Ligand substitution in hexahalorhenate(IV) complexes: Synthesis, crystal structures and magnetic properties of NBu4[ReX5(DMF)] (X = Cl and Br) |
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Authors: | José Mart?´nez-Lillo Giovanni De Munno Miguel Julve |
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Institution: | a Departamento de Qu?´mica Inorgánica/Instituto de Ciencia Molecular, Facultad de Qu?´mica de la Universidad de Valencia, Dr. Moliner 50, 46100 Burjassot, Valencia, Spain b Dipartimento di Chimica, Università degli Studi della Calabria, via P. Bucci 14/c, 87030 Arcavacata di Rende, Cosenza, Italy |
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Abstract: | The preparation, crystal structures, and magnetic properties of two rhenium(IV) mononuclear compounds of formula NBu4ReX5(DMF)] with X = Cl (1) and Br (2) are reported. 1 and 2 are isostructural complexes which crystallize in the monoclinic system with the space group P21/n. The rhenium atom is six-coordinated with five X atoms and a DMF molecule forming a somewhat distorted octahedral surrounding values of Re-X varying in the ranges 2.317(1)-2.358(1) (1) and 2.495(1)-2.518(1) Å (2)]. Magnetic susceptibility measurements on samples of 1 and 2 in the temperature range 1.9-300 K are interpreted in terms of magnetically isolated spin quartets with large values of the zero-field-splitting (|2D| is ca. 20.2 and 39.2 cm−1 for 1 and 2, respectively). |
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Keywords: | Rhenium(IV) complexes Crystal structures DMF Magnetic properties |
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