REVERSIBLE BINDING OF CARBON-MONOXIDE WITH RU(III) AMINOPOLYCARBOXYLIC ACID COMPLEXES

The reversible binding of carbon monoxide to the complexes [Ru(III)(EDTA-H)(H2O)] 1 and [Ru(III)(PDTA-H)(H2O)] 2 have been studied in aqueous solution at pH = 5 by spectrophotometric and electrochemical studies. The equilibrium constant for carbonylation, K(CO) was evaluated at 10-degrees, 25-degrees and 40-degrees-C. The thermodynamic parameters, DELTAH-degrees, DELTAG-degrees and DELTAS-degrees for the carbonylation of the complexes 1 and 2 have been evaluated. The complex [Ru(PDTA-H)(CO)] 4 is more stable than the complex [Ru(EDTA-H)(CO)] 3 in solution.