STUDY OF ENERGY-TRANSFER BETWEEN PORPHYRIN AND CHLORIN GRAFTED ON POLYSTYRENE

Radical copolymerisation of styrene and n-5-(-4-acrylamidophenyl)-10,1 5,20-phenylporphyrin (Zn-ATPP) is reported. The copolymer is character ized using visible, IR, proton and C-13 NMR spectroscopies as well as elemental analysis. In this polymer a nonnegligible amount of Zn-chlor in is present which is titrated using absorption coefficients of Zn-ch lorin prepared as described in literature. Films of different polymers such as polystyrene, statistical polystyrene-co-polyvinylpyridine and a sequenced polymer, poly(vinyl-2-pyridine)-block-polystyrene contain ing the monomer or the radical copolymer are studied. Absorption and f luorescence spectra are studied in solution and in films and compared to the spectra of Zn tetraphenyl porphyrin (Zn-TPP). The energy transf er between porphyrin (P) and chlorin (C) are shown to be dependent on the polarity of the polymer matrix.