The pH dependent phase transfer of an organometallic complex:synthesis,characterization,and crystal structure of a W(O)tetracarbonyl with an acidic pyridine-imine ligand

摘要

Reaction of the asymmetrical pyridine-irnine ligand L (where L=benzoic acid,3-[(2-pyridiny1methylene)amino]) with W(CO)_3(EtCN)_3 and CO (g) affords a W(O) tetracarbonyl in which the Schiff-base ligand coordinates in a bidentate fashion.The complex was characterized by IR,NMR,and UV-visible spectroscopy and elemental analysis.The solid-state structure of W(CO)_4(L),which crystallized in the orthorhombic space group Pbca with unit cell parameters a=22.497(4) A,b=14.112(6) A,and c=13.675(3) A was established by X-ray crystallography.Deprotonation of the-CO_2H group on the ligand with base results in the formation of a water-soluble organometallic complex which can be partitioned between organic and aqueous phases in a biphasic system by pH adjustment.