Photochemically and photoelectrochemically active copolymer poly[styrene-co-3-(acrylamido)-6-aminoacridine] (PS-AA) has been synthesized. The absorption properties of this copolymer (PS-AA) are dependent on the acidity of the medium as it can exist in neutral and singly and doubly protonated forms in solution. The excited singlet and triplet state properties of PS-AA are very similar at different acidities, indicating thereby the singly protonated species is the only dominant Species that is responsible for excited-state emission. The fluorescence and triplet quantum yields are 0.16 +/- 0.03 and 0.22 +/- 0.06, respectively. The feasibility of employing these polymer films as photosensitive electrode materials has been demonstrated. A photon-to-photocurrent conversion efficiency (IPCE) of <1% has been observed with a PS-AA-coated nanocrystalline SnO2 film.