X-ray crystal structure and spectral study of [Cu(C10H8N2)2(C6H4COSO2N)]· (C6H4COSO2N)·3H2O

The title compound has been synthesized and its crystal structure determined at room temperature. The final R is 0.047 for 2216 independent observed reflections with I ⩾ 3σ(I). The crystal structure consists of repeated [Cu(bipy)2(sacch)]+ cations, non-coordinated saccharin anions and three lattice water molecules. In the complex cation [Cu(bipy)2(sacch)]+], the Cu2+ is bonded to the five nitrogen atoms originating from two bipyridines and one saccharin with a distorted trigonal-bipyramidal stereochemistry. The d-d transition absorption and IR spectra of the title compound crystal are also reported and are explained perfectly by the scaling radial theory proposed by us.