Synthesis, crystal structure, and magnetic properties of μ-phenoxo/μ-carboxylato-bridged trinuclear nickel(II) complexes withSchiff base, dmf, and urea ligands

摘要

Two new μ-phenoxo/μ-carboxylato-bridged trinuclear nickel(II) complexes,[Ni_3(HL~1)_2(μ_2-1,3-CH_3CO_2)_2(urea)_2](CH_3OH)_2(1) and [Ni_3(HL~2)_2(μ_2-1,3-HCO_2)_dmf)_2](dmf)_2 (2) H_3L~1= 1,3-bis(salicylideneamino)-2-propanol), H_3L~2= 1,3-bis(5-Br-salicylideneamino)-2-propanol) were prepared and characterized. TheX-ray structures analysis of 1 and 2 revealed that three Ni(II) atoms are symmetrically linked by μ-phen-oxo/μ-carboxylato bridges to form linear trinuclear complexes. The temperature dependence of magneticsusceptibility measurements show that complexes 1 and 2 have a weak antiferromagnetically coupling. Fitas linear three nuclear arrangement gave parameters ofJ = -1.70 cm~(-1),g =2.09, andD =1.84 cm~(-1)for 1andJ = -2.78 cm~(-1)