Synthesis and spectroscopic properties of some new seven-coordinate thioacetamide complexes of molybdenum(II) and tungsten(II) |
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| Affiliation: | 1. Laboratory of Organic Synthesis, Extraction, and Valorization, Faculty of Sciences Ain Chock, Hassan II University, BP: 5366, Casablanca, Morocco;2. Laboratory of immunology and biodiversity, Faculty of Sciences Ain Chock, Hassan II University, BP: 5366, Casablanca, Morocco |
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| Abstract: | The compounds [MI2(CO)3(NCMe)2] (M = Mo or W) react with one equivalent of SC(NH2)Me in CH2Cl2 at room temperature to initially give the acetonitrile substituted products [MI2(CO)3(NCMe)- {SC(NH2)Me}] which was isolated for M = W. However, the molybdenum complex rapidly dimerizes with loss of acetonitrile to give the iodide-bridged compound [Mo(σ-I)I(CO)3 {SC(NH2)Me}]2. The tungsten complex does not appear to dimerize, even after stirring at room temperature for 72 h in CH2Cl2. Two equivalents of thioacetamide react with [MI2- (CO)3(NCMe)2] in CH2Cl2 at room temperature to give the new bisthioacetamide compounds [MI2- (CO)3{SC(NH2)Me}2] via displacement of the labile acetonitrile ligands. The low temperature (−70 °C) 13C NMR spectrum of [WI2(CO)3{SC(NH2)Me}2] indicates that the geometry of the complex is capped octahedral with a carbonyl ligand in the unique capping position. |
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