Timor Baasov

A blue shift of protonated retinal schiff base. A model study for bacteriorhodopsin

Abstract A blue shift was observed in the absorption maxima of protonated retinal Schiff base. The shift is due to electrostatic interaction of a non-conjugated positive charge, located in the vicinity of the ionone moiety, with the polyene chromophore.

A remarkable blue shift of retinal protonated Schiff base due to electrostatic interaction of positive charges

The absorption maxima of retinyl iminium polyene are more strongly affected by non-conjugated positive charge located in the vicinity of the β-ionyl moiety (2) than by those located in the vicinity of carbon atoms 12–14(1).