Dilatometric Titrations, II
Authors: Wiese Günther , Böse Doris
Published: March 2015

The change of the volume associated with the acidification of magnesium-molybdate-solutions was continously controlled by dilatometric titrations. In the studied concentration range the following isopolymolybdates were identified:

[HMo2O8]3-, [Μο6O21]6-, [Μο6O20]4-, [Μο6O27]6-
Untersuchung des Substituenteneinflusses auf die Massenspektren von Diphenylborchelaten aus Salicylaldehyd-Azomethinen / Investigation on the Influence of the Substituent on the Mass Spectra - of Salicylaldehyde Azomethine Diphenylboron Chelates
Authors: Hohaus Eberhard , Riepe Wolfgang
Published: March 2015

Mass spectra of several substituted diphenylboron chelates derived from salicylaldehyde azomethines were compared with respect to the influence of the amine substituent R. The fragment ion M—C6H5 is the most intensive one. The abundance of the remaining fragment ions is poor. However, there are characteristic differences of corresponding ions depending on the influence of the substituent R.
Zur Reaktivität von C=N-Doppelbindungssystemen, I / The Reactivity of the C=N Double Bond System, I
Authors: Ziegler Erich , Ott Walter , Riegler Michael
Published: March 2015

The adduct from benzylidene aniline and acetic anhydride gives 1,4-diphenyl-azetidin-2-one if heated at 210°C in diphenylmethane or diphenylsilane.
Die Kristallstruktur der Phase Li7Sn2 / The Crystal Structure of Li7Sn2
Authors: Frank Ursula , Müller Wiking , Schäfer Herbert
Published: March 2015

The crystal structure of Li7Sn2 has been determined. It crystallizes orthorhombic, space group Cmmm–D19
2h, a = 9.80 ± 0.02 A, b = 13.80 ± 0.02 Å and c = 4.75 ± 0.01 Å, isotypic to Li7Ge2. The close relations to the structure of Li7Pb2 are shown.
Schiff Base Derivatives of Lanthanons / Synthesis of La(III) Pr(III) and Nd(III) Derivatives of Ethylenediamine Bis-2,4-pentanedione
Authors: Agarwal S. K. , Tandon J. P.
Published: March 2015

The 1:1 and 2:3 molar reactions of La(III), Pr(III) and Nd(III) isopropoxides with the bifunctional tetradentate Schiff base, ethylenediamine bis-2,4-pentanedione [AA2(CH2)2H2] have been investigated in the medium of dry benzene.

Ln(O-i-C3H7) [AA2(CH2)2] and Ln2[AA2(CH2)2]3 [where, Ln = La(III), Pr(III) or Nd(III) and AA2(CH2)2
- 2 anion of the corresponding Schiff base, AA2(CH2)2H2] type of compounds have been obtained in almost quantitative yields and in a state of sufficient purity. The 1:1 derivatives have been shown to undergo exchange reactions with an excess of tert-butyl alcohol leading to the formation of Ln(O-tert-C4H9) [AA2(CH2)2] [where, Ln = La(III), Pr(III) or Nd(III)] type of derivatives. The ebullioscopic determination of molecular weights shows that the 1:1 derivatives are dimeric, whereas 2:3 derivatives are monomeric in boiling benzene. On the basis of elemental analysis, exchange reactions, molecular weight determinations and IR spectra, plausible structures for the resulting 1:1 and 2:3 complexes have been indicated.
Synthese und Eigenschaften von Dimethylsulfan-Halogenboranen, (CH3)2SBHnX3-n / Synthesis and Properties of Dimethylsulfane-haloboranes, (CH3)2SBHnX3-n
Authors: Kinberger Klemens , Siebert Walter
Published: March 2015

Dimethylsulfane-borane, (CH3)2SBH3, reacts with X2, HX and BX3 to give (CH3)2SBH2X and (CH3)2SBHX2 (X = Br, I). Although BI3 is the strongest Lewis-acid amongst the boron compounds, it does not form (CH3)2SBI3 but (CH3)2SBHI2 and B2H6, when it is mixed with (CH3)2SBH3. 1H—NMR results indicate an increase in the donor-acceptor bond strengths with decreasing n in the series (CH3)2SBHnX3-n.
Chromic Acid Oxidation of Lactic Acid Catalysed by Manganese(II)
Authors: Bhalekar A. A. , Jain C. L. , Shanker R. , Bakore G. V.
Published: March 2015

Mn(II) ion catalysis in the oxidation of lactic acid by chromic acid has been investigated between the pH range 2.0 to 4.0; [H+] = 0.1 to 0.4 and [H+] ≥1.1 M. Activation parameters for catalysed and uncatalysed reactions have been evaluated. While C—H bond rupture occurs in the uncatalysed reaction, the rate limiting step of the catalysed reaction involves C-C bond fission.
Correlation of Mössbauer Quadrupole Splitting (ΔΕQ) and Infrared Cyanide Frequency Separation in Alkali Metal Ferricyanides
Authors: Garg A. N.
Published: March 2015

Mössbauer and infrared spectra of the alkali metal ferricyanides M3
I [Fe(CN)6] · nH2O, where MI = H, Li and Na were studied at room temperature. All the three compounds displayed a doublet with small quadrupole splitting (ΔΕQ). Infrared spectra of these compounds in solid state gave two frequencies for C=N stretching vibrations with their separation (Δv) in increasing order which was found to be linearly correlated with ΔE Q. A plausible explanation has been given in terms of the interaction of Li+ and Na+ cations with the CN- ligands of octahedrally symmetric ferricyanide anion [Fe(CN)6]3- similar to that of hydrogen atoms which are hydrogen bonded in H3Fe(CN)6.
Indirekter Nachweis von Assoziaten solubilisierter, polycyclischer, aromatischer Kohlenwasserstoffe in wäßrigen Seifenlösungen durch Lichtabsorption und Fluoreszen / Indirect Evidence for Molecular Association of Polycyclic Aromatic Hydrocarbons in Aqueous Soap Solutions from Light Absorption and Fluorescence
Authors: Reske G. , Luderschmidt W. , Hammer W.
Published: March 2015

Aqueous solutions of alkyl sulphates containing small amounts of the free alkanol differ in their dissolving properties for polycyclic aromatic hydrocarbons from aqueous solutions of the pure soap in concentrations near the CMC. The differences are observed only near the CMC of the pure soap, where the soap solutions containing free alkanol have a minimum of the surface tension. The observed alterations are deviations from the Lambert-Beer law, energy transfer, and changes of the fluorescence quantum efficiencies, when the soap concentration is varied. The different results are consistent with the assumption that microcristalline molecular van der Waals associations are brought into solution by the soap solutions which were studied.
Nucleophilic Reactions of Imines
Authors: Ahmad Viqar Uddin , Basha Anwer , Rahman Atta-Ur
Published: March 2015

The reaction of imines with various electrophiles have afforded only N-alkylated products, contrary to earlier reports.
Notizen: Eine neue Synthese von β-Brasanchinon / A New Synthesis of β-Brazanquinone
Authors: Stadlbauer Wolfgang , Kappe Thomas
Published: March 2015

3-Hydroxy-2-phenyl- 1.4-naphthoquinone is cyclodehydrogenated at 250°C in the presence of palladium yielding β-brazanquinone.
Zur Kenntnis des tetrasilylierten Sulfamids und silylierter Amidosulfonsäuren / Information on Tetrasilyl Substituted Sulfamide and Silyl Substituted Amidosulfonic Acids
Authors: Buss Wolfgang , Krannich Hans-Joachim , Sundermeyer Wolfgang
Published: March 2015

Tetrakis-trimethylsilyl substituted sulfamide is obtained from N,N′-bis(trimethylsilyl)sulfamide (1) by reaction with butyl lithium and trimethyl bromosilane. Its structure is that of N,N,N′,O-tetrakis(trimethylsilyl)-sulfamide (3b). Tris(trimethylsilyl)-amidosulfonic acid (4 a) and N-alkyl-trimethylsilyl amidosulfonic acids can readily be obtained from silyl amines and trimethylester of chlorosulfonic acid (6).
Darstellung und Eigenschaften von Diacetylbis(methylimin) / Synthesis and Properties of Biacetylbis(methylimine)
Authors: Dieck Heindirk Tom , Franz Klaus-Dieter , Majunke Werner
Published: March 2015

Biacetylbis(methylimine) (1) is obtained by formic acid catalyzed condensation of biacetyl and methylamine. Photoelectron- and UV spectra, H NMR and 13C NMR data are compared with those of the new compound biacetylbis(isopropylimine) (2) and glyoxalbis(isopropylimine) (3).
Zur Reaktivität von C=N-Doppelbindungssystemen, V. Reaktionen mit Sulfonamiden / The Reactivity of the C=N-Double Bond System. V. Reactions with Sulfonamides
Authors: Ziegler Erich , Rüf Walter
Published: March 2015

Sulfonamides react with aromatic aniles and acetic anhydride in boiling xylene yielding N-benzylidene sulfonamides, which give readily adducts with 1-phenyl-3-methyl-5-pyrazolone.
Preparation and Spectral Properties of [Pt(WS4)2]2-
Authors: Müller A. , Chakravorti M. C. , Dornfeld H.
Published: March 2015

The stable complex, [Pt(WS4)2]2-, has been prepared as the tetraphenyl phosphonium salt by the reaction of K2[PtI6], (NH4)2WS4 and (C6H5)4PCl. Its vibrational and electronic spectra are reported. The [Pt(WS4)2]2- ion has D2h symmetry with a planar PtS4 chromophore. The vibrational frequencies have been assigned by a detailed analysis.
Efficiency of Photosubstitution of Arenetricarbonylchromium(0) Complexes
Authors: Wrighton Mark S. , Haverty Janice L.
Published: March 2015

The quantum efficiency of the formation of (arene)Cr(CO)2(pyridine) (arene=benzene, mesitylene) is reported as a function of the irradiation wavelength of (arene)Cr(CO)3 and as a function of pyridine concentration. The quantum efficiency is independent of pyridine concentration in the range 0.008-0.17 M. The quantum efficiency is 0.72 ± 0.07 upon 313, 366, or 436 nm irradiation. The (arene)Cr(CO)3 complexes are found to quench triplet excited benzil at a diffusion controlled rate and the quenching is accompanied by reaction of the (arene)Cr(CO)3. The reaction product which presumably arises from CO release is the same as that obtained from direct irradiation of (arene)Cr(CO)3 in the presence of benzil. However, the triplet sensitized reaction occurs with a quantum efficiency of only 0.15 ± 0.05 in contrast to the high substitution efficiency (0.72 ± 0.07) of (arene)Cr(CO)3 upon direct irradiation.
Notizen: Hexa(isocyanato)disilan / Hexa(isocyanato)disilane
Authors: Höfler F. , Peter W.
Published: March 2015

The new compound hexa(isothiocyanato)-disilane, Si2(NCO)6, is prepared by reaction of Si2Bre and AgNCO in toluene, and is characterized by mass, vibrational as well as UV spectra.
Notizen: Specific Acid Catalyzed Deuteration of the Acetyl Groups of 2,4-Diacetyldeuterohemin-OMe
Authors: Oster Oskar , Neireiter George W. , Gurd Frank R. N.
Published: March 2015

The methyl group of the acetyl groups in 2,4-diacetyldeuterohemin-OMe has been selectively deuterated. After removal of the iron, D6-2,4-diacetyl-deuteroporphyrin-OMe can be reduced to the corresponding hematoporphyrin and subsequent dehydration gives deuterated vinylic groups for protoporphyrin IX–OMe.
Li11Ge6 - eine Phase mit isolierten, ebenen Ge-Fünfringen / Li11Ge6 - a Phase with Isolated, Plane, Five-Membered Ge-Rings
Authors: Frank Ursula , Müller Wiking
Published: March 2015

A new lithium germanide Li11Ge6 has been found and its crystal structure has been determined. It crystallizes orthorhombic, α = 4.38 ± 0.01 Å, b = 24.55 ± 0.05 A, c = 10.64 ± 0.02 Å, space group Cmcm-D2h
17. The Ge-sublattice consists of isolated, plane, five-membered rings and isolated atoms.
Neue Methoden zur spektrophotometrischen pK-Wertbestimmung, III Dreistufige Titrationssysteme / New Methods for Spectrophotometric Determination of pK-Values, III Titration of Trivalent Protolytes
Authors: Blume Rüdiger , Polster Jürgen
Published: March 2015

The spectrophotometric titration of three-step sequential dissociation equilibria is analyzed by means of two dimensional absorbance diagrams. The evaluation of pK1 and pK3 as well as of the absorbance coefficients of both ampholytes is made by the uniform segments at the beginning and end of the titration. New methods of evaluating the value of pK2 precisely and without difficulty even at small pK-differences are described. By means of several independent criteria the pK-values and the absorbance coefficients of the ampholytes can be examined. The titration of (1,2,4)-benzenetricarboxylic acid illustrates the new method.
Darstellung und Eigenschaften von Phosphidbromiden des Calciums, Strontiums und Bariums / Preparation and Properties of Phosphide Bromides of Calcium, Strontium, and Barium
Authors: Hadenfeldt Claus , Kosiol Wilfried
Published: March 2015

The phosphide bromides M2PBr with M = Ca, Sr, Ba were prepared by reaction of metal, red phosphorous, and metal bromide corresponding a molar ratio M : P : Br = 2 : 1 : 1. In the systems “Ca3P2”–CaBr2 and “Sr3P2”–SrBr2 phase analytical investigations were made by varying the molar ratio M :P : Br. A cubic and a rhombohedral Ca2PBr- and Sr2PBr-phase as well as rhombohedral Ba2PBr were obtained. The cubic phases are stabilized by an excess of MBr2, the rhombohedral phases of Ca2PBr and Sr2PBr by an excess of “M3P2”

beyond the molar ratio 2:1:1. Analytical results, densities and lattice constants of the phases are given.
Kinetik und Mechanismus der Substitutionsreaktionen von Komplexverbindungen, XLVIII / Kinetics and Mechanism of the Substitution Reactions of Complexes, XLVIII
Authors: Zsakó J. , Várhelyi Cs. , Finta Z. , Kiss-Jakab J.
Published: March 2015

In aqueous solutions the nonelectrolyte [Co(DH)2(NO2)(H2O)] participates in protolytic eqilibria and thus it exists in 7 different forms. Rate constants of the aquation, which leads to the substitution of the nitro group, have been measured in the pH-range between 3.72 and 8 at various temperatures. From these data rate constants, activation energies and entropy values of the aquation of 2 ionic species have been derived, as well as equilibrium constants for the protolytic equilibrium between these species. The kinetic parameters obtained have been compared to those of the aquation of the ionic species which exist in acid and basic solutions and the correlation between structure and activation energy of the aquation has been discussed.
Kinetics and Possible Mechanisms of the Ce(IV) Oxidation of EDTA, CDTA, DTPA and NTA in Perchloric Acid Media
Authors: Hanna Samir B. , Cabrroll William R. , Attiga Salem A. , Webb William H.
Published: March 2015

The rates of oxidation of four chelating agents with Ce(IV) in HClO4 solutions, have been studied by the stopped-flow technique. The rates first increase with increasing acidity, reach maxima which are characteristic of the chelating agent and the medium, then progressively decrease with further increasing acid concentration. At their maximum reactivities, the tendencies for oxidation decrease in the following order: trans-1,2-diaminocyclohexane tetraacetic acid (CDTA) > ethylenedinitrilotetraacetic acid (EDTA) > diethylenetriaminepentaacetic acid (DTPA) > nitrilotriacetic acid (NTA). A mechanism for the oxidation of EDTA, involving Ce4+ and Ce(OH)8+ and both unprotonated and monoprotonated chelating agent, is proposed.
Untersuchungen an Chinolacetaten, IV./ Quinol Acetates, IV
Authors: Budzikiewicz H. , Gunawan J.
Published: March 2015

Reaction of 2-acetoxy-cyclohexa-3,5-dienones (“quinol-acetates”) with BF3 or (CH3CO)2O/BF3 in the presence of benzene derivatives (mesitylene, mesitol, 1,3-dimethoxybenzene, 1,3,5-trimethoxybenzene) yields biphenyl and diphenyl methane derivatives. The reasons for their formation are discussed.
Die Komplexbildung der Zitronensäure, I / The Formation of Complexes with Citric Acid, I
Authors: Wiese Günther , Veith Josef A.
Published: March 2015

With a simple mathematical method the three-component-system eH3Ci (citric acid) + fAlCI3 + gNaOH was analysed and the formation of complexes between citrate and aluminium calculated. Mixtures of eH3Ci + fAlCI3, with e/f ratios from 0 to 2.5 were titrated with NaOH. For each titrated mixture which existed of eH3Ci + fAlCI3 the coefficient g(NaOH) was found from the inflection points of the titration curves. When the eH3Ci/fAlCI3 molar ratios were plotted against the corresponding molar ratios of gNaOH/fAlCI3, linear functions were obtained from which the following three dehydrated complexes were calculated :

[Al3OHCi3]⊖ from the first inflection point at pH between 3.0-3.5,

[Al3(OH)4Ci2]⊖ from the 2nd inflection point at pH between 3.8-4.8, and

[Al10(OH)15Ci6]3⊖ from the 3rd inflection point at pH between 5.6-7.5.
Notizen: Neue Derivate des Schwefelhexafluorids. Pentafluorschwefeloxiddifluoridimid F5S-NS(O)F2 und Pentafluorschwefeldimethylamid F5S-N(CH3)2 / New Derivatives of Sulfurhexafluoride. Pentafluorosulfuroxidedifluorideimide F5S-NS(O)F2 and Pentafluorosulfurdimethylamide F6S-N(CH3)2
Authors: Höfer Rainer , Glemser Oskar
Published: March 2015

NSF3 reacts with OSF4 to give F5S-NSOF2 which hydrolyses with alkali to the ion [F5S-NSO2F]-. From NSF2-N(CH3)2 and SF4 or OSF4 only F5S-N(CH3)2 is received together with decomposition products NSF resp. (NSOF)3.
Die Struktur der Phase Na3.7Sn (≈Na15Sn4) / The Crystal Structure of Na3,7Sn (≈Na15Sn4)
Authors: Müller Wiking , Volk Klaus
Published: March 2015

The crystal structure of Na3.7Sn, earlier reported as Na4Sn and Na15Sn4, has been determined. Na3.7Sn crystallizes orthorhombic, space group Pnma - D2h’
16 = 9.82 ± 0.02 Å, b = 5.57 ± 0.01 Å, c = 22.79 ± 0.04 Å. The Sn-atoms are isolated with respect to each other. The packing of atoms is less dense as in Na15Pb4.
Isotopieeffekte in der Grenzschicht anorganischer Lösungen / Isotope Effects at the Surface of Inorganic Solutions
Authors: Heumann Klaus G. , Hoffmann Rainer , Luecke Werner
Published: March 2015

Isotope effects were investigated at the surface of aqueous lithium and calcium salt solutions. The dependence on the temperature in the gas phase was determined. The surfaces of the solutions were isolated by spray experiments. In the case of calcium salt solutions an enrichment of the lighter isotope 40Ca in relation to the heavier isotopes 44Ca and 48Ca was found at the solution surface. The experiments with lithium fluoride and lithium iodide gave inverse isotope effects. The calcium isotope effect could be qualitatively explained by the Gibbs theorem. The isotope separation of lithium possibly can be referred to the more covalent bonding character than the ionic one of lithium compounds at the solution surface.
Zur Reaktion von Azidormamidiniumchlorid mit Triphenylphosphin / The Reaction of Azidoformamidinium Chloride with Triphenylphosphine
Authors: Buder Wolfgang , Schmidt Armin
Published: March 2015

Azidoformamidinium chloride reacts with triphenylphosphine to yield the triphenylphosphine imino azo formamidinium chloride (1). 1 eliminate nitrogen to give triphenylphosphine imino formamidinium chloride (2). The vibrational spectra of 2 is discussed in view of the structure.
Perfluormethyl-Element-Liganden, XI Die Schwingungsspektren von (CF3)2EMn(CO)5 (E=P, As) / Perfluoromethyl Element Ligands, XI. Vibrational Spectra of (CF3)2EMn(CO)5 (E = P, As)
Authors: Demuth Reinhard , Grobe Joseph , Rau Robert
Published: March 2015

The gas phase IR and liquid phase IR and Raman spectra of (CF3)2PMn(CO)5 and (CF3)2AsMn(CO)6 have been recorded. The spectra are assigned on the basis of a normal coordinate analysis using a transferred force field.
Beschreibung der Richtung des elektrischen Dipolmomentvektors 14 durch Slater-Orbitalexponenten, / The Direction of the Electric Dipole Moment Vector μ⃗ as Inferred from Slater Orbital Exponents
Authors: Machmer Paul
Published: March 2015

By means of Slater orbital exponents it is possible to differentiate between the positive and the negative end of the permanent electric dipole of diatomic heteronuclear molecules. Thus Slater orbital exponents hold a clue to the direction of the electric dipole moment vector μ⃗ of the molecular ground state. A comparison with electron population analysis is made.
Reaktionskinetische Untersuchungen zur Bildung von Carbeniumionen des Triphenylmethyl-Typs / Kinetic Investigations of the Formation of Carbenium Ions of the Triphenylmethyl Type
Authors: Walper Matthias , Brauer Hans-Dieter , Kelm Hartwig
Published: March 2015

The rates of formation of three mono- and three dicarbenium ions of the triphenylmethyl type from the corresponding carbinols in trifluoro acetic acid - toluene mixtures were investigated using stopped flow techniques.

The reaction mechanisms are discussed in view of the obtained dependencies of the rate constants on acid concentration and temperature.
Komplexchemie polyfunktioneller Liganden, XXXIV.
Authors: Ellermann Jochen , Geheeb Norbert
Published: March 2015

Octacarbonyldicobalt reacts with the ditertiary phosphine and arsine (C6H5)2-ECH2CH2E(C6H5)2 (E = P, As) in a direct route to give primarily the non CO-bridged, but ligand-bridged complexes Co2(CO)6(C6H5)2ECH2CH2E(C6H5)2. From Co2(CO)6-(C6H5)2PCH2CH2P(C6H5)2 secondarily a CO-bridged isomer has been also isolated. The non-CO-bridged form of Co2(CO)6(C6H5)2PCH2CH2P(C6H5)2 gives insertion reactions with Hg, SnCl2 and CsGeCl3 yielding the probably oligo- or polymeric compounds Hg[Co(CO)3]2(C6H5)2PCH2CH2P(C6H5)2 and Cl2M[Co(CO)3]2(C6H5)2PCH2CH2P(C6H5)2 (M = Sn, Ge). The characteristic IR absorptions of all compounds and some Raman spectra are reported.
Notizen: Photoelectron Spectra and Molecular Properties, XLVI.
Authors: Bergmann Helge , Bock Hans
Published: March 2015

Photoelectron spectra of nitroso compounds X-NO (X = CH3, OCH3) are assigned using chemical relationship and CNDO calculations. Comparison of ionization energies and of calculated charge distributions includes as well derivatives X = N(CH3)2, Cl, F.