Mercury is present in the structure of several heterometallic clusters, usually bridging three or four transition metal centres.1 Heterobimetallic compounds with a single M-Hg bond were prepared in the past, and the simpliest situation is represented by the {HgX} fragment (X = halide or pseudohalide) bonded to a transition metal fragment. Compounds of this type can be obtained following different synthetic approaches, such as the reaction of HgX2 with suitable precursors or the insertion of Hg in a M-X bond. The most common transition metals belong to the Groups 6 - 9, with CO, cyclopentadienide (Cp) and related species as ancillary ligands. Selected examples are the complexes [M(HgX)(Cp)(CO)3] (M = Cr, Mo, W), [M(HgX)(CO)5], (M = Mn, Re), [Fe(HgX)(Cp)(CO)2] and [Co(HgX)(CO)4].2 To the best of our knowledge, the nature of the M-Hg bond was never computationally investigated. In this communication we report the outcomes of DFT calculations on model compounds having general formulae [M(HgX)(Cp)(CO)n] (M = Cr, Mo, W, n = 3; M = Fe, Ru, Os, n = 2; X = Cl, Br, I) and [M(HgX)(CO)n] (M = Mn, Tc, Re, n = 5; M = Co, Rh, Ir, n = 4; X = Cl, Br, I). The nature of the M-Hg bond, the factors affecting the bond strength and the behaviour of {HgX} as Lewis acid or base were studied in detail. 1 E. Rosenberg, K. I. Hardcastle, Comprehensive Organometallic Chemistry II, vol. 10 (1995) 323. 2 S. V. Maslennikov et al., Russ. J. Gen. Chem. 72 (2002) 1495; J. Granifo and M. E. Vargas, J. Organomet. Chem. 408 (1991) 357; M. Cano and J. A. Campo, Polyhedron 10 (1991) 133; R. Kumar et al., J. Organomet. Chem. 323 (1987) 53; J. R. Chipperfield et al., J. Chem. Soc. Dalton Trans. (1977) 485 and references therein.

Computational studies on mercury halides as ligands in organometallic transition complexes

Bortoluzzi M.;Ferraro V.;
2021

Abstract

Mercury is present in the structure of several heterometallic clusters, usually bridging three or four transition metal centres.1 Heterobimetallic compounds with a single M-Hg bond were prepared in the past, and the simpliest situation is represented by the {HgX} fragment (X = halide or pseudohalide) bonded to a transition metal fragment. Compounds of this type can be obtained following different synthetic approaches, such as the reaction of HgX2 with suitable precursors or the insertion of Hg in a M-X bond. The most common transition metals belong to the Groups 6 - 9, with CO, cyclopentadienide (Cp) and related species as ancillary ligands. Selected examples are the complexes [M(HgX)(Cp)(CO)3] (M = Cr, Mo, W), [M(HgX)(CO)5], (M = Mn, Re), [Fe(HgX)(Cp)(CO)2] and [Co(HgX)(CO)4].2 To the best of our knowledge, the nature of the M-Hg bond was never computationally investigated. In this communication we report the outcomes of DFT calculations on model compounds having general formulae [M(HgX)(Cp)(CO)n] (M = Cr, Mo, W, n = 3; M = Fe, Ru, Os, n = 2; X = Cl, Br, I) and [M(HgX)(CO)n] (M = Mn, Tc, Re, n = 5; M = Co, Rh, Ir, n = 4; X = Cl, Br, I). The nature of the M-Hg bond, the factors affecting the bond strength and the behaviour of {HgX} as Lewis acid or base were studied in detail. 1 E. Rosenberg, K. I. Hardcastle, Comprehensive Organometallic Chemistry II, vol. 10 (1995) 323. 2 S. V. Maslennikov et al., Russ. J. Gen. Chem. 72 (2002) 1495; J. Granifo and M. E. Vargas, J. Organomet. Chem. 408 (1991) 357; M. Cano and J. A. Campo, Polyhedron 10 (1991) 133; R. Kumar et al., J. Organomet. Chem. 323 (1987) 53; J. R. Chipperfield et al., J. Chem. Soc. Dalton Trans. (1977) 485 and references therein.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10278/3742617
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