Strukturen von [Me4Sb]2[MeSbI4]MeSbI2, und [Me4Sb]I. Darstellung von Me3Sb · MeSbI2 und farbwechsel bei Me4Sb2 · Me2SbBr
摘要:
The crystal structures of the complex [Me4Sb]2[MeSbI4] (1) and its precursors MeSbI2 (2) and [Me4Sb]I (3) are reported. In 1 there are tetrahedral cations and square pyramidal anions with Sb-I distances of 290-320 pm. The structure of 2 contains MeSbI2 molecules. They associate via iodine bridges to form linear chains with alternating short and long Sb-I distances. The coordination around antimony is distorted tetragonal pyramidal. The tetrahedral coordination of the ions in 3 results in the formation of a wurtzite type structure with antimony-iodine distances of 406 and 435 pm. The novel adducts Me3Sb.MeSbI2 (4) and Me2SbSbMe2.Me2SbBr (5) are formed by reaction of the components. They decompose easily with formation of antimony(V) compounds. Crystals of 5 are yellow but become reversibly black on cooling.