| Abstract: | Two new N3-bridged dinuclear nickel(Ⅱ) complexes, [Ni(ddqx)2 (µ(subscript 1,3)-N3)]2(ClO4)2⋅8CH3OH 1 and [Ni(tpd)(µ(subscript 1,1)-N3)(H2O)]2 2, (ddqx=2,6-dimethyl-2,3-bis(2-pyridyl)quinoxaline and Htpd=4-terpyridone=2,6-bis(2-pyridyl)-4(1H)-pyridone), have been synthesized. Complex 1 crystallizes in the orthorhombic system with Ccca space group; the structure consists of isolated dimer and each Ni(Ⅱ) atom is coordinated by two bidentate ddqx ligands and two end-to-end µ(subscript 1,3)-N3 groups. Complex 2 crystallizes in monoclinic P2(subscript 1)/n space group; the structure consists of hydrogen-bonding linked 2-D chain of dinuclear Ni(Ⅱ) complex, and each Ni(Ⅱ) atom is coordinated by tridentate tpd ligand, water molecule and bridging µ(subscript 1,1)-N3 ligand; the hydrogen bonding formed between the hydrogen atom of H2O and oxygen atom of tpd ligand. Magnetic susceptibility data, measured from 2-300 K, reveal that complex 1 exhibits antiferromagnetic interaction with J=-29 cm^(-1), D=10 cm^(-1), g=2.0, whereas complex 2 exhibits ferromagnetic interaction with J=17 cm^(-1), D=-8.5 cm^(-1), g=2.18. The magneto-structural correlation has been discussed. |
