Reactions of 2-thiopyridone and related N-, S- and C-methylated derivatives with [Rh2Cl2(CO)4]: crystal and molecular structure of fac-[Rh(MeC5H3NS)3] containing 6-methyl-2-thiopyridonato ligands |
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| Affiliation: | 1. Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, United States;2. Department of Chemistry, Brandeis University, Waltham, MA 02453, United States;1. Department of Physics, Government College for Women, Kolar-563101 Karnataka, India;2. Department of Physics, Government First Grade College, Kolar-563101 Karnataka, India;1. Secció de Química Inorgànica, Departament de Química Inorgànica i orgànica, Facultat de Química, Universitat de Barcelona, C/Martí i Franqués 1-11, Barcelona 08028, Spain;2. Institut de Nanociència i Nanotecnologia (IN2UB), Universitat de Barcelona, C/Martí i Franqués 1-11, Barcelona 08028, Spain |
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| Abstract: | [Rh2Cl2(CO)4] reacts with the ligands L (2-pyridone, 2-thiopyridone, and the isomers 6-methyl-2-thiopyridone, 2-methylmercaptopyridine, and N-methylthiopyridone) to give initially, when L/Rh = 1, the bridged-cleaved compounds cis- [RhCl(CO)2L]. Further additions of 2-methyl- mercaptopyridine, N-methylthiopyridone, or 2-pyridone caused no further change, but 2- thiopyridone and 6-methyl-2-thiopyridone gave new cis-dicarbonyl species (L/Rh = 2) and eventually monocarbonyl species (L/Rh > 3). All these solutions are air-sensitive and air oxidation of a solution of [Rh2Cl2(CO)4] with an excess of 6-methyl-2- thiopyridone gave fac-[Rh(MeC5H3NS)3] the X-ray structure of which shows three equivalent chelating 6-methyl-2-thiopyridonato ligands. |
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