New Mn(II)Cu(II)Mn(II) trinuclear complexes with an S=9/2 ground state

MIAO Mingming; CHENG Peng; LIAO DaizhengJIANG ZonghuiWANG Genglin

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New Mn(II)Cu(II)Mn(II) trinuclear complexes with an S=9/2 ground state

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The subject of design and synthesis of molecular-based ferromagnets is one of the main challenges in the field of molecular materials. Along this line, the first important step is synthesizing molecular entities with a large spin in the ground state.Recently, Kahn has pointed out that it is possible for ABA linear trinuclear species with local spins 2S_A>S_B+1/2 to stabilize a state of high-spin multiplicity with no need of imposing ferromagnetic interactions between the nearest neighbor magnetic centers. Several ABA trinuclear complexes with Cu(pba)~(2-) bridge (where pba stands for propylene-1,3-bis (oxamato)) have been reported. However, to our knowledge, no o-phenylene-bis(oxamato) bridged Mn(II)Cu(II)Mn(II) complex has been reported. This note deals with the synthesis and characterization of three new heterotrinuclear complexes, namely {Mn(L)_2_2Cu(ebo)}-(ClO_4)_2 (where ebo = o-phenylene-bis(oxamado), L = 1,10-phenanthroline (phen), 5-nitro-1,10-phenanthroline (NO_2-phen) and 2,2'-bipyridyl (bpy)). The magnetic analysis of {Mn(phen)_2_2Cu(ebo)}(ClO_4)_2-H_2O indicates that there is an antiferromagnetic coupling between manganese(II) and copper(II) ions. The χ_MT versus T plot exhibits a minimum at about 198 K, which is the characteristic of this kind of complex with an irregular spin-state structure.

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来源
《Chinese science bulletin》 |1996年第12期|995-999|共5页
作者
MIAO Mingming; CHENG Peng; LIAO DaizhengJIANG ZonghuiWANG Genglin;
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作者单位

Department of Chemistry, Nankai University, Tianjin 300071, China;

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正文语种英语
中图分类自然科学现状及发展;
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Mn(II)Cu(II)Mn(II); antiferromagnetic coupling; irregular spin state structure;

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机译：Syntheses, structures, and properties of trinuclear complexes M(bpca)(2){M '(hfaC)(2)}(2), constructed with the complexed bridging ligand M(bpca)(2) M, M ' = Ni(II), Mn(II); Cu(II), Mn(II); Fe(II), Mn(II); Ni(II), Fe(II); and Fe(II), Fe(II); hbp
2. Novel Mn~(II)Mn~(III)Mn~(II) Trinuclear Complexes with Carbohydrate Bridges Derived from Seven-Coordinate Manganese(II) Complexes with N-Glycoside [J] . Tanase Tomoaki, Tamakoshi Saori Inorganic Chemistry: A Research Journal that Includes Bioinorganic, Catalytic, Organometallic, Solid-State, and Synthetic Chemistry and Reaction Dynamics . 2000,第4期

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8. Multinational Limited Objective Experiment II (MN LOE II). [R] . 2003

机译：跨国有限公司目标实验II（mN LOE II）。

New Mn(II)Cu(II)Mn(II) trinuclear complexes with an S=9/2 ground state

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