Synthesis, characterization and structure of a new dinickel(II) complex as model for urease

A new dinuclear nickel(II) complex [Ni2(L)(OAc)2(H2O)]·ClO4·H2O 1 with the unsymmetrical N5O donor ligand 2-{[bis(2- pyridylmethyl)amino]methyl}-4-methyl-6-{[2-pyridylmethyl)amino]methyl}phenol (HL) has been synthesized and characterized by conductivity, UV–Vis–NIR and IR spectroscopy, electrochemical methods and X-ray crystallography. Complex 1 crystallizes as blue crystals in monoclinic crystal system, space group I2=a with a ¼ 21.171(4) A ° , b ¼ 12.147(2) A ° , c ¼ 29.771(6) A ° , b ¼ 99.67(3)8, V ¼ 7547(2) A ° 3 and Z ¼ 8: In this complex both nickel ions have a distorted octahedral geometry. The nickel centers are endogenously bridged by the phenolic oxygen atom of the deprotonated ligand and also bridged by the two acetate groups as exogenous bridge. A water molecule as terminal ligand is coordinated to a NiII ion. q 2003 Elsevier B.V. All rights reserved