The importance of an additional water bridge in making the exchange coupling of bis(μ-phenoxo)dinickel(II) complexes ferromagnetic

被引：59

作者：

Biswas, Rituparna ^{[1
]}

Kar, Paramita ^{[1
]}

Song, You ^{[2
]}

Ghosh, Ashutosh ^{[1
]}

机构：

[1] Univ Calcutta, Dept Chem, Univ Coll Sci, Kolkata 700009, India

[2] Nanjing Univ, State Key Lab Coordinat Chem, Nanjing Natl Lab Microstruct Sch Chem & Chem Engn, Nanjing 210093, Peoples R China

来源：

DALTON TRANSACTIONS | 2011年 / 40卷 / 19期

关键词：

DINUCLEAR NICKEL(II) COMPLEXES; MAGNETIC-PROPERTIES; CRYSTAL-STRUCTURES; NI(II) COMPLEXES; MAGNETOSTRUCTURAL CORRELATIONS; STRUCTURAL-CHARACTERIZATION; DINICKEL(II) COMPLEXES; CATALYTIC-ACTIVITIES; SPIN-EXCHANGE; ACTIVE-SITE;

D O I：

10.1039/c0dt01585g

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Two new nickel(II) complexes [Ni2L2(PhCOO)(2)(H2O)] (1), [Ni2L2(PhCH2COO)(2)(H2O)] (2) have been synthesized using a tridentate Schiff base ligand, HL (2-[(3-dimethylamino-propylimino)-methyl]-phenol) and the carboxylate monoanions, benzoate and phenylacetate, respectively. The complexes have been characterized by spectral analysis, variable temperature magnetic susceptibility measurement and crystal structure analysis. The structural analyses reveal that both complexes are dinuclear in which the distorted octahedral Ni2+ ions share a face, bridged by one water molecule and two mu(2)-phenoxo oxygen atoms. A monodentate benzoate or phenylacetate anion and two nitrogen atoms of the chelating deprotonated Schiff base (L) complete the hexa-coordination around the metal ion. Variable-temperature magnetic susceptibility studies indicate the presence of dominant ferromagnetic exchange coupling in complexes 1 and 2 with J values of 11.1(2) and 10.9(2) cm(-1) respectively. An attempt has been made to rationalize the observed magneto-structural behavior considering the importance of the additional water bridge in the present two complexes and also in other similar species.

引用

页码：5324 / 5331

页数：8

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