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001-es BibID:	BIBFORM087687
Első szerző:	Laurenczy Gábor
Cím:	Formation and characterization of water-soluble hydrido-ruthenium(II) complexes of 1,3,5-triaza-7-phosphaadamantane and their catalytic activity in hydrogenation of CO2 and HCO3- in aqueous solution / Gábor Laurenczy, Ferenc Joó, Levente Nádasdi
Dátum:	2000
ISSN:	0020-1669 1520-510X
Megjegyzések:	The water-soluble tertiary phosphine complex of ruthenium(II), [RuCl2(PTA)4], (PTA ) 1,3,5-triaza-7phosphaadamantane) was used as catalyst precursor for hydrogenation of CO2 and bicarbonate in aqueous solution, in the absence of amine or other additives, under mild conditions. Reaction of [RuCl2(PTA)4] and H2 (60 bar) gives the hydrides [RuH2(PTA)4] (at pH ) 12.0) and [RuH(PTA)4X] (X ) Cl- or H2O) (at pH ) 2.0). In presence of excess PTA, formation of the unparalleled cationic pentakis-phosphino species, [HRu(PTA)5]+, was unambiguously established by 1H and 31P NMR measurements. The same hydrides were observed when [Ru(H2O)6][tos]2 (tos ) toluene-4-sulfonate) reacted with PTA under H2 pressure. The rate of CO2 hydrogenation strongly depends on the pH. The highest initial reaction rate (TOF ) 807.3 h-1) was determined for a 10% HCO3-/90% CO2 mixture (pH ) 5.86), whereas the reduction was very slow both at low and high pH (CO2 and Na2CO3 solutions, respectively). 1H and 31P NMR studies together with the kinetic measurements suggested that HCO3- was the real substrate and [RuH(PTA)4X] the catalytically active hydride species in this reaction. Hydrogenation of HCO3- showed an induction period which could be ascribed to the slow formation of the catalytically active hydride species.
Tárgyszavak:	Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk
Megjelenés:	Inorganic Chemistry. - 39 : 22 (2000), p. 5083-5088. -
További szerzők:	Joó Ferenc (1949-) (vegyész) Nádasdi Levente (1969-) (vegyész)
Pályázati támogatás:	T029934 OTKA F023159 OTKA
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