Structural, spectroscopic and magnetic properties of diaqua(L-aspartato)nickel(II) hydrate.

The crystal structure of the title compound was determined by X-ray analysis. The compound crystallizes in the orthorhombic space group P212121 with cell dimensions a = 12.306(2), b = 8.996(2), c = 7.596(1) Å, and Z = 4. The structure was solved by the heavy-atom method and refined by least-squares calculations to a final R value of 0.034. The compound is isostructural with the corresponding zinc(II) salt. The structure consists of polymeric linear chains in which the Ni atom is co-ordinated in a distorted octahedral manner by one aspartate ion, acting as a tridentate ligand, by two water molecules, and by one β-carboxylate O atom of a second aspartate ion. Magnetic and spectroscopic results are also discussed.