63251-05-8Relevant academic research and scientific papers
Photochemical reactions of trans-[Ru(NH3)4L(NO)] 3+ complexes
Carlos, Rose M.,Ferro, Alessander A.,Silva, Hildo A.S.,Gomes, Maria G.,Borges, Simone S.S.,Ford, Peter C.,Tfouni, Elia,Franco, Douglas W.
, p. 1381 - 1388 (2008/10/09)
The photochemical behavior of a series of trans-[Ru(NH3) 4L(NO)]3+ complexes, where L=nitrogen bound imidazole, L-histidine, 4-picoline, pyridine, nicotinamide, pyrazine, 4-acetylpyridine, or triethylphosphite is reported. In addition to ligand localized absorption bands (π→NO) charge transfer (MLCT) transitions. Irradiation of aqueous solutions of these complexes with near-UV light (300-370 nm) labilizes NO, i.e.,trans-[Ru(NH3)4L(NO)] 3+→hν[Ru(NH3)4L(H2O)] 3++NOQuantum yields for [Ru(NH3)4L(H 2O)]3+ formation (φRu(III)) are sensitive to the natures of L, λirr and pH. The lowest quantum yields (λirr=310 nm) were found for L = imidazole (0.03) and L-histidine (0.04), while much higher values were found for L=P(OEt) 3 (0.30). Irradiation at longer wavelengths does not induce photochemical reactivity. These results are interpreted in terms of the expected reactivities of dπ→NO MLCT state in these systems.
