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  • 1
    ISSN: 0044-2313
    Keywords: Alkali metal pnictido indates, -gallates ; crystal structures ; vibrational spectra ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: K2NaGaP2, Cs2NaGaP2, K2NaGaAs2, K2NaInP2 and K2NaInAs2, Compounds with the Polyanions 1∞[MX4/2]3- (M=Ga, In; X=P, As) isosteric with SiS2The title compounds are synthesized from stoichiometric mixtures of the elements or from Na, KP(KAs), Cs4P6 and MX (M=Ga, In; X=P, As) at 950K. They are isotypic and crystallize in the space group Ibam (No. 72) with Z=4. The anionic partial structure is characterized by infinite chains 1∞[MX4/2]3- which are isosteric to SiS2. Vibrational spectra are measured and interpreted based on the symmetry D4h-P(2/m 2/c)42/m of the isolated polymer chain 1∞[MX2]3-. A good agreement between observed and calculated frequencies is obtained by using a force field of the tetrameric fragment [M4X10]18- (three four-membered M2X2 rings).
    Notes: Die Titelverbindungen werden aus den stöchiometrischen Gemischen der Elemente oder aber aus Na, KP(KAs) bzw. Cs4P6 und MX (M = Ga, In; X = P, As) bei 950 K dargestellt. Sie sind isotyp und kristallisieren in der Raumgruppe Ibam (Nr. 72) mit Z=4. Die anionische Partialstruktur ist durch unendliche Ketten 1∞[MX4/2]3- charakterisiert, isoster zu SiS2. Schwingungsspektren wurden gemessen und mit der Symmetrie D4h-P(2/m 2/c)42/m der isolierten Polymerkette 1∞[MX2]3- interpretiert. Eine gute Übereinstimmung zwischen den beobachteten und berechneten Frequenzen erhält man bei Verwendung des Kraftfeldes für das tetramere Fragment [M4X10]18- (drei M2X2-Vierringe).
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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