Photochemical NO release from nitrosyl Ru-II complexes with C-bound imidazoles

摘要

The series of nitrosyl complexes trans-[Ru(NH3)(4)L(NO)]Cl-3, L = caffeine, theophylline, imidazole and benzoimidazole in position trans to NO were prepared and their photochemical properties studied. All complexes showed nitric oxide (NO) release under light irradiation at 330-440 nm. Quantum yields for [Ru(NH3)(4)L(H2O)](3+) formation (phi(Ru(III))) were sensitive to the natures of L, lambda(irr) and pH. The major product of the irradiation of trans-[Ru(NH3)(4)L(NO+)](3+) is the trans-[Ru-III(NH3)(4)L(Cl)](2+) and NO as suggested by UV-Vis, electrochemical, and FTIR techniques.