Substituent effect of 8-quinolinolato ligands on photo-induced isomerization for linear nitrosylruthenium(II) complexes – Experimental study

Abstract cis -1 [RuCl(QN)(QN′)NO] (HQN or HQN′ = 8-quinolinol, 5-chloro-, 5,7-dichloro-, 2-isopropyl-, 2-ethyl-, 2,4-dimethyl- or 2-methyl-8-quinolinol) complexes and the corresponding trans complexes were prepared. The cis -1 to trans and the trans to cis -1 photo-induced isomerizations were carried out to investigate the substituent effect of the 8-quinolinolato ligands on the isomerization and to elucidate the mechanism. The molar ratio of trans to cis -1 isomer for the isomerization was compared among [RuCl(QN)(QN′)NO], [RuCl(QN′) 2 NO] and [RuCl(QN) 2 NO]. The results clearly indicate that the chloro group and bulkiness of the alkyl group in the 8-quinolinolato ligands influence on the isomerization.