Structural investigations of metal–nitrate complexes. Part VI. Crystal and molecular structure of dinitratotrispyridinecadmium(II)

Abstract

The structure of the title compound has been determined by three-dimensional X-ray analysis from diffractometer data. The crystals are monoclinic, space group C2/c, with Z= 4 in a unit cell of dimensions a= 12·434, b= 9·494, c= 17·385 Å, β= 115·42°. The structure was solved by the heavy-atom method and refined by least-squares, full-matrix calculations to a R 0·084 for 1491 independent data. The molecule is monomeric and is constrained to possess crystallographic two-fold symmetry. Surrounding the cadmium are three pyridine groups (Cd–N 2·301, 2·347 Å) and two bidentate nitrate groups (Cd–O 2·444, 2·491 Å). The larger ionic radius of cadmium enables the seven-co-ordinate environment to be more regular than in the analogous Co^II, Cu^II, and Zn^II compounds.