bluuebunny/crossref_metadata_2025 huggingface dataset:
Mikrowellenspektrum, interne Rotation, Struktur und Dipolmoment von Methylchloroform
Authors: Holm R. , Mitzlaff M. , Hartmann H.
Published: March 2015

The microwave spectrum of several symmetric and asymmetric top isotopic species of CH3CCl3 has been studied in the region from 8 to 40 GHz. A least squares analysis of the rotational con-stants gave the following structural parameters :

dC-C =(1.541 ±0.001) A, dC-Cl = (1,7712 ± 0.0008) A, dC-H = (1.090 ± 0.002) A, ∢H—C—H= (110.04±0.25) ° , ∢Cl—C—Cl= (109.39 ±0.25) ° .

A dipole moment of μ = (1.755 ± 0.015) D has been derived from the investigation of the Stark effect of the transition J=4→5 of CH3CCl3
3
35. From intensity measurements the barrier to internal rotation is estimated to be (1740 ± 300) cal/mol. An analysis of the spectrum of CH2DCCl2Cl37 shows conclusively that methylchloroform in its equilibrium configuration has the methyl group staggered with respect to the CCl3-group. It could be shown that there exist two torsional isomers gauche and anti with specific microwave spectra.
Zur Berechnung von mittleren Schwingungsamplituden
Authors: Müller A. , Krebs B. , Peacock C. J.
Published: March 2015

Some rules for mean amplitudes of vibration u are given. It is shown that the u values for bonded atoms can be calculated by a simple formula needing only stretching force constants and atomic masses. The values obtained for a number of XY3(C3v) and XY4(Td) molecules show generally less than 5% difference from the rigorously calculated ones. The data published in the literature are often several times too large. For the XY3(C3v) molecules a normal coordinate analysis in a M.V.F.F. approximation is given. From a new simple L matrix approximation method mean amplitudes of vibration have been calculated for these species which also agree very well with rigorously calculated ones.
EPR-Untersuchung der g-Faktoren und Chlor-Hyperfeinstrukturen von gelösten aliphatischen Radikalen
Authors: Möbius K. , Hoffmann K. , Plato M.
Published: March 2015

For a series of alkyl radicals we have measured the electron g factors and hfs splitting constants by EPR methods. The isotropic chlorine hfs constants are discussed in terms of the Karplus-Fraenkel formula αCl=QCCl
Cl
Qc. The results indicate that QCl = Δ (Cl) QC
π with Δ (Cl) =0.16. From this and Fischer’s Δ (Xi) parameters for the other substituents, effective σ-π-parameters could be determined to be

There exists a proportional relationship between the g factor shift ΔgCl due to chlorine substituents and Cl
Σ QCl
π from which ΔEn→π
Cl =15.6·103 cm-1 was determined. CI
Zur Thermodynamik der Strukturumwandlungen
Authors: Schubert K.
Published: March 2015

The classification of the structure transformations may be improved by considering the phenomena of long range order and short range order. The Lambda transformations and the phase transformations are distinguished from one another in that certain entropie values which may be found by extrapolation are bigger or smaller than the latent entropy. Transformations of the second order are to be considered as improbable limiting cases.
Optische Anregung beim Ladungsaustausch von Ne+-Ionen mit den Molekülen N2, O2 und CO2 bei Energien unterhalb 250 eVolt
Authors: Schlumbohm H.
Published: March 2015

An experimental investigation of the light emission being excited by charge transfer collisions between ground level Ne+-ions and molecules of N2, O2, and CO2 at collisional energies up to 250 eVolts has shown optical excitation of the molecular ions being formed. The spectral scannings show the main system of N2
+ and mainly the first negative system of O2
+. Thus N2
+ is formed in the excited B2Σu
+-levels and O2
+ in the b4Σg
-- and to a smaller amount in the A2Πu-levels. Both reactions approach energy resonance within 1 to 3 eVolts as far as it is possible following the Franck-Condon principle. The spectral scanniings measured with CO2 as the target molecule indicate that at almost equal rates CO2
+ is formed in the Ã2IIu-levels and by dissociative charge transfer CO+ in the upper A2II-levels of the observed comet-tail bands. The energy balance of this dissociative reaction is endothermic within 2,1 eVolts. — The cross sections for the excitation of definite vibrational bands of CO2
+, CO+, and N2
+ show threshold energies of several eVolts. After a primary increase the cross sections remain constant over the total energy range up to 250 eVolts. Only for the excitation of N2
+ a broad maximum between 20 and 30 eVolts was found.
Notizen: On the Nature of the N1 Center in KCl
Authors: Lehmann Gerhard
Published: March 2015

Evidence is presented to show that the N1 absorption band in additively colored KCl is identical with the R+ band of SCHNEIDER and RABIN. Formation of this center gives an explanation for the low thermal stability of R centers. Thermal stability and mechanisms of formation and destruction of such ionized centers are discussed. Equivalent centers are postulated in other alkali halides. In KBr the reported positions of N1 and R+ bands are almost identical.
Röntgenographische Untersuchungen an aufgedampften Nickelfilmen
Authors: Wedler G. , Wissmann P.
Published: March 2015

Nickelfilme im Schichtdickenbereich von 100 bis 4000 Å werden unter Ultrahochvakuumbedingungen bei 77°K auf Tempaxglasträger aufgedampft, bei 210°C getempert und anschließend an der Atmosphäre bei 20°C röntgenographisch untersucht.

Eine Auswertung bezüglich der Reflexbreiten sowie der Winkellage der Reflexmaxima zeigt, daß die Filme keine merklichen Stapelfehler enthalten. Die {111}-orientierten Kristallite sind stets größer als die {200}- und die {311}-orientierten. Die mittlere Größe der {111}-orientierten Kristallite entspricht dabei etwa der Schichtdicke. Die für die Filme gemessenen Gitterkonstanten sind gegenüber denen des kompakten Materials erniedrigt. Dieser Effekt beruht auf einer Kontraktion des Gitters in der Richtung senkrecht zur Filmebene unter dem Einfluß der unterschiedlichen thermischen Ausdehnungskoeffizienten von Film und Unterlage. Das Ausmaß der Gitterkontraktion hängt von der Schichtdicke ab.
Rotational Angular Momentum Dependence of the Scattering Amplitude for Elastic Molecular Collisions
Authors: Hess S. , Köhler W. E.
Published: March 2015

The rotational angular momentum (spin) dependence of the binary scattering amplitude operator is investigated for elastic collisions of homonuclear diatomic molecules with monatomic and diatomic particles. Starting point is a formal expansion of the T-matrix (and consequently of the scattering amplitude) with respect to the nonsphericity parameter ε which essentially measures the ratio of the nonspherical and spherical parts of the interaction potential. A transscription of angle dependent potential functions into a spin operator notation is introduced. Potential functions and values for ε may be inferred from the data available in the literature for the interactions: H2—He (ε ≈ 1/4) and H2—H2 (ε ≈ 1/20). As far as elastic events are concerned, irreducible spin tensors of even rank only occur with the interaction potential and consequently with the scattering amplitude in order ε. The most important terms of the scattering amplitude of diatomic molecules are quadratic in the spins. These terms are discussed in detail. In order ε2 the scattering amplitude also contains irreducible spin tensors of odd rank. A knowledge of the orders of magnitude of the various spin — dependent terms is of interest for the SENFTLEBEN-BEENAKKER effect and for NMR in polyatomic gases.
Optical Nuclear Polarization by Selective Population of Nuclear Substates
Authors: Colpa J. P. , Hausser K. H. , Stehlik D.
Published: March 2015

The symmetry selection rules for the mixing of states by spin orbit interaction are known to cause unequal population of the three electronic levels of excited triplet states in aromatic molecules. It is shown here that the same selection rules, when combined with the hyperfine interaction, can also produce a selective population and depopulation of the nuclear sublevels. This mechanism is proposed to be responsible for the large optical nuclear polarisation (ONP) in low fields observed experimentally.
Nuclear Spin Relaxation by Defect Mechanisms of Self-Diffusion in Crystals
Authors: Wolf D.
Published: March 2015

The present paper shows how to incorporate the correlation between successive nuclear jumps, which are well known to play a role in defect mechanisms of self-diffusion in crystals, into the calculation of the correlation functions describing the temperature dependence of the nuclear spin relaxation in solids. The treatment is based on an extension of Torrey’s theory of nuclear spin relaxation by randomly migrating nuclei. Explicit and detailed results are given for the monovacancy mechanisms of self-diffusion in an isotopically pure face-centred cubic crystal.
Evaluation of Boltzmann Integrals for Inelastic Collision and Radiative Processes in Monatomic Plasmas
Authors: Claassen H. A.
Published: March 2015

Within the scope of a moment method collision integrals of the Boltzmann type are formulated and evaluated for the different excited particle states of a stationary monatomic plasma macroscopically at rest. All collision and radiative processes except the three body recombination are considered. The calculations are performed within Grad’s 8-moment approximation of the momentum distribution functions of the material particle components. Assuming axial symmetry of the differential collision cross sections the evaluation leads to linear functions of generalized Chapman-Cowling integrals for binary inelastic particle interactions and to Einstein and photoionization coefficients for the radiative processes. Simplifications are given in special and limiting cases.
Konstitution und Wirkung biologisch aktiver Verbindungen
Authors: Perkow Werner
Published: March 2015

Als „biologisch aktive Zentren“ werden bei weiteren chlorierten Kohlenwasserstoffen und anderen phosphorfreien Insektiziden wiederum Kohlenstoffatome mit charakteristisch verminderter Elektronendichte für die Wechselwirkung mit Fermenten verantwortlich gemacht. Das gleiche Wirkungsprinzip tritt auch in anderen Verbindungsklassen auf.
Eine hochempfindliche, trägheitsfreie y - Retina zur bildlidien Erfassung der Bewegung radioaktiver Substanzen, insbesondere in biologisdien Objekten
Authors: Fucks Wilhelm , Schumacher Gerd , Scheidweiler Andreas
Published: March 2015

Zur Untersuchung der Bewegung von y-strahlender Materie in unzugänglichen Raumbereichen, etwa im Innern des tierischen oder menschlichen Körpers wurde eine hochempfindliche, trägheitsfreie y-Retina entwickelt. Sie erlaubt den Ubergang vom Radiophotogra mm zum Radiofilm. Im Vergleich zu der früher beschriebenen y-Retina ist die Empfindlichkeit auf das Tausendfache gesteigert. Das zeitliche Auflösungsvermögen wurde soweit gesteigert, daß für medizinische Zwecke die Apparatur als trägheitsfrei angesehen werden kann. An Hand zahlreicher Versuche wurden die physikalischen Daten des Geräts ermittelt
Notizen: Zum zeitlichen Gang der Oberflächenspannung wässeriger und nicht-wässeriger Systeme
Authors: Signer R. , Berneis K.
Published: March 2015

Bisher wurde die Veränderung der Oberflächenspannung mit dem Alter der frisch gebildeten Oberfläche vor allem an wässerigen Lösungen typischer Netzmittel untersucht. In der vorliegenden Arbeit wird gezeigt, daß auch nicht-wässerige Systeme einen ausgeprägten zeitlichen Gang der Oberflächenspannung aufweisen können. Dabei werden, je nach System, Effekte verschiedener Größenordnung erhalten. Die Ergebnisse entsprechen der von BARTHOLOME und SCHÄFER1 aufgestellten Beziehung über den zeitlichen Verlauf der Oberflächenspannung wässeriger Netzmittel.
Histochemische und polarisationsoptische Untersuchungen an ultraviolett-bestrahlter Haut
Authors: Hanke W .
Published: March 2015

Untersuchungen an uv-bestrahlten Schwimmhäuten von Fröschen und Rückenhäuten von Mäusen ergaben, daß mit Hilfe der Nadi - Reaktion (GRÄFF) Oxydationspotentiale an der Bestrahlungsstelle nachgewiesen werden können. Kurzwelliges UV unter λ = 300 mμ hat hierbei die beste Wirkung. Die Stellen stärkster Oxydationskraft liegen bei Schwimmhäuten an den Melanophoren des Corium, bei Mäuserücken-Häuten verteilt im Corium. Bei den Froschhäuten kann zusätzlich bei unphysiologischem pH 4,2 Oxydationswirkung in der Epidermis nachgewiesen werden. Strukturelle Veränderungen an der Schwimmhaut werden polarisationsoptisch deutlich.
Artefakte in elektronenmikroskopischen Präparaten
Authors: Menke Wilhelm
Published: March 2015

Blättchen von Elodea densa, mit Osmiumtetroxyd fixiert und in Plexiglas eingebettet, zeigen im Mittel eine Abnahme der Chloroplastendicke von 43 Prozent; der Durchmesser der Chloroplasten dagegen nimmt nur um 7% ab. Die verhältnismäßig starke Dickenabnahme führt erst zur Bildung durchgehender Stapel von Granalamellen, die daher Artefakte sind.
Cytochrom-c aus Bombyx mori
Authors: Tuppy Hans
Published: March 2015

In Fortführung einer vergleichenden Untersuchung über Cytochrom-c verschiedener Herkunft wurde eine einfache Methode zu seiner Gewinnung aus Faltern des Seidenspinners Bombyx mori entwickelt. Das Bombyx-Cytochrom-c ist chemisch, spektrophotometrisch und enzymatisch den aus Vertebraten dargestellten Cytochromen äußerst ähnlich. Die Struktur eines aus ihm durch Abbau mit Pepsin gewonnenen Hämopeptids unterscheidet sich von der Struktur des entsprechenden Abbauprodukts von Rinder-Cytochrom-c nur dadurch, daß in der aus elf Aminosäureresten zusammengesetzten Polypeptidkette ein Arginin- an Stelle eines Lysin-Restes steht.
Nuclear Magnetic Resonance Studies on Fluorides of Trivalent Phosphorus
Authors: Reddy G. S. , Schmutzler R.
Published: March 2015

The P31, F19, and H1 nuclear magnetic resonance spectra of a new series of compounds of the types (RO)nPF3-n and (R2N)nPF3-n (n = 1,2) have been studied. A regular change in the chemical shifts and coupling constants has been observed with multiple substitution. The changes in the coupling constants have been explained on the basis of the electronegativity of the atoms attached to phosphorus. Some long-range coupling constants between hydrogen and fluorine separated by five bonds were observed.
Effect of substitution on the stabilities of copper chelates of Hydroxytriazenes
Authors: Purohit D. N. , Sogani N. C.
Published: March 2015

The effect of substituting -Cl, -Br, -CH3 , -NHCOCH3, -COOH, -COCH3, -OCH3, and -SO3
⊖ groups on the molecule of 3-hydroxy-1.3-diphenyltriazene upon the stabilities of copper chelates of substituted hydroxytriazenes has been discussed.

An attempt has been made to correlate the pKa values of ligands with the first step and overall stability constants of copper chelates formed by them.
Kreuzreaktionen von Antiseren gegen heterologe terminale Aminosäuresequenzen und zwei Stämmen des Tabakmosaikvirus
Authors: Anderer F. Alfred , Schlumberger Horst-Dieter
Published: March 2015

Artifical antigens with the peptides Pro-Ala-SerOH, Ala-Pro-Ala-ThrOH and Ser-Ala-Pro-Ala-ThrOH were prepared. The cross-reactivity and the neutralizing capacity of the corresponding antisera were tested with TMV-strain Vulgare and strain Dahlemense.

Antisera against homologous terminal sequences show the same neutralizing capacity for the virus as antisera against the intact virus. Structural changes of 1 — 2 Å units in the terminal residues of the haptenic groups of the artificial antigens diminish the neutralizing capacity of the corresponding antisera for the virus. Structural changes in non-terminal residues (the fourth position from the end) do not significantly diminish the neutralizing capacity of the corresponding antisera when tested with TMV-strain Vulgare and strain Dahlemense.
Lichtabhängige, anisotrope Veränderungen des Chloroplastenvolumens in lebenden Zellen
Authors: Hilgenheger Hedwig , Menke Wilhelm
Published: March 2015

Like isolated chloroplasts, the volume of chloroplasts in living cells of Nitella flexilis decreases reversibly with illumination. This process was recorded by flashlight photography in the same cell and with the same chloroplast. These changes of volume are anisotropic and are caused by a decrease of the chloroplast thickness. The degree of shrinkage depends upon the age of the cells. A dependence of the light intensity was demonstrated. The correlation between fine structure of Nitella chloroplasts and of swelling and shrinkage phenomenon is discussed.
Einfluß von Röntgenstrahlen auf Chloroplasten-Reaktionen und der Schutzeffekt von Ascorbat
Authors: Jacobi Günter
Published: March 2015

Intact isolated chloroplasts were irradiated with X-rays and tested for the inactivation of oxygen evolution, ATP-formation and photoreduction of NADP. In accordance with results published previously phosphorylation is the most sensitive process influenced by X-rays. In presence of ascorbate ever, phosphorylation is partly protected, presumably at the site of ascorbate induced phosphorylation.
Zur Rolle des Substrats bei der Cortison-Induktion von Enzymen in der Leber
Authors: Kröger H. , Kotulla W. , Hoshino J.
Published: March 2015

Studiert wurde das Zusammenspiel zwischen Cortisonacetat und Substrat bei der Induktion der Tyrosin-α-Ketoglutarat-Transaminase und der Tryptophan-Pyrrolase.

1. Nach intraperitonealer Injektion von 600 mg/kg ʟ-Tyrosin kann die Tyrosin-α-Ketoglutarat Transaminase noch 13 Stdn. später durch 2,5 mg/kg Cortisonacetat induziert werden. Dieses tritt nicht ein bei Applikation von 300 mg/kg L-Tyrosin.

2. Die Tryptophan-Pyrrolase läßt sich nach Gabe von ʟ-Tryptophan im Falle von 500 mg/kg über einen Zeitraum von 3 Stdn., im Falle von 250 mg/kg etwa 1 Stde. induzieren.

3. Es besteht eine deutliche Parallelität zwischen Induzierbarkeit der Enzyme und Gehalt an freiem Tyrosin bzw. Tryptophan in der Leber.
Über Nitrosyl-Metall-Komplexe
Authors: Brunner Henri
Published: March 2015

Bei der Einwirkung von Jod auf [ (C6H5) 3P]2Ni (NO) J entsteht unter Abspaltung von (C6H5)3PJ2 in quantitativer Ausbeute die halogenverbrückte Verbindung (C6H5)3P (NO) NiJ2Ni (NO) P (C6H5) 3. Setzt man diesen zweikernigen Triphenyl-phosphin-Komplex mit Tri-n-butyl-phosphin um, so werden die Halogenbrücken aufgespalten. Das gebildete (C4H9) 3P [ (C6H5) 3P] Ni (NO) J mit 4 verschiedenen Liganden um das Zentralatom ist jedoch nicht stabil und zerfällt zu einem Gemisch von [ (C6H5)3P] 2Ni (NO) J und [ (C4H9)3P] 2Ni (NO) J.

Die doppelte Umsetzung von [ (C6H5) 3P] 2Ni (NO) J mit BaCS3 ergibt einen durch das CS3
2⊖-Anion verbrückten Zweikernkomplex der Zusammensetzung [ (C6H5) 3P] 2(NO) NiCS3Ni (NO) P (C6H5) 3, in dem der Thiocarbonyl-Schwefel ein Molekül P (C6H5) 3 von einem der beiden Nickelatome verdrängt hat.
FIR-Spektren von Komplexen Cu2X4(Pyridin-N-oxid)2
Authors: Schmauss G. , Fritz H. P.
Published: March 2015

Es werden die FIR-Spektren von Komplexen [CuX2 (Pyridin-N-oxid)]2 mit X = Cl und Br und verschieden substituierten Pyridin-N-oxiden beschrieben. Qualitativ findet sich ein Zusammenhang zwischen den Cu-O-Valenz-Schwingungsfrequenzen und den effektiven magnetischen Momenten. Aus der relativen Invarianz der Cu-Halogen-Valenzfrequenzen folgt, daß keinem dieser Komplexe planare Konfiguration zukommen kann.
Studies on the changes in electrical conductivity and pH during slow coagulation of ferric, chromium and aluminium tellurate sols by electrolytes
Authors: Singh Mukhtar , Bansal O. P.
Published: March 2015

The changes in pH and electrical conductivity of ferric tellurate, chromium tellurate and aluminium tellurate sols during their slow coagulation in the presence of KCl, K2SO4 and K3Fe(CN)6 have been studied in comparison with that of the aqueous solutions of ferric chloride, chromium chloride and aluminium chloride acting as the dispersion medium (the socalled intermicellar liquid), being of the same conductance as that of the respective sol. On adding the electrolyte, the maximum changes in conductance and pH have been observed to occur immediately indicating that the phenomena like ion-exchange, adsorption or surface neutralisation during the slow coagulation are instantaneous processes.
Der Einfluß von Benzol und Methylcholanthren auf die Kollagensynthese und -reifung im Granulationsgewebe
Authors: Seilern-Aspang F. , Mazzucco K. , Christian I.
Published: March 2015

Im Granulationsgewebe wird die Synthese sowie die Vernetzung des Kollagens durch Benzol gebremst.

Methylcholanthren hebt diese Wirkung teilweise wieder auf.

Der in früheren Arbeiten nachgewiesene kollagenolytische Effekt von Methylcholanthren auf die Dermis findet sich beim Granulationsgewebe nicht.
Die Kristallstruktur des Trichlorphons C4H8O4PCl3
Authors: Höhne E. , Lohs Kh.
Published: March 2015

The crystal structure of trichlorphon [O,O-Dimethyl- (1-hydroxy-2,2,2-trichlor-äthyl) -phosphonat] has been determined by PATTERSON and FOURIER methods. Space group P212121 with 4 molecules in a unit cell of dimensions α = 8,96 ± 0,03 A, b= 18,60 ± 0,05 Å, c = 5,80 ± 0,02 A were determined. Atomic coordinates and anisotropic temperature factors have been refined by the least squares method. The final R-factor is R (hkl) =0,102.
A Study of the Structure of the Complexes of Glycine and Glycylglycine with Cu(II) in Solution, Based on Viscosity Measurements
Authors: Sakellaridis P. U. , Karageorgopoulos E. K. , Tsangaris J. M.
Published: March 2015

In the relation ηr = 1 + Bm + Dm2 the Β values of the complexes bis(glycinato)Cu(II) and (glycylglycinato)Cu(II) between 10 and 40°C indicate that these complexes are hydrated by two molecules of water at their carboxyl oxygens. Large values of D indicate solute-solute interactions via the axial positions of the cupric square microsymmetry, as the molecules are moving in the liquid streamlines. For both complexes dB/dT was found to be positive in the examined temperature range. This presumably indicates that the examined complexes have a structure breaking effect on the water structure.
Cyclisierungsreaktion zwischen Chlorsulfonylisocyanat und Bis(trimethylsilylimido)-schwefeloxid / Cyclisation Reaction between Chlorsulphonicisocyanate and Bis(trimethylsilylimido)-sulph.oxide
Authors: Appel Rolf , Uhlenhaut Henning , Montenarh Mathias
Published: March 2015

N,N′ -Bis(trimethylsilyl)-sulfur(IV)diimide and Bis(trimethylsylilimido)-sulphoxide react with chlorsulphonicisocyanate to give the sixmembered heterocycles 3 and 5.
Notizen: Übergangsmetallkomplexe mit N-haltigen Liganden, IX / Transition Metal Complexes of N-Containing Ligands, IX
Authors: Herberhold Max , Bernhagen Wolfgang
Published: March 2015

Arylazo complexes of the type CpCr(CO)2-(N = N-C6H4-X(p)) (X = H, OCH3, CH3, F, NO2) have been obtained by the reaction of CpCr(CO)3Na with p-substituted aryldiazonium tetrafluoroborates in glacial acetic acid.
Notizen: Über die Darstellung eines 1-Bora-4-stannacyclohexadien(2.5)-Derivates / Synthesis of a 1-Bora-4-stanna-cyclohexadiene(2.5)-Derivative
Authors: Wrackmeyer Bernd , Nöth Heinrich
Published: March 2015

Hydrostannation of diethylamino-dipropinylborane leads to the new heterocyclic system of a 1-bora-4-stannacyclohexadiene.
Notizen: Isomerism in the Linear Tetratertiary Phosphine 1,1,4,7,10,10-Hexaphenyl-1, 4,7,10-Tetraphosphadecane
Authors: King R. B. , Heckley P. R. , Cloyd Jr. J. C.
Published: March 2015

Two isomers of the linear tetratertiary phosphine (C6H5)2ΡCH2CH2Ρ(C6H5)CH2H2Ρ(C6H5)CH2CH2Ρ- (C6H5)2 with widely differing solubilities and melting points can be obtained from the base-catalyzed addition of C6H5P(H)CH2CH2P(H)C6H5 to two equivalents of diphenylvinylphosphine; these appear to be the dl and meso diastereoisomers arising from the two equivalent asymmetric phosphorus atoms.
Darstellung und Eigenschaften von Dialkylthiophosphinsäure-N-trimethylsilylamiden / Preparation and Properties of N-Trimethylsilylamides of Dialkylthiophosphinic Acids
Authors: Steinberger Helmut , Kuchen Wilhelm
Published: March 2015

Reaction of Dialkylthiophosphorylhalides R2P(S)Hal (R = CH3, C,H5, n = C3H7; Hal = Cl, Br) with Hexamethyldisilazane gives in good yields N-Trimethylsilylamides of Dialkylthiophosphinic acids R2P(S)NHSi(CH3)3. The properties and some reactions of these compounds are reported.
Notiz zur Darstellung und Charakterisierung von [C5H5Fe(CO)2]2Sn(C6H5)Cl und [C5H5Fe(CO)2]3SnCl; Verbindungen der Reihe [C5H5Fe(CO)2]2Sn R2 / Synthesis and Characterization of [C5H5Fe(CO)2]2Sn(C6H5)Cl and [C5H5Fe(CO)2]3SnCl; Compounds of the Series [C5H5Fe(CO)2]2Sn R2
Authors: Sasse Hans-Eckard , Ziegler Manfred L.
Published: March 2015

The title compounds have been synthesized and characterized, they can be classified as compounds of the series [C5H5Fe(CO)2]2Sn R2 by their infrared spectra.
Tin(IV) Derivatives of Schiff Bases Derived from Benzaldehyde and Aminoalcohols
Authors: Singh O. P. , Prasad R. N. , Tandon J. P.
Published: March 2015

Reactions of tin(IV) chloride with monofunctional bidentate Schiff bases, having the general formula

in different stoichiometric ratios have yielded SnCl4 • SBH and SnCl4(SBH)2 type of products (where SBH is the monofunctional bidentate Schiff base). The resulting derivatives have been characterized on the basis of elemental analysis and IR spectra. Conductivity measurements show them to be nonelectrolytes.
Notizen: Eine neue ternäre Phase im System Li-Au-Sb / A New Ternary Phase in the System Li-Au-Sb
Authors: Schuster Hans-Uwe , Dietsch Wolfgang
Published: March 2015

By further investigation of the system Li—Au—Sb we found a second1 cubic phase of the formula LiAuSb which crystallizes in the spacegroup Td
2—F 4̅ 3 m, the lattice-constant is a = 6.328 Å.
Influence of Aqueous Mixtures of Amides on the Kinetics of Electro Reduction of Ni(II) and Co(II) at d. m. e.
Authors: Jha S. K. , Jha S. , and S. N.
Published: March 2015

Electroreduction of Ni(II) and Co(II) has been carried out in aqueous mixtures of formamide, acetamide and urea. Electrode kinetics in terms of theories of irreversible waves have been studied. After calculating the rate constants by DELAHAY1 and Kou-TECKY2 treatments separately their variation with electrode potential has been used to calculate the product ‘ana’. The rate constants and ‘ana’ calculated from two different approaches show remarkable agreement. `ana’ records a gradual decrease with increasing amide content of the aqueous mixture.
N-Disilanyl-phosphinimine, Darstellung und Eigenschaften / N-Disilanyl-phosphine Imines, Preparation and Properties
Authors: Wolfsberger Werner
Published: March 2015

Several routes for the synthesis of N-pentamethyldisilanylphosphine imines have been investigated. The title compounds may be prepared by methylation of N-(2-chlorodisilanyl)-phosphine imines, from tertiary phosphines and pentamethyldisilanyl azide, from triorganophosphine imines and pentamethyldisilanyl chloride, or, by transsilylation, from the corresponding N-trimethylsilylphosphine imines. 22 new compounds were characterized by elemental analysis, molecular weights, IR and NMR spectra.
4,7-Dimethoxyindole Derivatives Bearing Alkyl Groups in the Pyrrole Fused Ring: Structure of the Demethylated Compounds
Authors: Malesani Giorgio , Rigatti Giorgio
Published: March 2015

The alkylation of 4,7-dimethoxyindole and the demethylation of the obtained compounds with anhydrous aluminium chloride in benzene is described. The demethylated derivatives have the structure of 4,7-dioxo-4,5,6,7-tetrahydroindoles.
Darstellung und Eigenschaften von Ca2PCl und Sr2PCl / Preparation and Properties of Ca2PCl and Sr2PCl
Authors: Hadenfeldt Claus
Published: March 2015

Pure alkaline earth halides MX2 with M = Mg, Ca, Sr, Ba and X= Cl, Br, J were prepared by reaction of the metals with the corresponding ammonium halides in NH3 as solvent. Brown Ca2PCl and dark-brown-violet Sr2PCl were obtained by reaction of metal chloride, metal and red phosphorous in the ratio 1:3:2. Analytical results, densities and lattice constants are given.
Notizen: Photochemische Verdrängung eines an Eisen(0) koordinierten Aromaten durch ein Dien / Photochemical Replacement of an Aromatic Ligand by a Diene in an Iron(0) Complex
Authors: Fischler Ingrid , Koerner Ernst A.
Published: March 2015

The photoreaction of [(η-phenyl)phenylethylphosphane] (η -2,3-dimethylbutadiene)-iron(0) with 2,3-dimethylbutadiene results in replacement of the arene ligand by the diene, leading to a bis(diene)phosphane iron(0) complex.
Reaktionen von Pentafluorbenzolsulfen-, -sulfin- und -sulfonsäurechlorid mit Natrium-bis(trimethylsilyl)-amid / Reactions of Pentafluorobenzenesulfenyl, -sulfinyl, and -sulfonyl Chlorides with Sodium-bis(trimethylsilyl) Amide
Authors: Rinne Dieter , Blaschette Armand
Published: March 2015

By reaction with NaN[Si(CH3)3]2, the chlorides C6F5SCl, C6F5S(O)Cl, and C6F5SO2Cl are converted into C6F5SN[Si(CH3)3]2, C6F5S(O)N[Si(CH3)3]2, and Na+[C6F5SO2]-, respectively. In this instance the reactivity pattern of the pentafluorophenyl compounds does not differ from that of similar phenyl derivatives.
Notizen: Matrixisolierungs- und Isotopensubstitutionstechnik: Germaniumisotopenaufspaltung der v3(F2)-Schwingung von GeCl4 und Chlorisotopenaufspaltung von GeClnCl4-n / Matrix Isolation and Isotopic Substitution Technique: Germanium Isotopic Splitting Pattern of the v3(F2) Mode of GeCl4 and Chlorine Isotopic Splitting Pattern of GeClnCl4-n
Authors: Königer F. , Müller A. , Nakamoto K.
Published: March 2015

The matrix isolation spectrum of germanium tetrachloride in the region of the v3(F2) vibration has been measured. Applying the isotopic substitution technique the spectrum of the normal sample could be interpreted. The frequencies of the different isotopic species have been assigned.
Molekülstrukturen von Phosphorverbindungen, IV / Molecular Structures of Phosphorus Compounds, IV
Authors: Oberhammer H. , Grobe J.
Published: March 2015

The molecular structures of the two trifluoromethyl phosphoranes (CF3)2PCl3 and (CF3)3PCl2 have been determined by electron diffraction of gases. The structure of (CF3)2PCl3 was found to be a regular trigonal bipyramid with both CF3 groups in axial positions (D3h symmetry) and the fluorine atoms staggered to the equatorial chlorine atoms. The following geometric parameters (ra-values) were obtained: r(C-F) = 1.331(2) Å, r(P-C) = 1.950(II) Å, r(P-Cl) = 2.036(2) Å and ⦓ FCF = 108.3°(0.4). (CF3)3PCl2 possesses the structure of a distorted trigonal bipyramid with two CF3 groups in axial and one in equatorial position. Again the fluorine atoms of the axial CF3 groups are staggered to the equatorial atoms. The ra-values for the geometric parameters are: r(C-F)= 1.329(2) Å, r(P-C)eq= 1.938(31) Å, r(P-C)ax = 1.946(14) Å, r(P-Cl) = 2.053(6) Å, ⦓ FCF = 108.5°(0.3), ⦓ ClPCl = 133.0°(1.7) and ⦓ CaxPCeq = 95.5°(1.9). The average P-C bond length was found to be r(P-C)av = 1.943(5) A. The results for the mean square amplitudes are given in the article. It was shown that in both molecules the torsional amplitudes of the CF3 groups around the P-C bond directions are small, indicating high potential barriers to internal rotation.
Mixed Ligand Derivatives of 1: 1 Th(IV)—DTPA Chelate with Some Hydroxy Acids(H)
Authors: Pachauri O. P. , Tandon J. P.
Published: March 2015

Studies of the interaction between 1:1 Th(IV)-DTPA chelate (where DTPA = diethylenetriaminepentaacetic acid) with certain bidentate ligands, such as salicylic acid (SA), 5-sulphosalicylic acid (SSA) and 8-hydroxy quinoline-5-sulphonic acid (HQSA) have been carried out potentiometrically. The nature of the titration curves indicates that the bidentate ligand is added stepwise to the initially formed metal diethylenetriaminepentaacetate. The formation constants (log KMAB) of the resulting 1:1:1 mixed ligand derivatives have been determined at 30 ± 1 °C and μ = 0.1 (KNO3). The order of stability in terms of the secondary ligand has been found to be SA > SSA > HQSA.
Zur Reaktivität von C=N-Doppelbindungssystemen, IV1 Eine Synthese von aliphatischen Thioketonen / The Reactivity of the C=N-Double Bond Systems, IV A Synthesis of Aliphatic Thioketones
Authors: Ziegler Erich , Mayer Carl , Zwainz Johann G.
Published: March 2015

Alkylidene aniles react with H2S and benzoicanhydride in diphenyl methane to the corresponding aliphatic thioketones in excellent yields. Similarly β-thioxo compounds are synthesized.
Notizen: Schiff Base Reaction with Copper and Nickel Chlorides
Authors: Paul Ram Chand , Vasisht Sham Kumar
Published: March 2015

Schiff base, 2-acetylpropylideneamino-o-methylthiobenzene prepared by the condensation of o-methylthioaniline and acetylacetone, reacts with copper and nickel chlorides to split into o-methylthioaniline complexes of these halides.
Notizen: Mehrkernige Kobaltkomplexe: Über die Δ(ΛΛΛ)/Λ(ΔΔΔ)-Isomeren des Tris[di-μ-hydroxo-bis-(äthylendiamin)kobalt(III)]kobalt(III)-Kations / Polynuclear Cobalt Complexes: On the Δ(ΛΛΛ)/(ΔΔΔ) Isomers of the Tris[di-µ-hydroxo-bis(ethylenediamine)cobalt(III)]cobalt(III) Cation
Authors: Thewalt U. , Ernst J.
Published: March 2015

A racemic bromide pentathiocyanate trihydrate salt of the tris[di-µ-hydroxo-bis-(ethylenediamine)cobalt(III)]cobalt(III) cation has been isolated. An X-ray structure analysis shows the cations to have Δ(ΛΛΛ)/Λ(ΔΔΔ) configuration. The conformation of the chelaterings is such that the point group of the cations is C3.
Bleidioxid-Verbundelektroden für die Elektrosynthese, II Vorbehandlung von Titan für die Bleidioxidabscheidung / Lead Dioxide Electrodes for Electrosynthesis, II Pretreatment of Titanium for the Deposition of Lead Dioxide
Authors: Wabner Dietrich W. , Huss Rainer , Hindelang Fritz , Fritz Heinz P. , Missol Detlef
Published: March 2015

A novel method enables the production of lead dioxide-coated electrodes with life times of several thousand hours in certain electrooxidations. The most important step of this technique is described as an adsorption of Ti(IV)-oxalate at the titanium surface. By potential-time plots and by potentiodynamic investigation it is shown, that by Ti(IV)-adsorption the titanium surface is lifted to a higher (more noble) potential and in this way is protected against further dissolution or oxidation
Die Temperaturabhängigkeit der Re-NQR-Spektren von (H3C)3SiReO4 und (H3C)3GeReO4 / Temperature Dependence of Re-NQR Spectra of (H3C)3SiReO4 and (H3C)3GeReO4
Authors: Bubkert Paul K. , Koth Detlev , Schmidbaur Hubert
Published: March 2015

Re-NQR spectra of polycrystalline (H3C)3SiReO4 and (H3C)3GeReO4 show a strong temperature dependence of their transition frequencies, with temperature coefficients, which differ from those of the ionic perrhenates.
Spektroskopische Untersuchungen, X. Elektronenstoßinduzierte SO- und CO2-Eliminierungen aus N.N-Dimethyl-C-Arylsulfonylformamiden / Spectroscopic Investigations, X. Electron-impact Induced SO- and CO2-Elimination from N.N-Dimethyl-C-arylsulfonylformamides
Authors: Praefcke Klaus , Schwarz Helmut , Weichsel Christian
Published: March 2015

Mass-spectrometric investigations of the titel compounds show for the first time that SO-elimination is also possible from acyclic sulfonyl derivatives. From results of the defocusing technique follows that both this process and the elimination of CO2 from the molecular ions are relative slow. Prove of these reactions can be found in the analysis of the metastable ions. These results are supported by substituent effects.
Zur Darstellung und Struktur einer neuen FeNbO4-Modifikation.
Authors: Brunner Herbert , Gruehn Reginald
Published: March 2015

Three different polymorphs of FeNbO4 were prepared by chemical transport. One of them is a new modification, which crystallisizes in the GaNbO4-type, monoclinic, space group C2, a = 12.52 Å; b= 3.83 Å; c = 6.67 A; β = 107.5°. The detailed structure, composed of 2 x 2 ‘blocks’ of corner shared metal-oxygen octahedra, was investigated by electron-diffraction and two-dimensional high resolution electron microscopy.
Übergangsmetall-π-Komplexe mit ungesättigten und aromatischen Heterocyclen, IV π-Komplexe methylsubstituierter Pyridinderivate mit Chrom(0).
Authors: Biedermann Hans-G. , Öfele Karl , Tajtelbaum Jakub
Published: March 2015

Pyridine π-complexes are prepared by treating 2,6-dimethylpyridine and 2,3,5,6-tetramethylpyridine with Cr(CO)6. Thus, tricarbonyl(2,6-dimethylpyridine)chromium(0) and tricarbonyl(2,3,5,6-tetramethylpyridine)chromium(0) are obtained. IR and 1H NMR spectra are discussed together with those of tricarbonyl(pentamethylpyridine)chromium(0) and tricarbonyl(2,4,6-trimethylpyridine)chromium(0).
Beiträge zur Untersuchung anorganischer nichtstöchiometrischer Verbindungen, V. Präparative und elektronenoptische Untersuchungen an FeNb11O29, FeNb29O74 und TiNb14O37.
Authors: Brunner Herbert , Gruehn Reginald , Mertin Wilhelm
Published: March 2015

FeNb11O29(m), FeNb11O29(o) and two mixed oxides with the composition limits FeNb29O74 and TiNb14O37 were prepared by chemical transport. The crystal structures of the compounds have been examined by two-dimensional high resolution electron-microscopy. They are composed of ‘blocks’ of (n × 3) corner shared octahedra and belong to a series of structure related compounds with the general formula Me3nO8n-3. Crystallographic defects and the thermic behavior of the materials are discussed.
1-Chloro- and 1-Hydroxyphospholene-1-sulfides
Authors: Moedritzer Kurt
Published: March 2015

A mixture of the two isomers of 1-chlorophospholene-1-oxide, obtained by a one-step, high-yield procedure reported previously1, upon reaction with P4S10 was converted to a mixture of the two isomers of 1-chlorophospholene-1-sulfide which may be separated by spinning-band distillation. The thus obtained isomerically pure 1-chlorophospholene-1-sulfides were hydrolyzed to the corresponding 1-hydroxyphospholene-1-sulfides. These, as well as the precursor chloro compounds, were characterized by 1H, 13C, and 31P NMR, mass spectrometry, and IR.
Notizen: The Synthesis of a New Fused Thiazolo [4,3-c] -1,2,4-triazole System and its Derivatives
Authors: Kassab Nazmi Abd Elatif , Allah Sanaa Osman Abd , Reheem Ead Hamed Abdel
Published: March 2015

Cyclisation of the 4-phenylhydrazono derivatives of 2-thiazolidinone or 2-thiazolidinethione (1) with formaldehyde solution or with aromatic aldehydes yields 2-phenyl-2,3-dihydrothiazolo[4,3-c]-1,2,4-triazol-5-one or its 5-thiocarbonyl analogue (2). Condensing 2 with aromatic aldehydes afforded the corresponding 7-arylidene derivatives (8).

The 5-arylidene derivatives of 4-anisylimino-2-thiazolidinethione (5) were obtained by condensing 4 with aromatic aldehydes. The potassium salt of 5 reacts readily with alkyl halides to yield the 5-arylidene derivatives of 4-anisylimino-2-alkylmercapto-2-thiazoline (6).
Notizen: Melting Curve of NaClO3 to 42 kbar
Authors: Wolbarst A. B. , Clark J. B. , Richter P. W.
Published: March 2015

The melting curve of NaClO3 was determined to 42 kbar. The equation

tm (°C) = 270 + 15.09 (P-0,85) — 0.4044 (P-0.85)2 + 0.004555 (P-0.85)3

fits the data with a standard deviation of 5°C.
Natrium-bis [trimethylsilyl] -amid als Protonenacceptor gegenüber organischen Liganden in substituierten Metallcarbonylen.
Authors: Moll Matthias , Behrens Helmut , Kellner Reinhard , Knöchel Hans , Würstl Peter
Published: March 2015

The reaction of M(CO)5NCCH3 (M = Cr, Mo, W) and C7H8Fe(CO)3 with sodium bis-[trimethylsilyl] amide does not lead to the transformation of a CO group into CN⁻, but instead, to a deprotonation to give the anions [M(CO)5NCCH2]⁻ and [C7H7Fe(CO)3]⁻.
Untersuchung des MÖSSBAUER-Effekts in Elpasolithen A2
INaFeF6.
Authors: Pebler J. , Schmidt K. , Haegele R. , Babel D.
Published: March 2015

57Fe-MÖSSBAUER spectra of the cubic elpasolithes A2
INaFeF6 (AI = K, Rb, Cs) show strong single line broadening in the temperature range 4.2 K ≤ T ≤ 600 K. This broadening is attributed to a statistical distribution of differently distorted FeF6
3-octahedra, causing a statistical distribution of electric fieldgradients at the 57Fe-position. With the aid of a model calculation it was tried to estimate the order of the octahedral distortion. For the compound Rb2NaFeF6 normal to the cell axis an anion displacement of Δ q = 0.11 Å from the regular octahedral position was derived from the Mössbauer data. This value agrees with the root mean square displacement ū = 0.13 Å, which results in this direction from the strongly anisotropic fluorine temperature factors found by X-ray structure determination.
Über die Struktur und das Hochdruckverhalten des β-Li6UO6.
Authors: Hauck Jürgen , Rosenhauer Matthias
Published: March 2015

Li6UO6 has a reversible phase transformation at 680°C and decomposes above about 850°C. At high pressure the low temperature modification becomes unstable because of an invariant point in the system Li2O—Li4UO5 at approximately 13 Kb and 620°C. β-Li6UO6 has a triclinic unit cell with a = 5.203, b= 5.520, c = 5.536 Å, α = 114.7, β = 120.7 and γ = 75.5°. The close relationship between the crystal structures of Li6TeO6 and Li6UO6 is also suggested from similar infrared spectra and from partial solid solution Li6UO6—Li6TeO6.
Photochemical Redox Reaction of Aqueous Benzylpentacyanocobaltate(III)
Authors: Vogler Arnd , Hirschmann Renate
Published: March 2015

Charge transfer excitation of aqueous benzylpentacyanocobaltate(III) led to a redox reaction with formation of Co(CN)5
3- and benzyl radicals in the primary photochemical step. In the absence of oxygen the benzyl radicals dimerized to bibenzyl. At 313 nm irradiating wavelength the quantum yield was 0,13 ± 0,02. In the presence of air oxygen was apparently inserted into the carbon-cobalt bond with the intermediate formation of [Co(CN)5O2CH2C6H5]3-, which decomposed to give Co(CN)5H2O2- and benzaldehyde (ɸ = 0,15 ± 0,02). The significance of these results is discussed with regard to the photochemistry of acidopentacyanocobaltates(III) and organocobalamins.
Isomerisierung von Pd–O=PR3-koordiniertem ο,o′-Bis(phenyläthinyl)-triphenylphosphinoxid.
Authors: Winter Werner
Published: March 2015

Conformational Stability, 1H NMR

o,o′-Bis(phenylethynyl)-triphenylphosphineoxide, coordinated to Pd(II) with the P=0-group, is isomerized in boiling xylene to the condensed phosphepin- and dihydrophosphocin oxides (4) and (6). The structure of 6 is determined by catalytic hydrogenation, 1H NMR and confirmed by an X-ray analysis, currently carried out. The hydrogenated products 7A and 7B are conformational isomers. The kinetic data of the ring inversion 7 A ⇄ 7B are determined.
Die Struktur von Bis(cyclopentadienyldicarhonylmangan)-1.2-diphenyldiphosphan, [C5H5(CO)2Mn]2PhP(H)—(H)PPh.
Authors: Huttner G. , Müller H.-D. , Bejenke Vera , Orama O.
Published: March 2015

The title compound 1 contains complex stabilized 1,2-diphenyldiphosphane. It crystallizes in space group P21/c with a = 1095(1), b = 1145(1), c = 1186(1) pm, β= 124.73(5)°, Z = 2. The structure has been solved by coventional methods; full matrix refinement converged at R1= 0.045.

1 shows crystallographic inversion symmetry and thus contains a meso-1,2-diphenyldiphosphane ligand. The P–P-distance is 225.8 pm, the Mn–P bonds are rather short (221.6 pm).
Zur Kenntnis der schweren Seltenerdoxidchloride.
Authors: Beck H. P.
Published: March 2015

The synthesis and the crystal data of the oxychlorides of Er, Tm, Yb and Lu are reported. All compounds are isostructural, crystallizing in the rhombohedral SmSJ-type arrangement. The range of existence of the two structure types occurring with the rare earth oxychlorides is briefly discussed on the basis of electrostatic calculations.
Über Erdalkalimetalloxogallate, VI Zum Problem der Mischkristallbildung zwischen CaGa2O4 und CaAl2O4 / On Alkaline Earth Metal Oxogallates, VI About Mixed Crystal Formation of CaGa2O4-CaAl2O4
Authors: Müller-Buschbaum Hk. , Schmachtel W.
Published: March 2015

Mixed crystals of the formulae CaGaAlO4 (1) and CaGa0.5Al1.5O4 (2) were investigated by X-ray single crystal work. 1 shows a tetrahedral orientation like that of CaGa2O4 (monokl.), 2 another one of CaAl2O4. A discussion of the different polyhedral arrangement of the stuffed tridymite structures is given.
Mass Spectral Studies on Pyrazaboles
Authors: May C. E. , Niedenzu K. , Trofimenko S.
Published: March 2015

The mass spectra of several pyrazaboles of type 1 (R = H) have been studied. The data illustrate that electron impact causes three major fragmentation patterns for the species. Symmetrical cleavage of the pyrazabole followed by further breakdown is common to all compounds. In addition, those pyrazaboles containing H or CH3 at the C atoms of the pyrazole rings undergo an electron impact-induced rearrangement which appears to result in the formation of a species containing a B2N3 ring as a structural entity; subsequent breakdown leads to a B2N2 ring system. The mass spectra of halo- or pseudohalo-substituted pyrazaboles evidence the ready loss of hydrogen halide as a predominant feature; no rearrangement ions are observed.
Notizen: Übergangsmetall-Carbin-Komplexe, XXIV1 Trans-Bromotetracarbonyl(2-thienyl) carbinchrom und -wolfram / Transition Metal Carbyne Complexes, XXIV1 Trans-Bromotetracarbonyl (2-thienyl)carbyne Chromium and Tungsten
Authors: Fischer Ernst Otto , Selmayr Tassilo
Published: March 2015

Pentacarbonyl[acetoxy(2-thienyl)carbene]-chromium(0) and -tungsten(0) react with BBr3 to give trans-bromotetracarbonyl(2-thienyl)carbyne-chromium and -tungsten.

Beim Versuch an Pentacarbonyl(hydroxyphenyloarben)chrom(0)2 mit BBr3 die Hydroxygruppe
Kristallstruktur von Bis(N.N′-bis(8-chinoyl)äthylendiaminato)nickel(II) / Crystal Structure of Bis(N,N′-bis(8-chinoyl)ethylenediaminato)nickel(II)
Authors: Endres H. , Keller H. J. , Poveda A.
Published: March 2015

The title compound NiC20H16N4 crystallizes in the monoclinic space group Ρ21/a with unit cell dimensions a = 12.07(2) Å, b= 10.712(4) Å, c = 13.50(3) Å, β= 113.1(1)°. The structure was refined by a blockmatrix least squares procedure to R = 0.126, based on 1258 observed intensities. The planar molecules form centro-symmetric dimers in the solid state with interplane distances of 3.3 A.
Reactions of Chromyl Chloride with Monocarboxylic Acids
Authors: Paul Ram Chand , Baidya Om Bahadur , Gupta Surinder Kumar , Kapoor Ramesh
Published: March 2015

Chromyl chloride reacts with formic and acetic acids to give products which contain the trinuclear cation [Cr3O(OOCR)6(RCOOH)3]+. The compounds have been characterized by elemental analyses, infrared spectral data, magnetic measurements and thermogravimetry.
Interpretation of ESCA Chemical Shifts for o-Arylenedioxy Chelates of Silicon
Authors: Gray Robert C. , Hercules David M.
Published: March 2015

ESCA data on the o-arylenedioxy chelates of silicon have been correlated with data on other organosilicon compounds using PAULING electronegativities. The data do not support p π → d π back bonding in the anionic chelates.
Synthesen von Heterocyclen, 203. Zur Chemie der vicinalen Triketone, X. Über Reaktionen von vicinalen Triketonen mit Aminopyridinen / Syntheses of Heterocycles, 203. The Chemistry of Vicinal Triketones, Χ Reactions from Vicinal Triketones with Aminopyridines
Authors: Wittmann Helga , Taleban Hossein , Herzog Reinhard
Published: March 2015

1,2,3-Trioxo-1,3,6,7-tetrahydro- 1H, 5H-benzo[ij]quinolizine (TMCHi) and 2,3-dihydro-1,2,3-trioxo-phenalene (PT) react with 2-aminopyridine to give the 2-pyridylimino-1,3-diones of type 1. However TMCHi and PT react under similar conditions with 3-aminopyridine to yield the corresponding ringclosed products of type 2. From TMCHi with two moles of 2-aminopyridine 2-oxo-1-(2-pyridylamino)-1,2,5,6-tetrahydro-4H-pyrrolo-[3,2,1-ij]quinoline (3) are formed.
Darstellung von spezifisch D- und 18O-markierten Cardenoliden / Synthesis of Specifically D and 18O Labelled Cardenolides
Authors: Flaskamp Elmar , Budzikiewicz Herbert
Published: March 2015

The synthesis of specifically labelled (D, 18O) cardenolides is described.
Untersuchungen an quartären Pyridinium-Salzen, VI1 Reaktionen von quaternierten Pyridin-Derivaten mit dem Trichlormethyl-Anion / Investigations of Quaternary Pyridinium-Salts, VI1 Reactions of Quaternated Pyridines with the Trichloromethylanion
Authors: Gündel Wolf-Hellmut
Published: March 2015

The method to generate the trichloromethylanion from chloroform and bariumhydroxide was used to prepare some substituted trichloromethyl-1,2-dihydropyridines and trichloroazabicyclo[4,1,0]heptenes.