Reduction quenching of Ru(bipy)32+ is a new way for photoinitiation of chain reaction of sulfogroup substitution for chlorine in chloronaphthols

The possibility of photochemical initiation of reaction of sulfogroup substitution for chlorine by visible light using a sensitizer by means of substrate ion-radical formation has been studied. It is shown that the reaction mentioned proceeds with the use of [Ru(bipy)3]Cl3 complex as a sensitizer and [Co(bipy)3](ClO4)2 complex as an intermediate electron transferrer. The photoinitiation stage is caused by reduction quenching of excited Ru(bipy)32+ by Co(bipy)32+ complex. Kinetics of substitution reaction is studied, quantum yields are presented. The reaction mechanism is suggested