Photoinduced electron transfer quenching and sugar effects on the electrostatic interaction between an anionic Ru(II) complex and cationic bipyridinium derivatives functionalized with boronic acids.

The photoinduced electron transfer quenching of an anionic ruthenium(II) metal-ligand-complex (Ru(dpp(SO3Na))2(mcbpy)Cl2 by two boronic acid functionalized benzyl viologen (BV2+) derivatives has been investigated as well as their response to sugar. The electrostatic interaction between these two charge species lead to the formation of static quenching which is removed in presence of sugar due to the formation of a neutral zwitterionic quencher. Spectral data, quenching parameters and sugar titration curves are presented and discussed in term of future developments of optical sensors for sugar.