bluuebunny/crossref_metadata_2025 huggingface dataset:
Optimierung der oxydativen Spaltung mit MnO4
⊖ / JO4
⊖
Authors: Grimmer Gernot , Jacob Jürgen
Published: March 2015

Es wird eine Optimierung der oxydativen Spaltung von Doppelbindungen mit MnO4
⊖/JO4
⊖ hei Dien- und Trienfettsäuren beschrieben. Erwartungsgemäß zeigte sich, daß die Ausbeute der Hauptreaktion wesentlich von der Reaktionsdauer und der Permanganatmenge abhängt. Unter optimalen Bedingungen findet man 1,5 — 1,7% Überoxydations-Produkte.

Auch die bei der Spaltung entstehende Malonsäure wird zu ca. 90% erfaßt.

Bei der oxydativen ozonolytischen Spaltung von Linol- und Linolensäuremethylester entstehen im Gegensatz zur MnO4
⊖/JO4
⊖.Spaltung neben den Hauptkomponenten weitere nicht identifizierte Produkte.

Die Vorteile der oxydativen Spaltung mit MnO4
⊖/JO4
⊖ liegen in einer einfachen Durchführung, der exakten Dosierbarkeit des Oxydationsmittels und der geringen Überoxydation.
Zum Mechanismus der Induktion nicotinabbauender Enzyme in Artbrobacter oxydans
Authors: Gloger M. , Decker K.
Published: March 2015

Die Induktion der Enzyme Nicotin-oxidase, L-6-Hydroxynicotin-oxidase, D-6-Hydroxynicotinoxidase und Keton-oxidase in Arthrobacter oxydans durch die optischen Antipoden und das Racemat des Nicotins und 6-Hydroxynicotins wurde in Gegenwart einer leicht metabolisierbaren C- und N-Quelle untersucht. Die Induktion der beiden Schlüsselenzyme des Nicotinabbaus, L-6-Hydroxynicotin-oxidase und D-6-Hydroxynicotin-oxidase, erfolgte nicht absolut stereospezifisch durch die optischen Antipoden des Nicotins oder 6-Hydroxynicotins, jedoch stimulierten die D-Antipoden stark die Induktion von D-6-Hydroxynicotin-oxidase. Eine Nicotin- oder eine 6-Hydroxynicotin-racemase ließ sich nicht nachweisen. D,L-6-Amino-nicotin erwies sich als ein schwacher Inducer für die nicotinabbauenden Enzyme in Arthrobacter oxydans.

Während sich aus Wachstumsversuchen eine Koordination für alle vier Enzyme ergab, führte die kinetische Analyse der Induktion zu einer Aufteilung in die Gruppen Nicotin-oxidase, L-6-Hydroxynicotin-oxidase, Keton-oxidase und D-6-Hydroxynicotin-oxidase. Die Induktion wurde durch D-Chloramphenicol und durch Actinomycin C gehemmt.
On Metastable States of Carotenoids in Primary Events of Photosynthesis
Authors: Wolff Ch. , Witt H. T.
Published: March 2015

A repetitive ultra-short-flash photometer is described which can resolve absorption changes of 0,01% in the time range of 10-7 sec. With this instrument the following results have been obtained.

Air-saturated suspensions of photosynthetic systems show light induced absorption changes with a decay time of τ1/2≅ 3·10-6 sec. The properties of absorption changes indicate that they are caused by a metastable state.

The difference spectrum of the changes are characterized by peaks at 430, 460, 490 and 520 nm. No absorption changes are observed in the red region! Therefore the metastable state is formed by carotenoids.

Excitation of chlorophyll sensitizes the formation of the metastable state of the carotenoid. Therefore a transfer of energy from chlorophyll to carotenoid has to be assumed.

The desactivation of the metastable state represents probably an energy valve reaction.
Rise Time of the Light Induced Electrical Field across the Function Membrane of Photosynthesis
Authors: Wolff Ch. , Buchwald H.-E. , Rüppel H. , Witt K. , Witt H. T.
Published: March 2015

A repetitive laser giant pulse photometer is described which can resolve absorption changes of 0.1% in the time range of 10 ns. With this instrument the following results have been obtained.

The rise of the field indicating absorption change in photosynthesis has been measured at 515 nm. The upper limit of the half risetime is about 20 ns. This means that the field formation takes place within this time by a light induced transfer of electrons across the thylakoid membrane.
Charakterisierung von Staphylokokken-Nuclease / Characterization of Staphylococcus Nuclease
Authors: Scharmann W. , Blobel H.
Published: March 2015

Two serologically different nucleases of Staphylococcus aureus were examined. One of these nucleases, the h-Nu, was from S. aureus of human origin, the other, c-Nu, from S. aureus of canine origin.

Both nucleases had a pH optimum of 10.0—10.2 and needed Ca2⊕ for activation. Cu2® was also an effective activator, particularly for c-Nu. Sr2⊕ showed only little activation. Citrate stimulated the activity of h-Nu and inhibited that of c-Nu. Polyvinylsulfate inhibited both nucleases. After heating at 100°C for 2 min. both nucleases (at 0.1 mg enzyme/ml), c-Nu lost 90% and h-Nu 40% of the activity. Both nucleases also split RNA and degraded heat-denatured DNA more rapidly than native DNA.
Study of the Substituent Effect of the Diazonium Group in Chlorobenzenes by 35Cl-NQR
Authors: Pies Wolfgang , Weiss Alarich
Published: March 2015

The NQR spectra of chloroderivatives of benzenediazonium tetrafluoborates have been investigated at 77 K. The temperature dependence of some of the NQR frequencies was measured. The correlation between the NQR frequencies and substituent parameters is pointed out and the strong influence of the inductive effect on the NQR frequencies is discussed. The 2,4,6-trichlorobenzenediazonium tetrafluoborate crystallizes in two modifications as shown by NQR spectroscopy.
Enzymatische Spaltung nativer cystinhaltiger Polypeptide durch Thermolysin (E.S. 3.4.4.) / Enzymatic Hydrolysis of Native Cystine-containing Polypeptides with Thermolysin
Authors: Jentsch Joachim
Published: March 2015

A new method is described for separating cystine peptides from other peptides after hydrolysis of native bovine insulin by the specific protease thermolysin using paper shields instead of column chromatography. The application of this method to sequence determination of other species insulins is possible.

In contrast to the proteolytic fraction (α-protease) from Crotalus atrox venom, thermolysin rapidly hydrolyzes all susceptible peptide bonds in native insulin in high yields. Therefore, the amounts of substrate required to sequence determination are low compared with the known methods involving the denaturation and chemical splitting of polypeptides before proteolysis, such as the mercaptolysis of insulin, carboxymethylation of the A- and B-chain and column chromatography of the reaction products. The yields of the isolated chains are too low for further enzymatic digestion and analysis if the substrate is available only in minimal quantities.

Instead of thermolysin, it is in principle possible to use any other bacterial protease, e. g. subtilisin, but the products of hydrolysis of insulin are easily soluble in water so that the fractionation in soluble and insoluble peptides before isolation is not possible.

Thus, thermolysin is a valuable tool in sequence analysis of cystine-containing polypeptides.
Über Perowskit-Verbindungen vom Typ Ba3MeU2O9
Authors: Kemmler-Sack Sibylle
Published: March 2015

Die Verbindungen Ba3MeU2O9 mit Me = Mg, Mn, Fe, Co, Ni, Zn kristallisieren in einem Perowskitgitter mit Kationenordnung; ihre spektroskopischen Eigenschaften sowie die Ergebnisse der magnetischen Messungen an Ba3MnU2O9 und Ba3FeU2O9 werden mitgeteilt.
Das komplexchemische Verhalten von CF3CSSH gegenüber Metallen niedriger Oxydationsstufe
Authors: Lindner Ekkehard , Langner Detlev
Published: March 2015

Durch Umsetzung von CF3CSSH mit BrMn (CO)5 und BrRe (CO)5 bei 50° in Dimethyläther gemäß

BrM (CO) 5+CF3CSSH → CF3CSSM (CO) 4 + CO + HBr (M = Mn, Re)

gelingt die Darstellung der kovalenten, z. T. sublimierbaren, thermisch und gegen Luftsauerstoff recht stabilen Tetracarbonyl-trifluordithioacetate des Mangans und Rheniums. Die Komplexe werden IR-spektroskopisch charakterisiert, wonach ihnen C2v -Symmetrie zukommt.
Synthese und endgültiger Strukturbeweis von Glucofrangulin A aus Rhamnus frangula L.
Authors: Wagner H. , Hörhammer H. P.
Published: March 2015

Durch Umsetzung eines Gemisches von Frangulin A und B bzw. reinem 1.6.8-Trihydroxy-3methyl-anthrachinon-6-O-α-ʟ-rhamnosid (Frangulin A) mit α-Acetobromglucopyranose nach einer modifizierten Koenigs-Knorr- Methode wurde Glucofrangulin A erhalten und über das Acetat identifiziert. Das synthetische Glucofrangulin-A-Acetat ist in jeder Hinsicht mit dem von SEEBECK und SCHINDLER sowie MÜHLEMANN aus natürlichem Glucofrangulin hergestellten Acetat identisch. Durch NMR-Vergleich mit verschiedenen Anthrachinon-1- bzw. -8-glykosiden wird für das Glucofrangulin A die endgültige Struktur eines 1.6.8-Trihydroxy-3-methyl-anthrachinon-6-O-α-ʟ-rhamnopyranosyl-8-O-β-ᴅ-glucopyranosides bewiesen.
Mechanismus der homogenen katalytischen Hydrierung von Maleinsäuredimethylester mit IrCl(CO)[P(C6H5)3]2
Authors: Strohmeier W. , Onoda Takeru
Published: March 2015

Kinetische Untersuchungen zur homogenen katalytischen Hydrierung von Maleinsäuredimethylester (M) zu Bernsteinsäuredimethylester (MH2) mit dem Katalysator IrCl(CO) [P (C6H5)3] 2 ≡ (IrL2) führten zu dem Ergebnis, daß nicht der Hydridkomplex IrL2H2, sondern der intermediär nach dem folgenden Reaktionsschema

gebildete Komplex IrLM im geschwindigkeitsbestimmenden Schritt den Wasserstoff aufnimmt und auf das Substrat M überträgt.

Die Konstanten K3 und k4 wurden berechnet.
Spektroskopische Untersuchungen an Heteropolysäuren und ihren Ätheraten von Molybdän und Wolfram
Authors: Lange Gertrud , Hahn Harry , Dehnicke Kurt
Published: March 2015

Die IR- und (z. T.) die Raman - Spektren der Heteropolysäuren und ihrer Ätherate vom Typ 12-W-1-X (mit X = B, Si, Ge, P) und 12-Mo-1-X (mit X = Si, Ge, P) werden mitgeteilt. Die Ergebnisse stehen in Einklang mit der Vorstellung tetraedrischer XO4-Zentren und oktaedrischer Umgebung von Molybdän und Wolfram. In den Ätheraten fixieren die Äthermolekeln die Protonen, nicht das gleichfalls anwesende Wasser.
Magnetic Studies with Copper (II) Soaps in Non-aqueous Solutions
Authors: Mehrotra K. N. , Mehta V. P. , Nagar T. N.
Published: March 2015

The dispersion states of copper (II) soaps in non-aqueous solutions have been investigated by the determinations of the magnetic susceptibilities and magnetic moments of copper ions in copper soaps in non-aqueous solvents. The binuclear structure of copper soaps persists in hydrocarbons and in alcohols. The values of magnetic moments of copper ions in copper soaps are higher in hydrocarbons as compared with those in alcohols. The magnetic moments of copper ions in alcohols are independent of the chain length of the soap and of the soap concentration.
Transition Metal Complexes of Ambidinourea and Related Ligands.
Authors: Syamal A.
Published: March 2015

Copper (II), nickel (II), and palladium (II) complexes of amidinourea are reinvestigated in order to verify their structure. Electronic spectra and magnetic susceptibility measurements have been obtained on the solid complexes. Electronic spectral results indicate the donor strength of amidinourea is comparable to strong field ligands like biuret, biguanide, and I-amidino-O-alkylurea. Infra-red spectral results suggest that the carbonyl group of amidinourea is not involved in coordination and the donor atoms in amidinourea are amide nitrogens. The effect of solvents on the absorption bands is also discussed. The solution absorption spectra of bis (amidinourea) copper (II) chloride in different solvents indicate the following order of decreasing tetragonality:

DMSO > methanol > ethyleneglycol > water.
Hemmung des Wachstums von Pilzen und Bakterien durch das Hautdrüsensekret von Salamandra maculosa
Authors: Habermehl Gerhard , Preusser Hans-Jürgen
Published: March 2015

Das Hautdrüsensekret von Salamandra maculosa wirkt wachstumshemmend auf Gram-positive und Gram-negative Bakterien sowie auf Endomyceten. Die Ursache dafür, daß Pilzsporen auf der feuchten Salamanderhaut nicht auskeimen, ist offenbar in der alkalischen Reaktion des Drüsensekrets zu suchen; im Gegensatz zu der bakteriziden Wirkung des Sekrets wurde eine spezifisch fungizide Aktivität nicht beobachtet.
In-vivo-pH-Messungen in Krebs-Mikrometastasen bei optimierter Übersäuerung
Authors: Ardenne M. Von , Reitnauer P. G. , Rohde K. , Westmeyer H.
Published: March 2015

Die Wirksamkeit der Krebs-Mehrschritt-Therapie bei der Metastasenbekämpfung wird in erster Linie von der in vivo in Metastasen bzw. Mikrometastasen (Krebszellzahl NZ ≧ 106) erzielbaren Übersäuerung bestimmt. Die Erkundung dieser Kenngröße gelang durch direkte Messung mit Mikro-pH-Glaselektroden in Mikrometastasen von 0,05 bis 2 mm3 Volumen nach einjährigen Bemühungen. Die Schwierigkeiten des Weges ließen eine Darstellung der Mikro-Glaselektroden-Ent-wicklung, ihrer Bauweise und ihrer Daten notwendig erscheinen (freie pH-sensitive Glasspitze von 80 μm Länge und 10-2 mm2 Meßfläche. Innerer Widerstand 3 ·109 bis 1.5 ·1010Ω. Potentialdifferenz 40 bis 50 mV pro pH-Einheit. I ebensdauer ≈10 bis 14 Tage). Nach Beschreibung der diffizilen Technik zur in-vivo-pH-Messung in optimiert übersäuerten Mikrometastasen sowie der zur Ge winnung bequem erreichbarer Metastasen angewendeten Verfahrensweise wird über pH-Messungen in Mikrometastasen verschiedener Art und Größe sowie mit und ohne Abwartung stationärer Glucose-Milchsäure-Konzentrationen berichtet. Nach Erhöhung der Blutglucose-Konzentration auf 4 ·10-3 g ml-1 und Abwartung stationärer Verhältnisse wurden in Mikrometastasen Werte pH = 6,3 bis 5,9 gefunden. Das sind etwa die gleichen Werte, die von uns bei gleicher Programmierung der i.v.-Glucose-Dauerinfusion in großen Primärtumoren gemessen worden sind. Auf Grund dieser Ergebnisse ist zu erwarten, daß die Doppelattacke Optimierte Tumorübersäurerung+Hyperthermie des Krebs-Mehrschritt-Therapie-Konzeptes auch unter den in Mikrometastasen herrschenden Bedingungen mit nahezu voller Stärke uirksam bleibt.
Darstellung und Kristallstruktur von K2Pd02 / Synthesis and Crystal Structure of K2Pd02
Authors: Sabrowsky Horst , Bronger Welf , Schmitz Dieter
Published: March 2015

The ternary oxide K2PdO2 has been prepared by a reaction between K2O and PdO. X-ray investigations suggest a chain-structure-type which corresponds to that of K2PtS2. The planar oxygen coordinations of the palladium atoms are connected laterally in one dimension. The orthorhombic unit cell (a = 8.523, b = 6.089, c = 3.119 Å) contains two formula units.
Die Kristallstruktur von Ytterbiumdisulfid: YbS2 / The Crystal Structure of Ytterbiumdisulfide: YbS2
Authors: Teske Christoph L.
Published: March 2015

X-ray investigations are described using a single crystal of YbS2 for the first time which formed during a ammono thermal synthesis. It crystallizes in the monoclinic space group C2h
6-C2/c with a = 9,326, b = 4,754, c = 9,025 and β = 118,39°. The atomic parameters and a detailed description of the crystal structure are given. Especially the sulfur-sulfurbridges (dS-S = 2,11 A) represent a characteristic structural element in the a lattice of the genuine disulfide.
Die Struktur von SrCuSn2 und BaCuSn2 und ihre Verwandtschaft zum BiOCl-Gitter / The Structure of SrCuSn2 and BaCuSn2 and its Relationship to the BiOCl-Structure
Authors: May N. , Schäfer H.
Published: March 2015

The compounds SrCuSn2 and BaCuSn2 have been prepared and their crystal structures have been determined. They crystallize in a lattice (space-group Cmcm-D17
2h) related to that of the BiOCl-type.
Darstellung von Trifluorsilylarsan und -phosphan / The Preparation of Trifluorosilylarsine and -phosphine
Authors: Demuth Reinhard
Published: March 2015

A direct synthesis of the compounds F3SiAsH2 and F3SiPH2 (F3SiPD2) by the reaction of F3SiBr with (CH3)3Sn-AsH2 and (CH3)3Sn-PH2 [(CH3)3Sn-PD2] respectively is reported (yield > 70%).

F3SiBr itself was prepared by the cleavage of (C2H5)2N-SiF3 with HBr. NMR data of the compounds is shown.
Die Komplexbildung zwischen Molybdationen und Perjodsäure V / Formation of Complexes Between Molybdations and Periodic Acid V
Authors: Wiese Günther , Böse Doris
Published: March 2015

Heteropolyacids, isomolybdates, dilatometric titrations

By dilatometric titrations and a mathematical analysis of the titrations results the chemism of formation of the heteropolyanion [JMo6O24]5- and its protonation was investigated.
Reactions with 4-Thiohydantoin. Preparation of 5-Arylidene-4-Thiohydantoin, their Reactions towards Grignard Reagents and the Alkylating Agents
Authors: Shalaby A. F. A. , Daboun H. A. , Boghdadi S. S. M.
Published: March 2015

4-Thiohydantoin and 1-phenyl-4-thiohydantoin reacted with aromatic aldehydes to give the corresponding 5-arylidene-4-thiohydantoin (1 a-h). la was obtained also from 5-benzylidene hydantoin and phosphorous pentasulphide. Grignard reagents added to the lateral double bond of (1 a-c) to give after hydrolysis the colorless products 3. Treatment of (1a, b) with alkylating agents gave the corresponding alkylmercapto derivatives (4 a-h). Also (4a, e) were obtained by the action of ethereal diazomethane on (1a, b). By further methylation of (4 e) with diazomethane, a cyclopropane derivative could be isolated.
Zur relativen Stabilität der Siliciumbromidchloride / Studies on the Relative Stability of Siliconbromidechlorides
Authors: Hensen Karl , Fischbach Dieter , Lebert Karl-Heinz
Published: March 2015

The relative stability of the siliconbromidechlorides is discussed on the timedependence of the dismutation reaction of SiCl3Br, on the measured appearence potentials of SiCl3, from SiCl3Br and SiCl4 respectively and on the enthalpies of the hydrolysis reactions. The relative strengths of the Si-Br-bonds of the different compounds were estimated, using SiCl4 as a standard.
KMR-Spektroskopie an paramagnetischen Komplexen, VI / NMR Spectroscopy on Paramagnetic Complexes, VI
Authors: Köhler Frank H.
Published: March 2015

The 13C PFT NMR and 1H CW NMR spectrum of bis(h5-t-butylcyclopentadienyl)vanadium were recorded, and the signals assigned. A distinct superiority of the 13C spectroscopy is shown. As the observability of these signals depends on the line width the influence of the electron-spin relaxation time τe on dipolar and contact broadening is analysed. It is found that both broadenings should be of similar size. Except for the ring carbon atoms of nickelocenes the 13C signals of paramagnetic metallocenes should be easy to observe. Using the 13C results dipolar as well as contact contribution to the experimentally found line width are separated, and τe is determined. From Te it is concluded that zero-field splitting does not essentially affect the electron-spin relaxation.
Über einige Sulfito-kobaltate(III)
Authors: Klement Robert
Published: March 2015

The preparation of Na[Co(SO3)2(NH3)2] · 2 H2O, Na[Co(SO3)2en] · 2 H2O and [Co(NO2)-(SO3)en2] is described. Infrared and visible absorption spectra of the complexes have been measured.
Homoconjugation in Aryl Benzyl Sulphides
Authors: Mancini V. , Piovesana O. , Santini S.
Published: March 2015

The possible occurrence of non classical conjugation involving sulphur in aryl benzyl sulphides has been investigated. From the charge transfer spectra and the stability constants of the complexes formed between iodine and aryl benzyl sulphides, and from the UV spectral behaviour of the ArI–S–CH2–Ar, system, it may be concluded that through space conjugation in aryl benzyl sulphides is not important.
Tribenzo [b.e.h] [1.4.7] trioxacyclononatrien und Tetrabenzo [b.e.h.k] [1.4.7.10] tetroxacyclododecatetraen / Tribenzo [b,e,h] [1,4,7] trioxonin and Tetrabenzo [b,e,h,k] [1,4,7,10] tetroxadodecin
Authors: Weiss Tilman , Schulz Peter , Klar Günter
Published: March 2015

The syntheses of the oligomeric o-phenyleneoxides tribenzo [b, e, h] [ 1, 4, 7] trioxonin and tetrabenzo [b, e, h,k] [ 1, 4, 7, 10] tetroxadodecin are described.
Spectroscopical Investigation of Order-disorder in Some Compounds with Scheelite Structure
Authors: Schipper W. J. , Blasse G.
Published: March 2015

Infrared and Raman spectra have been measured of scheelites with formula ALnW8O8, ALnMo2O8 (A = Li, Na, K; Ln = La, Y), Y2MWO8 M = Ge, Si), Y2GeMoO8 and the zircon Y2SiMoO8 in order to get information about the crystallographic order. The A+ and Ln3+ ions in the scheelites ALnW2O8 and ALnMo2O8 are probably ordered in layers Ln-Ln-A-A perpendicular to the c-axis. The order is short-range only. The degree of order decreases in the sequence K, Na, Li. The compounds Y2MWO8 and Y2GeMoO8 are not ordered, whereas the Si4+ and Mo6+ ions in Y2SiMoO8 are ordered in alternate layers perpendicular to the c-axis. The use of vibrational spectra for the determination of crystallographic order is discussed.
Optisch aktive Übergangsmetall-Komplexe, XXVI.
Authors: Brunner Henri , Lappus Manfred
Published: March 2015

In the reaction of Mn(CO)5Br with the chelating ligand ο-N.N-dimethylaminophenyl diphenyl phosphine (PN) the two enantiomers of fac-Mn(CO)3(PN)Br are formed. Mn(CO)3⁻ (PN)Br interacts with CO/AlCl3 to give the salt [Mn(CO)4(PN)]AlHal4, which can be transformed into [Mn(CO)4(PN)]PF6. The diastereoisomeric compounds Mn(CO)3(PN)COOC10CH19, resulting from the addition of the menthoxide anion to the cation [Mn(CO)4(PN)]+, could not be separated because of their instability. Mn(CO)5Br reacts with the Schiff base NN*, derived from pyridine carbaldehyde(2) and R-α-phenyl ethyl amine, with formation of two isomers of Mn(CO)3(NN*)Br with different configurations at the Mn atom. Both diastereoisomers differ in their 1H NMR spectra and can be obtained in optically active form.
Übergangsmetallkomplexe mit Vinyl- und Cyanpyridinen als Liganden / Transition Metal Complexes with Vinyl- and Cyanopyridines as Ligands
Authors: Biedermann Hans G. , Leeb Eva , Schwarzhans Karl E.
Published: March 2015

A series of complexes formed between transition metal chelates and the ligands vinylpyridine and cyanopyridine has been prepared. By analysis of the IR spectra of the complexes the coordinated ligand atoms were determined.
Complex Formation Between Imidazole and Nickel(II) Salts
Authors: Jansen J. C. , Reedijk J.
Published: March 2015

Coordination compounds of formula Ni(Iz)nX2(H2O)m, in which Iz=imidazole, n = 1, 2, 4, 6, m = 0-4, and X = Cl-, Br-, I- and NCS-, are described. The anhydrous compounds are prepared from ethanolic solutions of Iz and nickel(II) salts in stoichiometric amounts in the presence of the dehydrating agent triethylorthoformate. Without this dehydrating agent hydrates are isolated for n = 2,4 and 6 with X = Cl, Br.

The compounds were identified by means of infrared spectra (4000-25 cm-1), ligand-field spectra (35000-4000 cm-1) and X-ray powder diagrams. Compounds of formula [Ni(Iz)6]X2 all contain octahedrally coordinated Ni2+, for which the spectrochemical parameters were obtained. Tetragonal Ni2+ ions occur in [Ni(Iz)4X2] in which X = Cl and NCS, and in [Ni(Iz)4(H2O)2]X2 in which X = Cl and Br. These compounds are paramagnetic and the crystal-field parameters for tetragonal symmetry have been calculated. In [Ni(Iz)4]X2 with X = I and Br, the Ni2+ ions are square-planar coordinated with anions in the second coordination sphere, resulting in orange-coloured diamagnetic compounds.

Anion-bridged distorted octahedrally coordinated Ni2+ ions probably occur in the compounds of formula Ni(Iz)2X2, in which Iz takes the axial positions. Similar structures are suggested for the mono-imidazole compounds, NiIzX2.
Studies on Ylides: Reactions of N -Pyridinium Phenancylides with α,β-Unsaturated Ketones, I
Authors: Kendurkar Purshottam S. , Tewari Ram S.
Published: March 2015

Reactions of N-pyridinium phenancylides with different a, β-unsaturated ketones give 2,4,6-triarylsubstituted pyridines, 2,6-diphenyl-4-(2-pyridyl) pyridines, 2-benzylidene-4,6-diphenyl pyridines and 2,4,6-triphenyl-3-bromopyridine. Ammonium acetate in acetic acid was used as cyclization agent. The structure of the products are supported by IR and NMR spectra.
Untersuchungen an quartären Pyridinium-Salzen, III / Investigations of Quaternary Pyridinium Salts, III
Authors: Gündel Wolf-Hellmut , Buecher Bodo , Hagedorn Ilse
Published: March 2015

Four molecules of quaternary salts of nicotinamide form a condensation product of structure 2. It has been studied with the model substances 1d—q which elements of structure promote or prevent formation of the cyclocondensation product.
Bis(organosulfinato)-pyridin-Komplexe von Zink(II) / Bis(organosulfinato)pyridine Complexes of Zinc(II)
Authors: Lindner E. , Frembs D. W. R. , Langner D.
Published: March 2015

According to equations (1) and (2) new bis(organosulfinato)mono and bis(pyridine) complexes of zinc with coordination numbers 4, 5 and 6 are described. The structures are discussed pn the basis of the IR spectra of the compounds.
Zur Kristallchemie von Ga2TiO5 / About Ga2TiO5
Authors: Müller-Buschbaum Hk. , Freund H.-R.
Published: March 2015

Single crystals of Ga2TiO5 were prepared and investigated by Xray goniometer data: α = 9.792; b = 9.966; c = 3.597 Å; spacegroup D17
2h-Bbmm. Ga2TiO5 is isotypic with the pseudobrookite structure compounds, and has a statistical distribution of metal positions. The crystal structure stabilizes Ga3+ within distorted octahedral surrounding of oxygen.
Spektroskopische Untersuchungen zum Jahn-Teller-Effekt des Cu2+-Ions in Verbindungen vom Typ A2CuL6, II / Spectroscopic Investigations with Respect to the Jahn-Teller Effect of Cu(II) in Compounds of the Type A2CuL6, II
Authors: Friebel Claus
Published: March 2015

By means of EPR and ligand field spectroscopy a refinement of the Ba2CuF6 structure within the [CuF4/2F2]2--layers consisting of axially elongated CuF6-octahedra, 2-dimensionally connected by corners in an antiferrodistortive order, is given. In qualitative agreement with a recent structure determination by X-ray analysis the spectroscopic data prove, that the equatorial planes of the coupled CuF6-polyhedra form an angle of 2 γ > 90° (corresponding to a disturbed type of antiferrodistortive order). In contrast to 2 γ= 101° found by the X-ray investigation, the spectroscopic results suggest 2 γ = 119 (± 1)°, the consequence of which is an elongation of the Cu—F bond lengths and a remarkable orthorhombic distortion of the CuF6-octahedra.
Die Schwingungsspektren der Silylanionen (SiH3)nSiH⊖
3-n und (SiD3)nSiD⊖
3-n / Vibrational Spectra of the Silyl Anions (SiH3)nSiH⊖
3-n and (SiD3)nSiD⊖
3-n
Authors: Bürger Hans , Eujen Reint
Published: March 2015

The IR and Raman spectra of SiH3
⊖, SiH3SiH2
⊖, (SiH3)2SiH⊖, (SiH3)3Si⊖ and their deuterated derivatives have been recorded in HMPT and HMPT-d18 solutions. Most normal vibrations have been identified. The SiH and SiSi stretching vibrations are considerably lower than for analogous silanes and silylphosphines, ∼ 2050 and 1850-1900 cm-1 being characteristic for SiH3 and SiH⊖
n groups respectively. The assignments are proved by a normal coordinate analysis, and force constants have been calculated. The negative charge is mainly localized on the trivalent Si atom and the lone pair acts repulsively rather than strengthening the SiSi bond through (p→d)π effects.
Stoffwechselprodukte von Mikroorganismen, 141. Mitteilung
Authors: König W. A.
Published: March 2015

A series of C14 to C17 β-ketocarbonic acids could be identified as constituents of stenothricin by chemical degradation, gas chromatography and mass spectrometry.
Notizen: The Role of Copper Ions in Copper Catalyzed Autoxidation of Sulfite
Authors: Veprek-Šiška Josef , Lunák Stanislav
Published: March 2015

Sulfito-cuprous complexes as intermediates of copper catalyzed autoxydation of sulfite and the confrontation with the radical mechanism are described.
Notizen: Hydrolysis, Amide Exchange and Trans-Sulfamylation Reactions of Substituted Sulfamides
Authors: Spillane William J. , Barry James A. , Heaphy William A. , Scott Francis L.
Published: March 2015

Differences in reactivity between tetrasubstituted sulfamides have been probed and compared with the reactivity of other substituted sulfamides. The rearrangement of diarysuflamides has been extended to the heterocyclic class.
Zur Kenntnis der Phase Li13Si4 / On the Phase Li13Si4
Authors: Frank Ursula , Müller Wiking , Schäfer Herbert
Published: March 2015

The crystal structure of Li13Si4, earlier reported as Li7Si2, has been redetermined. Structural relations between Li13Si4, Li7Pb2 and Li3Sb are shown.
Die Kristall- und Molekülstruktur von β -Bromo(2-diäthylaminoäthanolato)kupfer(ll) / The Crystal and Molecular Structure of β-Bromo(2-diethylaminoethanolato)copper(II)
Authors: Mergehenn R. , Merz L. , Haase W.
Published: March 2015

The crystal and molecular structure of β-bromo(diethylaminoethanolato)copper(II) has been determined from three dimensional X-ray diffractometer data. The compound crystallizes in the triclinic space group Pï with one dimer in a unit cell of dimensions α=10.180(II), b=7.999(9), c=6.227(7) Å and a=110.69(4), β=103.12(4), γ=73.82(4)[°]. The structure was refined by least-squares methods using 1944 independent reflexions to give a final R-index of 0,05. The molecule consists of dimeric Cu2O2-units with Cu—O distances of 1.900(4) Å and 1.914(4) A, respectively. The dimers are additional bridged by bromines, so that a “polymeric” structure results; Cu—Br distances are 2.357(2) and 3.660(2) A, respectively. The Cu—Cu distances are 3.003(2) (oxygen bridges) and 4.506(2) Å (bromine bridges).
Die Kristall- und Molekülstrukturen von π-C7Η7Μο(CO)2Cl und π-C7H7Mo(CO)2Br / The Crystal Structures of π-C7Η7Μο(CO)2Cl and π-C7H7Mo(CO)2Br
Authors: Ziegler M. L. , Sasse H. E. , Nuber B.
Published: March 2015

The structures of the title compounds have been determined from three dimensional X-ray data by Patterson and Fourier methods. The crystals of both are orthorombic with the space group D4
2-P 212121. The chloride (2) and the bromide (3) are isomorphous, they have unit cell dimensions a = 642,76 pm, b =1187,27 pm, c =1311,14 pm (2) and 644,59 pm, 1183,78 pm, c = 1321,83 pm (3) and Z = 4. Least squares refinement by use of 1179 (2) and 1037 (3) independent reflections measured on a diffractometer has reached R = 12,5% and R = 7,4% respectively. The molybdenum-bromine bond in 3 is relatively shorter than the molybdenum-chlorine bond in 2, due to greater dπ-dπ interaction.
Über die Koordinationspolymeren M(II) [Pt(CN)6], I Darstellung, Kristallgitter und Lichtabsorptionsspektren / Coordination Polymers M(II) [Pt(CN)6], I Preparation, Crystal Lattice and Absorption Spectra
Authors: Siebert Hans , Weise Manfred
Published: March 2015

Hexacyanoplatinates(IV) M(II) [Pt(CN)6] · x H2O (M(II) = Mg, Ca, Cr, Mn, Fe, Co, Ni, Cu, Zn, Cd; 0 ≦ x ≦ 2) have been prepared. According to their X-ray powder diagrams the compounds crystallize cubic, space group O5
h—Fm3m, Z = 4, with the exception of the Cr and the Cu salt. Due to JAHN-TELLER-distortion of Cr(II) and Cu(II) the latter compounds crystallize tetragonal.

Light absorption spectra of the compounds in the NIR, visible and UV region have been assigned to the d—d transitions of the M(II) electrons in the field of the six N ligands. Crystal field parameters have been determined. In the spectrochemical series, the N atoms of [Pt(CN)6]2— have a position between NH3 and ethylenediamine.

A new simple method to prepare K2[Pt(CN)e] has been developped.
Darstellung von P[P(O)(OR)2]3 / Preparation of P[P(O)(OR)2]3
Authors: Weber Dieter , Fluck Ekkehard
Published: March 2015

By the reaction of PCl3 with dialkylphosphites in the presence of pyridin, compounds of type 2 are obtained, the structure of which is proven by NMR and X-ray photoelectron spectra. Some chemical and physical properties are described.
Zur Kenntnis der Erdalkaliantimonide und -wismutide Sr2Bi, Ba2Sb, Sr5Bi3, Ba5Sb3 und Ba5Bi3 / On the Earth-Alkali-Antimonides and Bismutides Sr2Bi, Ba2Sb, Sr5Bi3, Ba5Sb3 and Ba5Bi3
Authors: Eisenmann Brigitte , Deller Klaus
Published: March 2015

The new compounds Sr2Bi, Ba2Sb, Sr5Bi3, Ba5Sb3 and Ba5Bi3 were prepared and their structures determined. The A2B-compounds crystallize tetragonal bodycentered and are isotypic to Ca2Sb, Ca2Bi and Sr2Sb. The A5B3-compounds build up the Mn5Si3-structure type. In both structures the element (V) atoms are coordinated only to earth alkali atoms.
ESR-spektrometrischer Nachweis des Polysulfidradikalions S3-ESR-spectrometric Proof of the Polysulfide Radical Ion S3
Authors: Seel F. , Güttler H.-J.
Published: March 2015

The signal with g = 2.0280, given by blue colored solutions of polysulfides in dimethylformamide, has been shown through quantitative ESR measurements to arise from the trisulfide radical ion S3-.
Kinetics of Oxidation of Substituted Mandelic Acids by Peroxodisulphate Catalysed by Silver(I) Ions
Authors: Hiran B. L. , Josm S. N. , Bakore G. V.
Published: March 2015

The kinetics of the reaction between peroxodisulphate and p-chloro and p-bromo mandelic acid catalysed by silver(I)ions have been studied. The rate of peroxodisulphate disappearance was found to be dependent (i) on [S2O8
-2] (ii) on [Ag+]. The rate is independent of the substituted acid concentration. Thermodynamic parameters have been evaluated. A mechanism of the oxidation of substituted mandelic acid by peroxodisulphate catalysed by silver(I) has been suggested.
Metal Complexes of Sulphur Nitrogen Chelating Agents, II. 2-Amino Cyclopentene-1-dithiocarboxylic Acid Complexes of Cu(I), Rh(I) and Hg(II)
Authors: Nag K. , Joardar D. S.
Published: March 2015

2-Amino cyclopentene-1-dithiocarboxylic acid (ACDA) reduces Cu(II) and Rh(III) to form univalent complexes of composition Cu(ACDA), 2 H2O and Rh(ACDA) 2 H2O, the oxidised species being a dimer of ACDA. The Cu(I) may be obtained in higher yield by reacting cuprous iodide with ammonium salt of ACDA. A compound of composition Rh(ACDA) (PPh3) (H2O) is obtained by reacting ACDA with Rh(PPh3)3Cl. With Hg(II) a normal bis complex is formed. The compounds have been characterized by their infrared and electronic spectra, magnetic moment measurement and thermal analysis. In the complexes bonding occur through NH2 and deprotonated thiol group. A tentative mechanism for the formation of reduced metal complexes has been suggested.
Notizen: Ternäre Magnesiumverbindungen des Zinks mit 5B-Elementen / Ternary Magnesium Compounds of Zinc with 5B-group Elements
Authors: Mewis Albrecht , Klüfers Peter , Schuster Hans-Uwe
Published: March 2015

By investigations in the systems Mg—Zn—P (As) we found two ternary phases of the formulas Mg1, 75Zn1, 25P2 and Mg2ZnAs2, which crystallize in a trigonal lattice. We suppose a modified anti-La2O3-type structure.
Notizen: Neue Synthese von N-Phosphoranyliden-schwefelsäureamiden, -schwefelsäurealkylesteramiden, -fluorschwefelsäureamid und -methansulfonsäureamid, II / New Synthesis of N-phosphoranylidene-sulfuric Acid Amides, -sulfuric Acid Alkylester Amides, -fluorosulfuric Acid Amide and -alkylsulfonamide, II
Authors: Appel Rolf , Einig Heinz
Published: March 2015

By reaction of triphenylphosphine and carbon tetrachloride with methane sulfonamide (1 a) and the sulfamic acid derivatives (1 b-g) N-triphenylphosphoranylidene compounds of these substances could be obtained.
Reaktionen mit monosilylierten Schwefel- und Carbodiimidenl / Reactions of Monosilylated Sulfur- and Carbodiimides
Authors: Appel Rolf , Montenarh Mathias
Published: March 2015

Aminomercapto-sulfur- and -carbodiimides (4a-d) can be obtained by the reaction of monosilylated sulfur- and carbodiimides (1 a, b) with aminosulfenic acid chlorides, 1 a, b react with dimethyl-dichlorosilane to give the silazanes (7a, b); with dichloro-sulfane the sulfurdiimido- and carbodiimido-sulfanes (2 a, b) are formed.
Darstellung und Kristallstruktur von LiAg3O2 / Preparation and Crystal Structure of LiAg3O2
Authors: Jansen Martin
Published: March 2015

The new oxide LiAg3O2 was prepared using oxygen pressures of about 300 at. The crystal structure, determined by single crystal X-ray investigations, consists of branched O—Ag—O—Ag chains; Li is coordinated by distorted, edge-sharing oxygen tetrahedra. The space group is Ibam; α = 5.974 Å, b = 9.945 Å, c = 5,694 Å.
N-(2-Chlordisilanyl)-triorganophosphinimine / N-(2-Chlorodisilanyl)-triorganophosphine Imines
Authors: Wolfsberger Werner
Published: March 2015

Several N-(2-chlorodisilanyl)-triorganophosphine imines have been prepared and characterized by elemental and spectral analysis.
Komplexchemie polyfunktioneller Liganden, XXXV Das Reaktionsverhalten von Co2(CO)8 gegenüber dem tritertiären Phosphin 1.1.1-Tris(diphenylphosphinomethyl)äthan / Complex Chemistry of Polyfunctional Ligands, XXXV Reaction of Co2(CO)8 with the Tritertiary Phosphine 1,1,1-Tris(diphenylphosphinomethyl)ethane
Authors: Ellermann Jochen , Schindler Joachim F.
Published: March 2015

Octacarbonyldicobalt reacts with the tritertiary phosphine 1,1,1-tris(diphenylphosphinomethyl)ethane (TDPME) to give the ionic complex [Co(CO)2TDPME][Co(CO)4]. Treatment of [Co(CO)2TDPME][Co(CO)4] with Na[B(C6H5)4], HClO4 and CH3J yields the cobalt(I)-salts [Co(CO)2TDPME]X [X == B(C6H5)4, ClO4, J]. With CH3J, [Co(CO)2TDPME]J can also be converted to Co(CO)2(J)(R2PCH2)2C(CH3)[CH2PR2CH3
+]J-in which TDPME is acting as a bidentate ligand. [Co(CO)2TDPME]ClO4 forms with KCN the non ionic compound Co(CN)(CO)(TPDME). The IR spectra of all compounds between 2100 and 400 cm-1 are reported. Based on Raman polarization data a tetragonal pyramid has been proposed for the five-coordinated cobalt(I) in the cation [Co(CO)2TDPME]+.
Über eine notwendige Präzisierung der Definition des Isosterie-Begriffs / Restatement of the Definition of Isosterism with Respect to Excited Species
Authors: Machmer Paul
Published: March 2015

The current definitions of isosterism are incomplete if excited species are considered; here any reasonable definition must include the specification of the valence state too. Implications of this are discussed. A criterion for the selection of consistent valence state energies is developed.
NOTIZEN: Bildung und Reaktion Si-fluorierter 1.3.5-Trisila-cyclohexane / Formation and Reactions of Si-fluorinated 1,3,5-Trisilacyclohexanes
Authors: Fritz G. , Portner M.
Published: March 2015

The reaction of 1,3,5-Trisilacyclohexanes containing Si—F and C—Cl groups and CH3MgCl starts with methylation of the Si—F group (in contrast to the reactions of the corresponding Si—Cl containing derivatives). At a certain degree of methylation a ring contraction starts at the C—Cl group.
Dialkylindiummono- und Alkylindiumdihalogenide R2InX und RInX2 (mit R=CH3, C2H5 und X=Cl, Br, J), II./ Dialkyl Indium Mono- and Alkyl Indium Dihalogenides R2InX and RInX2 (with R=CH3, C2H5 and X=Cl, Br, J), II.
Authors: Mertz Klaus , Schwarz Wolfgang , Zettler Frowin , Hausen Hans-Dieter
Published: March 2015

Methylindium-dichlorid kristallisiert in der tetragonalen Raumgruppe I4̅ mit den Gitterkonstanten a = b =13.628 Å und c = 6.333 Å. Die Elementarzelle enthält acht Formeleinheiten. Indium ist in starker Verzerrung trigonalbipyramidal von einem Kohlenstoffatom (der Methylgruppe) und vier Chloratomen (mit deutlich verschiedenen In–Cl-Abständen) umgeben.
Trifluormethyldisulfan / Trifluoromethyldisulfane
Authors: Gombler W. , Seel F.
Published: March 2015

The reaction of trifluoromethylchlorosulfane with an excess of hydrogensulfide yields trifluoromethyldisulfane. The new compound has been characterised by its IR, Raman, 19F and 1H NMR, UV and mass spectrum, melting and boiling point and by vapour pressure data. The result of some chemical reactions are reported. Furthermore, previously unreported NMR and mass spectral data of CF3SH, CF3S3CF3 and CF3S4CF3 are given.
Spektroskopische Untersuchungen, IX./Spectroscopic Investigations, IX.
Authors: Martens Jürgen , Praefcke Klaus , Schwarz Helmut
Published: March 2015

The mass-spectrometric investigation of esters and thiolesters of benzoic, thiobenzoic, salicylic and thiosalicylic esters shows that an analytical distinction with aid of the ortho effect is only possible under certain conditions between 1,2-disubstituted aromatic compounds and the other constitutional isomers. Absent or small intensive signals of rearrangement-ions do not exclude such a constitution. The apparent anomalous behaviour of the S-methyl, S-tolyl and O-tolyl esters is rationalized by energy considerations. The influence of the enthalpy of formation of the neutral particles on the product distribution (α-cleavage/ortho effect) is discussed.
Notizen: Zur Kristallstruktur von SrPbO3 / The Crystal Structure of SrPbO3
Authors: Keller Hans-L. , Meier Karl-H. , Müller-Buschbaum Hk.
Published: March 2015

Single crystals of SrPbO3 could be prepared by oxygen-high-pressure-synthesis (PO2 > 3500 at, t = 450°C). Single crystal X-ray diffraction data confirm the space group D2h
16-Pnma. SrPbO3 belongs to the orthorhombic distorted Perowskit type with a = 5.964, b = 8.320, c = 5.860 Å. The atomic positions were refined.
Notizen: Ermittlung von SS-Kernabständen aus Schwingungsspektren / Determination of SS Bond Distances from Vibrational Spectra
Authors: Steudel Ralf
Published: March 2015

Linear relationships have been established between SS bond distances and both SS force constants and SS stretching frequencies. Bond distances are derived for S2
–, S3
–, and S4 2+.
Notizen: Pyridin-2-thiolato-komplexe des Kupfer(I) und Kobalt(III) / Pyridine-2-thiolato Complexes of Copper(I) and Cobalt(III)
Authors: Lenhart Norbert , Singer Hellmut
Published: March 2015

Pyridine-2-thiolato complexes of copper(I) and cobalt (III) have been prepared from copper(II)- and cobalt(III)-acetylacetonate with pyridine-2-thiol as well as by reacting CuCl(pyridine-2-thiol)3 and CoCl2-(pyridine-2-thiol)2 with a base. The copper(I) complex forms an addition product of low stability with triphenylphosphine. The cobalt complex is monomeric whereas according to its mass spectrum pyridine-2-thiolato-copper(I) appears to be tetrameric.
Über die Umsetzung von Alkylaziden mit Nitrosylchlorid und Antimon(V)-chlorid / The Reaction of Alkyl Azides with Nitrosyl Chloride and Antimony(V) Chloride
Authors: Volgnandt Peter , Schmidt Armin
Published: March 2015

Methyl azide reacts with nitrosyl hexachloroantimonate(V) according to the conditions to yield nitrogen, dinitrogen oxide and methyl chloride or N-methylmethylenimonium hexachloroantimonate(V) (1). Independant of the conditions ethyl or isopropyl azide give 1:1-compounds of the azides with antimony(V) chloride and ethylidene or isopropylideneimonium hexachloroantimonate(V) (2) or (8).
Polyphosphatovanadate / Polyphosphatovanadates
Authors: Preuss Fritz , Schug Heinrich
Published: March 2015

Yellow phosphatovanadates M2O · V2O5 · P2O5 · H2O (M = K, Rb, Cs, NH4), 2 K2O · V2O5 · P2O5 and M2O · 2 V2O5 · P2O5 · aq (M = K, Rb, NH4) are prepared; their properties studied by chemical reactions, 1H NMR and IR spectroscopy indicate a polymeric constitution of these compounds. No polyphosphatovanadic acid can be isolated; condensation reactions in highly acidified sodium metavanadate solutions, containing an excess of sodium dihydrogenphosphate, yield polymeric oxide hydrate VPO5 · 2 H2O.
Beiträge zur Chemie des Phosphors, 60 Zur Kenntnis des α-Tetraphosphor-trithio-dijodids / Contributions to the Chemistry of Phosphorus, 60 About α-Tetraphosphorus-trithio-diiodide
Authors: Baudler Marianne , Kloth Bernhard , Koch Dieter , Tolls Elmar
Published: March 2015

The ‘broad single line’ at —127 ppm (from 85% H3PO4), reported in the literature for the 31P NMR spectrum of α-P4S3J2, could be resolved into 10 lines which form together with also detected outer signals of low intensity an AA′BB′ system with 24 observable lines. Therefore, α-P4S3J2 has the same bicyclic molecular structure 1 in solution as in the solid state. The chemical shifts of the atoms PA and PB, determined by analysis of the spectrum, have the very small difference of 3.68 ppm, which may be caused by an accidental compensation of substituent and ring tension effects. The infrared spectrum of α-P4S3J2 is consistent with formula 1 too.
Polarographic Study of the Electrode Reaction of Zn(II) in Formamide and Dimethylformamide
Authors: Sharma Sudhindra Swarup , Singh Mukhtar
Published: March 2015

The reduction of Zn(II) at the d.m.e. has been studied in aqueous mixtures of formamide and dimethylformamide. The general polarographic characteristics have been determined, using 0.1 M NaNO3 as the supporting electrolyte. The reduction of Zn(II) in these organic solvents is irreversible and diffusion controlled. The kinetic parameters, αna and kf,h have been calculated separately by KOTECKY and DELAHAY treatments. The change of polarographic characteristics and kinetic parameters is explained in terms of solvation of the metal ion in these solvents. The electrocapillary curves in the presence of these solvents have also been studied.
Reactions with 5-Substituted-1,3-thiazolidine-2,4-dithiones Heterodiene Syntheses
Authors: Kassab Nazmi Abd El Latif , Allah Sanaa Osman Abd , Ead Hamed Abd El Reheem
Published: March 2015

The arylidene derivatives (1) of 1,3-thiazolidine-2,4-dithione undergo 1,4-cycloaddition reaction with acrylonitrile, ethyl acrylate, ω-nitrostyrene, styryl ethyl ketone and N-aryl-maleimides leading to substituted tetrahydrothiopyrano-7 H[2,3-d]thiazole-2thiones (2), (8) and (4).

Grignard reagents effects addition to the double bond of the lateral chain of 1 to yield products proved to have structure 7.
Notizen: Magnetische Untersuchungen an ternären Chrom(III)-fluoriden ACrF4 / Magnetic Investigations of Ternary Chromium(III)-fluorides ACrF4
Authors: Knoke G. , Babel D.
Published: March 2015

Powder susceptibilities in the temperature range 4.2 to 295°K are reported for the antiferromagnetic compounds ACrF4 (A=Na, K, Rb, Cs, Tl) and K2Cr5F17.
Notizen: Katalytische Hydrierung ungesättigter Verbindungen mit H2PtCl6-SnCl2 · 2 H2O in Essigsäure / Catalytic Hydrogenation of Unsaturated Compounds with H2PtCl6-SnCl2 · 2 H2O in Acetic Acid
Authors: Strohmeier Walter , Pföhler Magdalena
Published: March 2015

A hydrogenation catalyst, operating under mild conditions can be prepared by dissolving H2PtCl6 and SnCl2 · 2 H2O in acetic acid. After injection of an unsaturated compound under a H2-atmosphere the active moiety of the catalyst is generated. No active moiety of catalyst is formed if the compound has a triple bond. But acetylenic derivatives are hydrogenated if the active moiety of the catalyst is first produced by hydrogenation of cyclohexene.
Über Isopolymolybdatfeststoffe und deren Beziehung zu Isopolymolybdationen in wäßriger Lösung / Concerning Solid Isopolymolybdates and their Relation to Isopolymolybdate Ions in Aqueous Solution
Authors: Tytko Karl-Heinz , Schönfeld Bernd
Published: March 2015

After a brief discussion on the output capacity of the methods used for the study of the isopolymetalates, a classification and characterization of the solid isopolymolybdates obtainable from aqueous solution is given, and the relation of the solid isopolymolybdates to the isopolymolybdate ions in solution is studied. A correlation between the occurrence or non-occurrence of a species in a solid and in its solution detectable by Raman spectroscopy, the solubility of the solid, and the time necessary for the formation of the solid was found. This gives important informations on the mechanisms of formation of the isopolymetalate ions. The most remarkable result of this investigation is that contrary to the view of the majority of the papers on this subject the octamolybdate ion Mo8O26
4- having the structure found by LINDQVIST does not occur in important quantities in solution at room temperature. For setting up a reaction scheme on the isopolymolybdates only very few of the confusing multiplicity of the papers give evidentiary informations. Most of the papers are overinterpreted.
Die Kristallstruktur von CsGaS2 / The Crystal Structure of CsGaS2
Authors: Schmitz Dieter , Bronger Welf
Published: March 2015

Colourless needles of the compound CsGaS2 were obtained by the reaction of cesium carbonate with gallium oxide at 850°C under a stream of H2S. Structural investigations of (100) twinned crystals revealed an atomic arrangement isotypical with RbFeS2. Space group C2/c; a = 7.425(6) Å, b = 12.21(1) Å, c = 5.907(6) Å, β = 113.1(1)°; z = 4. The structural similarities between alkalithiogallates and -ferrates can be utilized in studying the magnetic interactions between the iron atoms within the sequence of mixed crystals of AFe1-xGaxS2 (A ≙ alkali metal).