Reversible addition of carbon dioxide to rhodium and iridium complexes

Abstract
Crystalline trans-[M(OH)(CO)(Ph3P)2](M = Rh, Ir) reacts with CO2 under normal conditions to form addition compounds, [(CO2)M(OH)(CO)(Ph3P)2], which, on pumping, release carbon dioxide and revert to the starting hydroxo complexes; the vibrational spectra of the bound CO2 indicate a substantial lowering of symmetry and bond order from those of the free molecule.

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