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Issue 2, 2013
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Classical and non-classical phosphine-Ru(II)-hydrides in aqueous solutions: many, various, and useful

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Abstract

Hydrogenation of the water-soluble [{RuCl2(mtppms)2}2] (mtppms = monosulfonated triphenylphosphine) was studied in aqueous solutions in the presence of excess mtppms both with H2 and with aqueous HCOONa. Depending on the reductant, the pH and H2 pressure altogether nine hydride species were identified. In acidic solutions at 1 bar H2 pressure the known [RuHCl(mtppms)3] (1) and [{RuHCl(mtppms)2}2] (3) were formed, however, elevated pressure led to the formation of trans-[RuH2(mtppms)4] (11). In basic solutions at atmospheric pressure cis-fac-[RuH2(H2O)(mtppms)3] (12) was observed which was readily replaced by [RuH22-H2)(mtppms)3] (13) at higher H2 pressures. 13 is the first water-soluble and stable η2-H2 Ru(II)-complex stabilized only by monodentate phosphine ligands. [RuHBr(mtppms)3] (9) and [RuHI(mtppms)3] (10) were obtained analogously to 1. In concentrated aqueous HCOONa solutions (often used in H-transfer hydrogenations) the major species was trans-[RuH2(HCOO)(mtppms)] (14) while in dilute solutions trans-[RuH2(H2O)(mtppms)3] (15) could be observed. Formation of these various hydride species offers an explanation for the earlier observed pH and pressure dependence of the rates and selectivities in hydrogenation of unsaturated aldehydes catalyzed by [{RuCl2(mtppms)2}2] + mtppms.

Graphical abstract: Classical and non-classical phosphine-Ru(ii)-hydrides in aqueous solutions: many, various, and useful

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Publication details

The article was received on 06 Aug 2012, accepted on 14 Sep 2012 and first published on 18 Sep 2012


Article type: Paper
DOI: 10.1039/C2DT31793A
Citation: Dalton Trans., 2013,42, 521-529
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    Classical and non-classical phosphine-Ru(II)-hydrides in aqueous solutions: many, various, and useful

    G. Papp, H. Horváth, G. Laurenczy, I. Szatmári, Á. Kathó and F. Joó, Dalton Trans., 2013, 42, 521
    DOI: 10.1039/C2DT31793A

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