Photochemical properties of cationic pyrene derivative and energy transfer reaction between pyrene and porphyrin on the clay surface

摘要

1,6-di(Af-methyl-pyridinium-3-yl)-pyrene(m-Py(~(2+))) was synthesized. Photochemical properties were observed for m-Py(~(2+)) itself and m-Py(~(2+))/clay complexes. Judging from Lambert-Beer plot analysis, m-Py(~(2+)) molecules adsorb on the clay surface without aggregation up to 60 % versus cation exchange capacity of the clay. m-Py(~(2+)) molecule emits fluorescence from excimer on the clay surface. An energy transfer reaction from excited singlet m-Py(~(2+)) to the ground-state p-TMPyP on the clay surface was examined. The maximum energy transfer efficiency was 13 %. These findings indicate that pyrene derivative is expected as energy donor which can absorb shorter wavelength light in the visible region towards the establishment of artificial light-harvesting system.