SiS2-isostrukturelle Anionen [SiP22−], [GeAs22−] und [SnAs22−] in Alkaliverbindungen

Journal of The Less Common Metals Pub Date : 1991-09-20 DOI:10.1016/0022-5088(91)90355-8

Brigitte Eisenmann, Jürgen Klein

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引用次数: 21

Abstract

K₂[GeAs₂], Rb₂[SnAs₂], Cs₂[SiP₂], Cs₂[SiAs₂] and Cs₂[SnAs₂] were prepared from molten mixtures of the elements under an argon atmosphere in Al₂O₃ crucibles. The compounds form needle-shaped crystals, which are sensitive to moisture. The structures are of the K₂[SiP₂] type and contain the polyanionic chains $_{∞}^{1} [SiP_{42}^{2−}],_{∞}^{1} [SiAs_{42}^{2−}],_{∞}^{1} [GeAs_{42}^{2−}] and_{∞}^{1} [SnAs_{42}^{2−}]$ composed of edge-sharing tetrahedra, isoelectronic and isostructural with SiS₂. The structures were refined from X-ray single-crystal data: space group Ibam (No. 72), Z = 4. K₂[GeAs₂]: a = 1329.2(4) pm, b = 702.8(3) pm, c = 654.8(3) pm Rb₂[SnAs₂]: a = 1397.4(4) pm, b = 745.4(3) pm, c = 694.2(3) pm Cs₂[SiP₂]: a = 1412.7(4) pm, b = 746.2(3) pm, c = 619.6(3) pm Cs₂[SiAs₂]: a = 1442.5(4) pm, b = 757.1(3) pm, c = 642.0(3) pm Cs₂[SnAs₂]: a = 1465.7(4) pm, b = 773.3(3) pm, c = 695.3(3) pm

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SiS2-isostrukturelle Anionen [SiP22−][GeAs22−]和[SnAs22−]Alkaliverbindungen

K2[GeAs2]、Rb2[SnAs2]、Cs2[SiP2]、Cs2[SiAs2]和Cs2[SnAs2]是在氩气氛下在Al2O3坩埚中由元素的熔融混合物制备的。这些化合物形成针状晶体，对水分很敏感。该结构为K2[SiP2]型，包含由共边四面体组成的多阴离子链∞1[SiP422-]、∞1[SiAs422-]、∞1]GeAs422-]和∞1[SnAs422-]，与SiS2等电子且同构。根据X射线单晶数据对结构进行了细化：空间组Ibam（编号72），Z=4。K2[GeAs2]：a=132.2（4）pm，b=702.8（3）pm，c=654.8（3）pmRb2[SnAs2]：a=1397.4下午，b=773.3（3）下午，c=695.3（3）晚上

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Journal of The Less Common Metals

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