Magneto-structural study on a series of rhenium(IV) complexes containing biimH2, pyim and bipy ligands |
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Authors: | José Martí nez-Lillo,Donatella Armentano,Giovanni De Munno,Juan Faus |
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Affiliation: | 1. Departamento de Química Inorgánica/Instituto de Ciencia Molecular, Facultad de Química de la Universidad de Valencia, Dr. Moliner 50, 46100 Burjassot, Valencia, Spain;2. Dipartimento di Chimica, Università degli Studi della Calabria, via P. Bucci 14/c, 87030 Arcavacata di Rende, Cosenza, Italy |
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Abstract: | Three rhenium(IV) mononuclear compounds of formulae [ReCl4(biimH2)] · 2DMF (1), [ReCl4(pyim)] · DMF (2) and [ReCl4(bipy)] (3) (biimH2 = 2,2′-biimidazole, pyim = 2-(2′-pyridyl)imidazole, bipy = 2,2′-bipyridine and DMF = N,N-dimethylformamide) have been prepared and characterized. The crystal structure of 2 was determined by single crystal X-ray diffraction. Compound 2 crystallizes in the monoclinic system with P21/c as space group. The rhenium atom is six-coordinated by four Cl atoms and two nitrogen atoms from a bidentate pyim ligand [average values of Re–Cl and Re–N bonds lengths being 2.330(2) and 2.117(4) Å, respectively]. The magnetic properties were investigated from susceptibility measurements performed on polycrystalline samples of 1–3 in the temperature range 1.9–300 K. The magnetic behaviour found is typical of antiferromagnetically coupled systems, and they exhibit susceptibility maxima at 2.8 (1 and 2) and 5.6 K (3). Short ReIV–Cl?Cl–ReIV contacts through space account for the antiferromagnetic behaviour observed. |
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Keywords: | Rhenium(IV) complexes 2,2&prime -Biimidazole 2-(2&prime -Pyridyl)imidazole 2,2&prime -Bipyridine Magnetic properties |
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