. . . "otoreactor and a wavelength-selective sensitizer; wherein the modified photoreactor is represented by the following formula: ##STR24## wherein R1 is hydrogen, an alkane, an alkene, or an aryl group; wherein R2 is hydrogen, an alkane, an alkene, or an aryl group;wherein R3 is hydrogen, an alkane, an alkene, or an aryl group; and wherein R4 is an aryl, or substituted aryl group. 6." .