Synthesis, Crystal Structure, and Magnetic Properties of Oxime-Bridged Polynuclear Ni(II) and Cu(II) Complexes

Two new polynuclear complexes [Ni6(amox)6(μ6-O)(μ3-OH)2]Cl2·6H2O and [Cu3(amox)3(μ3-OH)(μ3-Cl)]ClO4·4H2O
(amox- = anion of 4-amino-4-methyl-2-pentanone oxime) have been synthesized and characterized structurally
and magnetically. The Ni(II) complex contains a novel Chinese-lantern-like Ni6 cage centered by an oxo ion. It
contains the nearest octahedral Ni(II)···Ni(II) separation (<2.8 Å) and exhibits strong antiferromagnetic properties.
The Cu(II) complex has a cyclic trinuclear copper(II) core bridged by both μ3-OH- and μ3-Cl- ions. The magnetic
susceptibilities of both antiferromagnetic complexes were fitted by using approximate models.