Über Cadmiumpermanganat-Hexahydrat

Zusammenfassung Das Pulverdiagramm, mit welchen die Gitterkonstanten und die Raumgruppe festgestellt wurden, sowie das IR-Spektrum und eineDTA-Untersuchung von Cd(MnO₄)₂·6 H₂O werden angegeben und kurz besprochen.X-Ray powder data, unit cell dimensions, space group, IR-spectrum andDTA data of Cd(MnO₄)₂·6 H₂O are given and shortly discussed.     

Absch?tzung mittlerer Schwingungsamplituden der Metall—Sauerstoff-Bindungen einiger Hexaoxometallate

Mean amplitudes of vibration of a series of hexaoxometalates have been estimated using an approximation method and recently reported spectroscopic data arising from the study of the respective lithium salts.     

Vibrational behaviour of a bridge: comparison of simplified and accurate calculations

By means of an accurate calculation of particular interaction effects, the validity limits or applicability of the terms derived from a simplified calculation are given.     

Die IR-Spektren von Kobalt-, Nickel- und Zink-Orthovanadat

Infrared spectra of crystalline Co₃(VO₄)₂, Ni₃(VO₄)₂ and Zn₃(VO₄)₂ as well as the laser-Raman spectrum of the last mentioned compound are reported and discussed. A series of solid solutions of the type (Zn/Ni)₃(VO₄)₂ have also been prepared and investigated, in order to obtain a wider insight into the spectroscopic behaviour of this class of compounds in the 500-250 cm^–1 region. Comparisons with the formerly investigated isotypic Mg₃(VO₄)₂ allows to confirm some of the earlier statements and assignments in the light of additional experimental information.

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26. Mitt. der Reihe Orthovanadate und verwandte Verbindungen. 25. Mitt.:E. J. Baran, J. Mol. Struct., im Durck; 24. Mitt.:E. J. Baran undI. L. Botto; J. inorg. nucl. Chem., im Druck; 23. Mitt:M. E. Escobar undE. J. Baran, Z. anorg. allg. Chem., in Druck.     

Die IR-Spektren einiger Metavanadate mit tetraedrischer Vanadin-Koordination

The infrared spectra of the isostructuralMVO₃ compounds (M=K, Rb, Cs, Tl, NH₄), consisting in an array of infinite tetrahedral chains, are reported and discussed with the aid of a simplified factor group analysis. In the case of NH₄VO₃ also the laser-Raman spectrum was recorded and analyzed. Force constants, mean amplitudes of vibration and other bond properties for the terminal VO₂ groups, as well as for the VOV chain units are estimated.

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17. Mitteilung der Reihe Orthovanadate und verwandte Verbindungen. 16. Mitt.:I. L. Botto undE. J. Baran, Z. anorg. allgem. Chem., im Druck; 15. Mitt.:E. J. Baran undI. L. Botto, Mh. Chem.107, 633 (1976).     

A new tricyclic triketone from tandem condensation reactions

Perhydrophenanthrene-1,5,10-trione (6) was isolated from the reaction of methyl 3-(carboxymethyl)cyclohexanone and cyclohexenone in a tandem Michael-Claisen reaction. NMR and X-ray analysis confirmed the structure of the product.     

Diguanidinium hydrogenarsenate monohydrate and its deuterated analogue vibrational, DSC and X-ray investigations

The crystal structure of diguanidinium hydrogenarsenate monohydrate has been found to belong to the P42(1)/c space group of the tetragonal system, with Z = 8, a = 17.114(2) A, c = 7.3500(10) A. In this complex, a network of hydrogen bonds links water molecules and hydrogenarsenate ions. The hydrogenarsenate ions form hydrogen-bonded chains along the crystallographic c-axis. Detailed vibrational studies have been carried out (FTIR and FT-Raman on powder samples, polarized FTIR microscope on a small single crystal at room temperature). The vibrational spectra are discussed in relation to the crystal structure. Calorimetric (DSC) studies have been performed, but no phase transition was found in the temperature range 100-350 K.