Antiferro- and Ferromagnetic Behaviors of Two New µ1,3-N3 and µ1,1-N3 Bridged Dinuclear Nickel(II) Complexes with 2,6-Bis(2-pyridyl)-4(1H)-pyridone and 2,6-Dimethyl-2,3-bis (2-pyridyl)quinoxaline Ligands

Chun-Yuan Liao; Ho-Hsiang  Wei; Sheng-Chuan Cheng; Sasankasekhar  Mohanta

doi:10.6180/jase.2002.5.4.01

Antiferro- and Ferromagnetic Behaviors of Two New µ1,3-N3 and µ1,1-N3 Bridged Dinuclear Nickel(II) Complexes with 2,6-Bis(2-pyridyl)-4(1H)-pyridone and 2,6-Dimethyl-2,3-bis (2-pyridyl)quinoxaline Ligands

Chun-Yuan Liao¹, Ho-Hsiang Wei This email address is being protected from spambots. You need JavaScript enabled to view it.¹, Sheng-Chuan Cheng¹ and Sasankasekhar Mohanta¹

¹Department of Chemistry Tamkang University Tamsui, Taiwan 251, R.O.C.

Received: September 9, 2002
Accepted: October 7, 2002
Publication Date: December 1, 2002

Download Citation: ||https://doi.org/10.6180/jase.2002.5.4.01

ABSTRACT

Two new N3-bridged dinuclear nickel(II) complexes, [Ni(ddqx)₂ (µ_1,3-N₃)]₂(ClO₄)₂⋅8CH₃OH 1 and [Ni(tpd)(µ_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 µ1,3-N3 groups. Complex 2 crystallizes in monoclinic P21/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 µ1,1-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.

Keywords: Azide bridged, Dinickel(II), Crystallographic Equivalence, Distortion of Azide Bridge.

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