Interconversion among Anionic Metal Clusters(M=Ru, Os) Formed in the Basic Water Gas Shift Reactions

Abstract

Interconversion among anionic metal clusters(M=Ru, Os) formed in the basic water gas shift reactions has been studied under various conditions by using three kinds of bases, KOH, NEt₃ and DBU(1, 8-diazabicyclo[5.4.0]undece-7-ene). In the Ru-DBU system, [FIRu₃(CO)₁₁]- and [H₂Ru₄(CO)₁₂]^2- were mutually converted. The composition was found by IR spectroscopy to depend oh the relative ratio of the CO and H₂ partial pressure, and no [H₃Ru₄(CO)₁₂]^- was detected. The result is in contrast to the known interconversion between [EIRu₃(CO)₁₁]^- and [H₃Ru₄(CO)₁₂]^2- in the presence of the other bases. [H₂Os₄(CO)₁₂]² formed with DBU was stable when treated with carbon monoxide at 120°C for 5 h.