A novel guanidine-derived ligand with three tetradentate N4 coordination sites and its trinuclear copper and nickel complexes,[Cu3]and[Ni3],were synthesized.X-ray structural analyses of[Cu3]and[Ni3]reveal the complexe...A novel guanidine-derived ligand with three tetradentate N4 coordination sites and its trinuclear copper and nickel complexes,[Cu3]and[Ni3],were synthesized.X-ray structural analyses of[Cu3]and[Ni3]reveal the complexes to have planar triangular structures with pseudo C3 symmetry.Magnetic measurements for[Cu3]and[Ni3]complexes indicate that antiferromagnetic interactions are operative in both complexes with intratriangle exchange coupling constants of g=2.08(1),J=-130(1)cm^(-1)for[Cu_(3)],and g=2.18(1),J=-14.9(1)cm^(-1)for[Ni_(3)].[Cu_(3)]has a doublet spin ground state at low temperature,while the magnetic susceptibility data and magnetization curve suggest that the ground state of[Ni3]is spin singlet.展开更多
基金supported by a Grant-in-Aid for Scientific Research(A)and(C)(no.25248014 and no.26410065)from the Japan Society for the Promotion of Science(JSPS).
文摘A novel guanidine-derived ligand with three tetradentate N4 coordination sites and its trinuclear copper and nickel complexes,[Cu3]and[Ni3],were synthesized.X-ray structural analyses of[Cu3]and[Ni3]reveal the complexes to have planar triangular structures with pseudo C3 symmetry.Magnetic measurements for[Cu3]and[Ni3]complexes indicate that antiferromagnetic interactions are operative in both complexes with intratriangle exchange coupling constants of g=2.08(1),J=-130(1)cm^(-1)for[Cu_(3)],and g=2.18(1),J=-14.9(1)cm^(-1)for[Ni_(3)].[Cu_(3)]has a doublet spin ground state at low temperature,while the magnetic susceptibility data and magnetization curve suggest that the ground state of[Ni3]is spin singlet.
