Crystal Structure and Vibrational Behaviour of Tetraaqua di(nicotinamide)M(II)-Saccharinates, with M(II) = Co, Ni, Zn

E. E. CASTELLANO; O. E. PIRO; B. S. PARAJÓN-COSTA; E. J. BARAN

Z. Naturforschung B

Verlag

Año: 2002 vol. 57 p. 657 - 660

The crystal structures of [M(nic)2(H2O)4](sac)2 (nic = nocotinamide; sac = saccharinate anion) with M = Co(II), Ni(II) and Zn(II), have been determined at 116 K by single-crystal X-ray diffractometry. They crystallize in the triclinic space group P(-1) with Z = 1 and the M(II) cations present a slightly distorted MN2O4 octahedral environment, equatorially coordinated to four water molecules and axially to the pyridine N-atom of two symmetry related nicotinamide ligands.  The saccharinate anion acts as counteranion, out of the coordination sphere. Some comparisons with related structures are made and the most important features of their IR spectra were also discussed.