Structural investigations of metal nitrate complexes. Part I. Crystal and molecular structure of bis[dinitratobis(pyridine)copper(<scp>II</scp>)]–pyridine [Cu(NO₃)₂(py)₂]₂,py

Abstract

The structure of the dimeric complex of empirical formula Cu(NO3)2(py)2 has been determined by a single-crystal X-ray analysis. The crystals are monoclinic, space group P21/c, with two molecules of the dimer and two molecules of pyridine (revealed in the course of the analysis) in a unit cell of dimensions, a= 9·79, b= 10·89, c= 16·15 Å, β= 98·0°. The structure was solved by the heavy-atom method and refined by least-squares calculations to a final R of 0·104 for 2386 independent reflexions. The molecular structure revealed by our analysis not only shows coordination which is unusual for copper(II) complexes, but in addition yields further information about the geometries of co-ordinated nitrate groups.