Summary Fluorescence of the title dye is quenched by iron(I1) in water with concomitant photoreduction via a mechanism which does not involve significant induced intersystem crossing by the quencher. ... IN a photogalvanic cell' the electroactive species are afford higher voltages and greater power output by avoiding generated by a photochemical electron-transfer reaction energy lost through intersystem crossing (ISC) . The title ... Published on 01 January 1981. ...