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  • 1
    ISSN: 0044-2313
    Keywords: Zintl phases ; carbonate isostructural anions ; alkali metal pnictidostannate(IV)-oxides ; preparation ; crystal structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Carbonate Isostructural Anions [SnX3]5- in the Compounds Rb6[SnX3]O0.5 and Cs6[SnX3]O0.5 with X = As, Sb, and BiThe metallic shining compounds Rb6[SnX3]O0.5 and Cs6[SnX3]O0.5 with X = As, Sb, and Bi were prepared from the melt starting from adequate mixtures of the elements and SnO2. They crystallize in the hexagonal system (space group P63/mmc, No. 194, Z = 2) with the lattice constants mentioned in „Inhaltsübersicht“. In the structures of the isotypic compounds tin and the main group(V) elements build up trigonal planar anions [SnX3]5- with X = As, Sb, and Bi isostructural to the carbonate anion, oxygen forms isolated O2- ions. The bond lengths Sn—X are significantly shortened with respect to the sums of Pauling covalent radii. The atoms of the units [SnX3]5- are coordinated by alkali metal cations forming trigonal prisms and the O2- anions occupy octahedral holes.
    Notes: Die metallisch glänzenden Verbindungen Rb6[SnX3]O0,5 und Cs6[SnX3]O0,5 mit X = As, Sb und Bi wurden aus Schmelzreaktionen ausgehend von entsprechenden Gemengen der Elemente und SnO2 erhalten. Sie kristallisieren hexagonal, Raumgruppe P63/mme (Nr. 194), Z = 2, mit den Gitterkonstanten: In den Kristallstrukturen der isotypen Verbindungen treten zum Carbonatanion isostrukturelle [SnX3]5--Anionen mit X = As, Sb und Bi und isolierte O2--Ionen auf. Die Bindungslängen Sn—X sind gegenüber der Summe der kovalenten Einfachbindungsradien nach Pauling signifikant verkürzt. Die Atome der [SnX3]5--Einheiten werden von den Alkalimetallkationen in Form von trigonalen Prismen koordiniert, die O2--Anionen besetzen Oktaederlücken.
    Additional Material: 3 Ill.
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  • 2
    ISSN: 0044-2313
    Keywords: Arsenidostannates ; alkali - alkaline earth substitution ; [SnAs] nets isostructural grey arsenic ; crystal structure ; Zintl phases ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Arsenidostannates with [SnAs] Nets Isostructural to Grey Arsenic: Synthesis and Crystal Structure of Na[Sn2As2], Na0.3Ca0.7[Sn2As2], Na0.4Sr0.6[Sn2As2], Na0.6Ba0.4[Sn2As2], and K0.3Sr0.7[Sn2As2]The metallic lustrous compounds Na[Sn2As2], Na0.3Ca0.7[Sn2As2], Na0.4Sr0.6[Sn2As2], Na0.6Ba0.4[Sn2As2] and K0.3Sr0.7[Sn2As2] were prepared from melts of mixtures of the elements. The compounds crystallize in the trigonal system (space group R3m, No. 166, Z = 3) with lattice constants see in “Inhaltsübersicht”. The structures are isotypic to Sr[Sn2As2] containing puckered ∞2[SnAs] nets which are stacked with a sequence of six layers. The E(I)/E(II) atoms are located between each second ∞2[SnAs] layer in trigonal antiprismatic interstices formed by As atoms. In the resulting ∞2[Sn2As2] double layers the ∞2[SnAs] nets are stacked in such a way that additional Sn - Sn contacts arise.
    Notes: Die metallisch glänzenden Verbindungen Na[Sn2As2], Na0,3Ca0,7[Sn2As2], Na0,4Sr0,6[Sn2As2], Na0,6Ba0,4[Sn2As2] und K0,3Sr0,7[Sn2As2] wurden aus Schmelzreaktionen, ausgehend von Gemengen der Elemente erhalten. Die Verbindungen kristallisieren trigonal, Raumgruppe R3m (Nr. 166), Z = 3, mit den Gitterkonstanten (pm): TextNa[Sn2As2]a = 400,6(2)c = 2758,1(5)c/a = 6,885Na0,3Ca0,7[Sn2As2]a = 410,1(2)c = 2648,6(5)c/a = 6,458Na0,4Sr0,6[Sn2As2]a = 411,7(2)c = 2718,5(5)c/a = 6,603Na0,6Ba0,4[Sn2As2]a = 409,2(2)c = 2793,4(5)c/a = 6,826K0,3Sr0,7[Sn2As2]a = 417,6(2)c = 2714,6(5)c/a = 6,500 - In den im Sr[Sn2As2]-Typ kristallisierenden Verbindungen sind zum grauen Arsen isostrukturelle ∞1[SnAs]-Netze ausgebildet, die senkrecht zur c-Achse eine Sechserschichtfolge aufweisen. Jeder zweite ∞1[SnAs]-Schichtzwischenraum ist von E(I)/E(II)-Atomen in trigonal antiprismatischen Lücken aus As-Atomen belegt. In den resultierenden ∞2[Sn2As2]-Doppelschichtpaketen sind die benachbarten ∞2[SnAs]-Netze so zueinander orientiert, daß relativ kurze Sn - Sn-Kontake ausgebildet werden.
    Additional Material: 2 Ill.
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