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Acidity And Photolability Of Ruthenium Salen Nitrosyl And Aquo Complexes In Aqueous Solutions

Jeane Bordini, D. Novaes, I. Borissevitch, B. T. Owens, P. Ford, E. Tfouni
Published 2008 · Chemistry

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Abstract The photochemical behavior of nitrosyl complexes Ru(salen)(NO)(OH 2 ) + and Ru(salen)(NO)Cl (salen = N,N′-ethylenebis-(salicylideneiminato) dianion) in aqueous solution is described. Irradiation with light in the 350–450 nm range resulted in nitric oxide (NO) release from both. For Ru(salen)(NO)Cl secondary photoreactions also resulted in chloride aquation. Thus, in both cases the final photoproduct is the diaquo cation Ru III ( salen ) ( OH 2 ) 2 + , for which p K a ’s of 5.9 and 9.1 were determined for the coordinated waters. The p K a of the Ru(salen)(NO)(OH 2 ) + cation was also determined as 4.5 ± 0.1, and the relative acidities of these ruthenium aquo units are discussed in the context of the bonding interactions between Ru(III) and NO.
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