Classical and non-classical phosphine-Ru(ii)-hydrides in aqueous solutions

Many, various, and useful

Gábor Papp, Henrietta Horváth, Gábor Laurenczy, Imre Szatmári, A. Kathó, Ferenc Joó

Research output: Contribution to journalArticle

13 Citations (Scopus)

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 H 2 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-[RuH 2(mtppms)4] (11). In basic solutions at atmospheric pressure cis-fac-[RuH2(H2O)(mtppms)3] (12) was observed which was readily replaced by [RuH22-H 2)(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-[RuH 2(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 [{RuCl 2(mtppms)2}2] + mtppms.

Original languageEnglish
Pages (from-to)521-529
Number of pages9
JournalDalton Transactions
Volume42
Issue number2
DOIs
Publication statusPublished - Jan 14 2013

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phosphine
Hydrides
Hydrogenation
Water
Reducing Agents
Aldehydes
Atmospheric pressure
Ligands

ASJC Scopus subject areas

  • Inorganic Chemistry

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Classical and non-classical phosphine-Ru(ii)-hydrides in aqueous solutions : Many, various, and useful. / Papp, Gábor; Horváth, Henrietta; Laurenczy, Gábor; Szatmári, Imre; Kathó, A.; Joó, Ferenc.

In: Dalton Transactions, Vol. 42, No. 2, 14.01.2013, p. 521-529.

Research output: Contribution to journalArticle

Papp, Gábor ; Horváth, Henrietta ; Laurenczy, Gábor ; Szatmári, Imre ; Kathó, A. ; Joó, Ferenc. / Classical and non-classical phosphine-Ru(ii)-hydrides in aqueous solutions : Many, various, and useful. In: Dalton Transactions. 2013 ; Vol. 42, No. 2. pp. 521-529.
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