Zucca, Antonio and Maidich, Luca and Carta, Veronica and Petretto, Giacomo Luigi and Stoccoro, Sergio and Cinellu, Maria Agostina and Pilo, Maria Itria and Clarkson, Guy J. (2014) Cyclometalated complexes of platinum(II) with 2-vinylpyridine. European Journal of Inorganic Chemistry, Vol. 2014 (13), p. 2278-2287. eISSN 1099-0682. Article.
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The electron-rich platinum(II) derivatives [Pt(R)2(DMSO)2] (R = Me, Ph) react with 2-vinylpyridine (L) to give the cyclometalated complexes [Pt(L—H)(R)(DMSO)] through C—H bond activation. Cyclometalation also occurs with [Pt(Me)(Cl)(DMSO)2]. From the starting compounds, a series of cyclometalated complexes was obtained and characterised by analytical and spectroscopic methods. The molecular structures of [Pt(L—H)(Me)(PPh3)] and [Pt(L—H)(Ph)(PCy3)] were solved by X-ray diffraction analysis, and the results unambiguously demonstrate cyclometalation of 2-vinylpyridine. The five-membered cyclometalated ring is particularly stable, likely due to partial electronic delocalisation.
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