The new water-soluble ruthenium-nitrosyl complexes [RuCl 3(NO)(TPPMS)2] and [RuCl3(NO)(TPPTS) 2] were synthetized and characterized by IR, 1H and 31P NMR spectroscopies. The NO stretching frequencies, v NO = 1870 cm-1 (TPPMS) and 1883 cm-1 (TPPTS) suggest a linear Ru-N-O arrangements. Reactions with OH- yield the corresponding [RuCl3(NO2)(P)2] derivatives, furthermore, [RuH(NO)(P)3] is formed with TPPMS or TPPTS, respectively, under 100 bar H2 pressure. The new complexes are suitable precatalysts for the hydrogenation of carbon dioxide and/or bicarbonate in aqueous solutions up to a tumover frequency of 400 h -1 under relatively mild conditions (30 bar H2, 70 °C).
- Carbon dioxide
- Nitrosyl complexes
ASJC Scopus subject areas
- Process Chemistry and Technology
- Physical and Theoretical Chemistry