Chelate ring size and effect of N-substituents as limiting factors for the formation of cationic chloro-diamine-η2-ethene-platinum(II) complexes |
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| Authors: | Carla Bisi-Castellani Luciana Maresca Giovanni Natile |
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| Affiliation: | Dipartimento di Chimica Generale ed Inorganica, viale Tamarelli 12, 27100 Pavia, Italy;Dipartimento di Chimica, Dorsoduro 2137, 30123 Venice, Italy;Dipartimento Farmaco-Chimico, via G. Amendola 173, 70126 Bari, Italy |
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| Abstract: | The nature of the diamine plays a very critical role in stabilizing the cationic species [Pt(η2-C2H4)Cl(diamine)]+ containing a highly reactive olefin. Hence while N,N,N′,N′-tetramethyl-1,2-diaminoethane (tmen) gave a species isolatable in a pure form, N,N,N′,N′-tetramethyl-1,3-diaminopropane (tmpm) and unsubstituted 1,2-diaminoethane (en) were unable to act as bidentate and gave, as isolatable species, only complexes of the type cis-[Pt(η2-C2H4)Cl2(Hdiamine)]+ in which the diamine is protonated and acts as monodentate towards platinum. These results are explained in terms of greater conformational stability of five- versus six-membered chelate rings and of gem-dimethyl substituted towards unsubstituted ring systems (Thorpe-Ingold effect). |
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| Keywords: | Author to whom correspondence should be addressed. |
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