Synthesis and crystal structure of a novel tri-nickel cluster possessing different conformational metal centers: Five- and six-coordinated geometry

摘要

A novel tri-nickel cluster, {[NiL](2)(OAc)(2)Ni}, has been synthesized by the reaction of nickel(II) acetate tetrahydrate with a novel Salen-type bisoxime chelating ligand, 5,5 '-Di(N,N '-diethylamino)-2,2 '-[ethylenedioxybis(nitrilomethylidyne)]diphenol (H2L). The X-ray crystal structure of the cluster reveals that two acetate ions coordinate to three nickel ions through Ni-O-C-O-Ni bridges and quadruple mu-phenoxo oxygen atoms from two [NiL] chelates also coordinate to nickel ion. Interestingly, the cluster possessing different conformational metal centers: five- and six-coordinated geometry.