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Synthesis and Characterization of Two Novel Mixed-Valent and Metal Oxo-Centered Trinuclear Complexes [Fe2CoO(CHCl2COO)6(py)3] and [Mn2MnO(CHCl2COO)6(py)3]

Yazdanbakhsh M., Tavakkoli H.

Polish Journal of Chemistry

2008

Vol. 82, nr 8

1519--1525

Two novel mi3-oxo trinuclear complexes, [Fe2CoO(CHCl2COO)6(py)3] (1) and [Mn2MnO(CHCl2COO)6(py)3] (2) have been synthesized and characterized by IR spectroscopy, elemental analysis, UV-Vis spectroscopy and atomic absorption spectroscopy. Complexes 1 and 2 are mi3-oxo trinuclear compounds with the three metal atoms bridged by six dichloroacetates groups. M3O and MO4 units adopted D3h and D4h local symmetry, respectively, and are surrounded by six bridging dichloroacetates with C2ypsilon local symmetry.

Synthesis, Spectral and Antiferromagnetic Interaction in Oxalato-Bridged Linear TRinuclear Oxovanadium(IV) Complexes

Li Y., Yan C., Guan H.

Polish Journal of Chemistry

2004

Vol. 78 / nr 2

187-194

Three new linear trinuclear oxovanadium(IV) complexes bridged by oxalato (ox) and end-capped with 2,2_-bipyridine (bpy); 1,10-phenanthroline (phen) or 5-nitro-1,10- phenanthroline (NO2phen); respectively, namely [(VO)3(ox)2(bpy)2]SO4 (1), [(VO)3(ox)2(phen)2]SO4 (2) and [(VO)3(ox)2(NO2phen)2]SO4 (3), have been synthesized and characterized by elemental analyses, molar conductivity, magnetic measurements, IR, ESR and electronic spectral studies. It is proposed that these complexes have extended ox-bridged structures, consisting of three oxovanadium(IV) ions, each in a distorted square-pyramidal environment. Variable-temperature magnetic susceptibility measurements (4.2~300 K) of the complexes (1) and (2) revealed the occurrence of an intramolecular antiferromagnetic interaction between the oxovanadium(IV) ions through the oxalato-bridge within each molecule. The magnetic data have been also used to deduce the indicated structure. On the basis of spin Hamiltonian operator, _ _ _ H = 2J(S S S_ S_ ) 1 2 2 3 Ĺ + Ĺ , the magnetic analyses were carried out for the two trinuclear complexes and the spin-coupling constants (J) were evaluated as -9.85 cm-1 for (1) and -10.16 cm-1 for (2).