Synthesis, crystal structure and magnetic properties of three polynuclear manganese compounds bearing ferrocenecarboxylato ligands |
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| Authors: | Zilu Chen Fupei Liang Zhaohui Zhou |
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| Institution: | a College of Chemistry and Chemical Engineering, Guangxi Normal University, Yucai Road 15, Guilin 541004, China
b Department of Chemistry, College of Chemistry and Chemical Engineering, State Key Laboratory of Physical Chemistry of Solid Surfaces, Xiamen University, Xiamen 361005, China |
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| Abstract: | The reactions of sodium ferrocenecarboxylate (FcCO2Na) and Mn(ClO4)2 · 6H2O in methanol in the presence of ancillary ligands of 1,10-phenanthroline (phen) or 2,2′-bipyridine (2,2′-bpy) produce three discrete polynuclear complexes bearing ferrocenecarboxylato ligands: Mn2(FcCO2)3(phen)2](ClO4) · 2CH2Cl2 (1), Mn3(FcCO2)6(2,2′-bpy)2] · 2H2O (2) and Mn4O2(FcCO2)7(2,2′-bpy)2]ClO4 · 2CH2Cl2 · 6H2O (3). It is shown that their composition and skeletons are tuned by the ancillary ligands and the ratios of starting materials. In dimanganese complex 1, both Mn(II) ions are pentacoordinated in a distorted trigonal bipyramidal geometry and bridged by three ferrocenecarboxylato ligands in a distorted syn-syn bridging mode, which is rare in triply carboxylato-bridged dimanganese complexes. Compound 2 presents a linear trinuclear Mn3(μ2-η1:η1-O2CFc)4(μ2-η1:η2-O2CFc)2] core, in which six ferrocencarboxylato ligands show two different bridging modes. The cationic Mn4O2 core of 3 has a butterfly structure, in which two Mn(III) ions at “body” sites are bridged by an additional ferrocenecarboxylato ligand and they are further connected to the Mn(III) ions at “wing-tip” sites by ferrocenecarboxylato ligands. Magnetic susceptibilities of 1 and 2 were measured. Both of them mediate a weak antiferromagnetic coupling between the Mn(II) ions bridged by ferrocenecarboxylato ligands. |
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| Keywords: | Manganese Crystal structure Ferrocenecarboxylato Magnetic properties |
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