Synthesis, structures and magnetic properties of four new oxamidato-bridged heterobimetallic complexes

摘要

Four new heterobimetallic coordination polymers, namely, {[Cu(aeoe)M(H20)3 _ 2H2O12)_ (M = Mn(II) (1), Co(II) (2), Ni(II) (3)) and [Cu(aeoe)Ni(H_20)_3]_2 (4) (H_4aeoe = N'-(2-aminoterephthalic acid)-N"-(ethylenediamine)oxamidato) have been synthesized and characterized structurally. Complexes 1-3 are allomerism and feature 1-D ladder-like chain structure constructed from neutral tetranuclear complex units through the syn-anti carboxylate bridges, whereas complex 4 is a cyclic neutral tetranuclear complex unit. Their magnetic properties are also investigated based on their structures.