Synthesis, reactivity and crystal structures of platinum (II) and platinum (IV) cyclometallated compounds derived from 2- and 4-biphenylimines |
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Authors: | Margarita Crespo Mercè Font-Bardía |
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Institution: | a Departament de Química Inorgànica, Universitat de Barcelona, Diagonal 647, 08028 Barcelona, Spain b Departament de Cristal·lografia, Mineralogia i Dipòsits Minerals, Universitat de Barcelona, Martíi Franquès s/n, 08028 Barcelona, Spain |
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Abstract: | The reaction of Pt2Me4(μ-SMe2)2] with ligands 4-C6H5C6H4CHNCH2CH2NMe2 (1a) and 2-C6H5C6H4CHNCH2CH2NMe2 (1b) carried out in acetone at room temperature produced compounds PtMe2{4-C6H5C6H4CHNCH2CH2NMe2}] (2a) and PtMe2{2-C6H5C6H4CHNCH2CH2NMe2}] (2b), respectively, in which the imines act as bidentate N,N′] ligands. Cyclometallated C,N,N′] compounds PtMe{4-C6H5C6H3CHNCH2CH2NMe2}] (3a) and PtMe{2-C6H5C6H3CHNCH2CH2NMe2}] (3b), were obtained by refluxing toluene solutions of compounds 2a or 2b. Reaction of Pt2Me4(μ-SMe2)2] with ligands 4-C6H5C6H4CHNCH2Ph (1c) and 2-C6H5C6H4CHNCH2Ph (1d) produced compounds PtMe{4-C6H5C6H3CHNCH2Ph}SMe2] (5c) and PtMe{2-C6H5C6H3CHNCH2Ph}SMe2] (5d) containing a C,N] ligand, from which triphenylphosphine derivatives 6c and 6d were also prepared. In all cases, metallation took place to yield five-membered endo-metallacycles and formation of seven-membered or of exo-metallacycles was not observed. The reactions of 3a, 3b, 6c and 6d with methyl iodide were studied in acetone and gave the corresponding cyclometallated platinum (IV) compounds. All compounds were characterised by NMR spectroscopy and compounds 3b, 4a, 6c and 6d were also characterised crystallographically. |
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Keywords: | Platinum Imines Biphenyl Cyclometallation Crystal structure |
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