The crystal structure of calcium bis[triacetatostannate(II)]: evidence for an unusual regular trigonal-pyramidal environment for tin

Abstract

An unusual regular trigonal-pyramidal environment is found for the tin atoms in the title compound. The structure has been determined by the heavy-atom method from 531 diffractometer reflections and refined by full-matrix least-squares methods to R 0.051. The crystals are trigonal, space group P(C¹3i, no. 147). with a= 8.31, c= 8.49 Å, and Z= 1. The environment of the tin atoms is unusual in that it is regular trigonal pyramidal with three Sn–;O bonds of 2.14 Å and pyramidal bond angles of 83.5°.