Cd8As7Cl: A novel pnictidohalide with a new structure typeстатья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:A novel cadmium arsenide chloride, Cd8As7Cl (I), has been prepared by a two-step stoichiometric synthesis. It crystallizes in the cubic space group P23 (No. 195) with a unit cell parameter a = 7.2660(10) Angstrom (Z = 1). The crystal structure has been solved based on single-crystal X-ray diffraction data (omega-2 theta scans, least-squares refinement on F-2) to R = 0.0258 and wR(2) = 0.0435. I possesses a new type of crystal structure that is described as a distorted (not dense) primitive cubic packing of cadmium atoms, the cubic voids of which are filled by either arsenic or chlorine atoms or As-As pairs. The structure of I exhibits a position disorder for one-half of the cadmium atoms. The As-As pairs are cubically surrounded by eight cadmium atoms, the As-As separation being 2.43 Angstrom, which is longer than in all known cadmium and mercury arsenide halides. Attempts to synthesize the corresponding bromide and iodide failed. (C) 1997 Academic Press.