Issue 43, 2011

Anion induced diversification from heptanuclear to tetranuclear clusters: Syntheses, structures and magnetic properties

Abstract

Three new polynuclear complexes, [Co7(bm)12]·(ClO4)2·13H2O (1), [Co4(bm)4Cl4(C3H7OH)4] (2), and [Co4(bm)4(μ-HCO2)22-HCO2)2(C3H7OH)2] (3) (Hbm = (1H-Benzimidazol)-methanol), have been synthesized and characterized by elemental analysis, IR, powder X-ray diffraction and X-ray single-crystal diffraction. Compound 1 features a centrosymmetric wheel-like heptanuclear Co(II) cluster. Compound 2 having a I41/a space group exhibits a tetranuclear Co(II) cluster with a cubane topology in which the central Co(II) ion and oxygen atoms from bm occupy the alternate vertices of the cube. However, compound 3 has a tetranuclear Co(II) cluster with a C2/c space group different from that of compound 2. These results show that the geometries and sizes of the corresponding anions as well as their coordinating and hydrogen-bonding properties are essential in determining the final structures of the assemblies. Magnetic properties of 1–3 in the 2–300 K have also been discussed. The {Co7} (1) and {Co4} (2) cores display dominant ferromagnetic interactions while the {Co4} (3) core displays dominant anti-ferromagnetic interactions.

Graphical abstract: Anion induced diversification from heptanuclear to tetranuclear clusters: Syntheses, structures and magnetic properties

Supplementary files

Article information

Article type
Paper
Submitted
26 Mar 2011
Accepted
20 Jun 2011
First published
10 Aug 2011

Dalton Trans., 2011,40, 11402-11409

Anion induced diversification from heptanuclear to tetranuclear clusters: Syntheses, structures and magnetic properties

S. Zhang, L. Ma, H. Zou, Y. G. Wang, H. Liang and M. H. Zeng, Dalton Trans., 2011, 40, 11402 DOI: 10.1039/C1DT10517E

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