ISSN:
0044-2313
Keywords:
Chemistry
;
Inorganic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Description / Table of Contents:
Ternary BaAl4-Type Derivatives. Preparation and Crystal Structure of CaCu2As2, Ca2Cu6P5, and Ba2Cu3P4CaCu2As2, Ca2Cu6P5, and Ba2Cu3P4 (space groups and lattice constants see „Inhaltsübersicht“) have been prepared by heating the elements. Their structures are ternary BaAl4-type derivatives.CaCu2As2 (with a partial unoccupation of the Cu positions) crystallizes in a ThCr2Si2-type structure, whereas the structure of Ca2Cu6P5 is built up by stacking three unit cells of CaCu2P2 (ThCr2Si2-type) on top of each other and taking away two Ca—P-layers. The atomic arrangement of Ba2Cu3P4 can be interpreted as a new variant of the ThCr2Si2-type structure too with bands of edge shared CuP4-tetrahedra and characteristic P2-pairs.
Notes:
CaCu2As2 (I4/mmm, a = 412,9(1) pm, c = 1 025,1(1) pm, Z = 2) kristallisiert im ThCr2Si2-Typ, die Cu-Punktlage ist wie bei dem isotypen Phosphid unterbesetzt. Die Struktur von Ca2Cu6P5 (I4/mmm, a = 410,5(1) pm, c = 2 465,7(2) pm, Z = 2) besteht aus drei übereinander gestapelten Blöcken des ThCr2Si2-Typs, wobei allerdings zwei Ca—P-Lagen fehlen. Die Atomanordnung von Ba2Cu3P4 (Ibam, a = 934,7(2) pm, b = 1 241,5(2) pm, c = 618,8(1) pm, Z = 4) kann als neue Variante der ThCr2Si2-Struktur beschrieben werden, bei welcher Bänder von kantenverknüpften CuP4-Tetraedern sowie charakteristische P2-Hanteln strukturbestimmende Merkmale sind.
Additional Material:
2 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/zaac.19905810121
