A ferromagnetic tetranuclear nickel(II) Schiff-base complex with an asymmetric Ni4O4 cubane core

作者：Saha Sudeshna; Pal Souvik; Gomez Garcia Carlos J; Clemente Juan Juan M; Harms Klaus; Nayek Hari Pada^*

来源：Polyhedron, 2014, 74: 1-5.

DOI：10.1016/j.poly.2014.02.036

• Nickel(II) complex
• Schiff base ligands
• Ni4O4 cubane
• Ferromagnetic interaction
• Solid-state structure

The ferromagnetic tetranuclear nickel(II) complex [Ni-4(L)(4)(CH3OH)(2)]center dot 2MeOH center dot 8H(2)O (1) has been synthesized by reacting nickel nitrate hexahydrate with the Schiff base ligand H2L (H2L = N-(2-hydroxyphenyl)3-methoxy-salicylideneamine). Complex 1 was characterized by analytical, thermogravimetric, optical and magnetic techniques. The solid state structure of 1 was established by single crystal X-ray diffraction analysis. Crystal structure determination shows the formation of a distorted Ni4O4 cubane moiety encapsulated by four Schiff base ligands. Compound 1 crystallizes in the triclinic space group P (1) over bar with a = 12.7624(9) angstrom, b = 15.0477(9) angstrom, c = 16.8589(10) angstrom, alpha = 94.732(2)degrees, beta = 94.308(2)degrees, gamma = 99.136(2)degrees and Z = 2. The magnetic properties of complex 1 show a predominant ferromagnetic coupling inside the Ni4 cluster with g = 2.240, J(1) = +0.88 cm(-1), J(2) = +0.84 cm(-1), J(3) = 0.014 cm(-1), J(4) = +1.22 cm(-1) and D = 9.6 cm(-1).

• 出版日期2014-5-28