Photolysis of [Ru(bipy)2(NO)Cl](PF6)2 in frozen ionic glass matrices. Evidence for nitrosyl linkage isomerism and NO-loss in a physiologically relevant nitric oxide source

Photolysis of [Ru(bipy)2(NO)Cl](PF6)2 and its 15NO isotopomer in frozen butyl, methylimidazole (bmim) PF6 glass at ca. 90 K results in appearance of bands characteristic of isonitrosyl and side-on nitrosyl linkage isomers. In addition, weak bands corresponding to free NO in the matrix are also observed. These observations suggest that weakly bound linkage isomers of nitric oxide are likely intermediates in the photolytic release of NO in this and other physiologically relevant NO sources.