期刊
INORGANICA CHIMICA ACTA
卷 375, 期 1, 页码 263-270出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.ica.2011.05.015
关键词
Cocrystal; Magnetic properties; Tetrametallic; Dimetallic; Self-assembly; Noncovalent interactions
资金
- Department of Science and Technology, the Government of India [SR/S1/IC-12/2008]
- Council for Scientific and Industrial Research
The present work reports syntheses, crystal structures and variable-temperature magnetic properties of three copper(II)-iron(II/III) compounds [{(CuL1)-L-II}{(FeL1)-L-III(H2O)(2)}](ClO4) (1), [{(CuLFeII)-L-II-Fe-1(H2O)(3)}{(CuL1)-L-II}(2)](-ClO4)(2) (2) and [{(CuLFeII)-L-II-Fe-2(H2O)(3)}{(CuL2)-L-II}(2)](ClO4)(2)center dot H2O center dot CH3COCH3 (3), where H2L1 = N,N'-ethylenebis(3-ethoxysalicylaldimine) and H2L2 = N,N'-o-phenylenebis(3-ethoxysalicylaldimine). Compounds 2 and 3 are tetrametallic [2 x 1 + 1 x 2] cocrystals of one diphenoxo-bridged dinuclear (CuFeII)-Fe-II and two mononuclear Cu-II moieties, while compound 1 is a dimetallic [1 x 1 + 1 x 1] cocrystal of one mononuclear Fe-III and one mononuclear CuII moieties. The overall topology of 1 is one-dimensional. Tetrametallic (in 2 and 3) and one-dimensional (in 1) self-assemblies are generated due to weak noncovalent interactions. Variable-temperature magnetic susceptibility measurements reveal that iron(II) or iron(III) centers in 1-3 remain in high-spin state. Compounds 2 and 3 exhibit weak antiferromagnetic interaction; the J values in the dinuclear core are -22.5 and -13.7 cm (1), respectively, compound 1 exhibits very weak antiferromagnetic interaction (J = -0.25 cm (1)) propagated through the weak noncovalent bonds. (C) 2011 Elsevier B.V. All rights reserved.
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