Extended triple-bridged Ni(II)- and Co(II)-hydroxamate trinuclear complexes:: Synthesis, crystal structures, and magnetic properties

被引：36

作者：

Tomkowicz, Z. ^{[2
]}

Ostrovsky, S. ^{[3
]}

Mueller-Bunz, H. ^{[4
]}

Eltmimi, A. J. Hussein ^{[4
]}

Rams, M. ^{[2
]}

Brown, D. A. ^{[4
]}

Haase, W. ^{[1
]}

机构：

[1] Tech Univ Darmstadt, Eduard Zintl Inst Inorgan & Phys Chem, D-64287 Darmstadt, Germany

[2] Jagiellonian Univ, Inst Phys, PL-30059 Krakow, Poland

[3] Moldavian Acad Sci, Inst Appl Phys, MD-2028 Kishinev, Moldova

[4] Univ Coll Dublin, Convay Inst Biomol & Biomed Res, Ctr Synth & Chem Biol, Dept Chem, Dublin 4, Ireland

来源：

INORGANIC CHEMISTRY | 2008年 / 47卷 / 15期

关键词：

D O I：

10.1021/ic800264y

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Crystal structures of new trinuclear complexes [Ni(3)(mu-OAC(F))(4)(mu-AA)(2)(tmen)(2)], [Ni(3)(mu-OAC(F))(4)(mu-BA)(2)(tmen)(2), and [Co(3)(mu-OAC(F))(4)(mu-BA)(2)(tmen)(2)] have been determined (OAC(F) = CF(3)COO(-), AA = acetohydroxamate anion, BA = benzohydroxamate, anion, tmen = N,N,N',N'-tetramethylethylenediamine). In each structure, the metal ions have distorted octahedral coordination and are triply bridged by one hydroxamate and two trifluoroacetate bridges. Magnetic properties of these compounds and of relative [Co(3)(mu-OAC(F))(4)(mu-AA)(2)(tmen)(2)] were studied by susceptibility and magnetization measurements. It was shown that for nickel trimers the intramolecular magnetic coupling is weak ferromagnetic in the case of the complex with the AA group, and there is nearly no coupling in the case with BA group. Rather large zero field splitting was obtained for the distorted octahedral environments of the terminal nickel ions. The cobalt trimers were additionally studied by magnetic circular dichroism (MCD) measurements. The exchange interaction of the cobalt complexes is antiferromagnetic.

引用

页码：6956 / 6963

页数：8

共 31 条

[1] Dinuclear nickel(II) and zinc(II) complexes of 2,6-bis[{bis(2-pyridylmethyl)amino}methyl]-4-methylphenol [J].