Tuning diastereoisomerism in platinum(ii) phosphino- and aminothiolato hydrido complexes

A. Polo, J. Duran, R. Juanola, J. Real, J. Benet-Buchholz, M. Solà, A. Poater

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Abstract

© The Royal Society of Chemistry and the Centre National de la Recherche Scientifique. Chelate assisted oxidative addition of one equivalent of 2-phosphinothiols (2-(diphenylphosphino)ethanethiol 1, 1-(benzyloxy)-2-(diphenylphosphino)ethanethiol 2 and 2-(diphenylphosphino)-cyclohexanethiol 3) to tetrakis(triphenylphosphine)platinum(0) gives the corresponding hydrido[2-(phosphino-κP)thiolato-κS]triphenylphosphineplatinum(ii) complexes 8-10. Temperature variable NMR studies show that these complexes display a chemical equilibrium between the cis-P,P and trans-P,P geometries, strongly displaced toward the trans-P,P configuration (70-90%). XRD studies carried out on crystals of 8 indicate that although the two geometric isomers are present in solution, only the trans-P,P is obtained in the solid state. These results differ from the cis-P,N geometry observed for the related hydrido[2-(amino-κN)thiolato-κS]triphenylphosphineplatinum(ii) complexes 5-7 in solution. The crystal structures obtained for these aminothiolate hydrides show that the cis-P,N configuration is the only one observed in the solid state. Chelate assisted oxidative addition of one equivalent of 3-(diphenylphosphino)propanethiol 4 to tetrakis(triphenylphosphine)platinum(0) gives the resultant hydrido[3-(phosphino-κP)thiolato-κS]triphenylphosphineplatinum(ii) complex 11. This 3-phosphinothiolate hydride shows in solution only a trans-P,P geometry but presents two chelate ring conformational isomers. Density functional theory calculations have been used to explore the ligand-based stereoelectronic effects that are determinant in the different diastereoisomerism observed in these platinum(ii) hydrides (5-11).
Original languageEnglish
Pages (from-to)3015-3028
JournalNew Journal of Chemistry
Volume41
Issue number8
DOIs
Publication statusPublished - 1 Jan 2017

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    Polo, A., Duran, J., Juanola, R., Real, J., Benet-Buchholz, J., Solà, M., & Poater, A. (2017). Tuning diastereoisomerism in platinum(ii) phosphino- and aminothiolato hydrido complexes. New Journal of Chemistry, 41(8), 3015-3028. https://doi.org/10.1039/C6NJ04042J