| Abstract
| - The bis(dihydrogen) complex RuH2(H2)2(PCy3)2 (1) reacts with 2-phenyl-3,4-dimethylphosphaferrocene (L1) togive RuH2(H2)(PCy3)2(L1) (2). This dihydride−dihydrogen complex has been characterized by X-ray crystallographyand variable-temperature 1H and 31P NMR spectroscopy. The exchange between the dihydrogen ligand and thetwo hydrides is characterized by a ΔG⧧ of 46.2 kJ/mol at 263 K. H/D exchange is readily observed when heatinga C7D8 solution of 2 (JH-D = 30 Hz). The H2 ligand in 2 can be displaced by ethylene or carbon monoxideleading to the corresponding ethylene or carbonyl complexes. The reaction of 1 with 2 equiv of 3,4-dimethylphosphaferrocene (L2) yields the dihydride complex RuH2(PCy3)2(L2)2 (5).
- The bis(dihydrogen) complex RuH2(H2)2(PCy3)2 reacts with 2-phenyl-3,4-dimethylphosphaferrocene (L1) and 3,4-dimethylphosphaferrocene (L2) to give the dihydride−dihydrogen complex RuH2(H2)(PCy3)2(L1) and the dihydride complex RuH2(PCy3)2(L2)2, respectively.
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