The adsorption orientation behavior of tetrakis(1-methylpyridinium-3-yl)porphyrin (m-TMPyP) and tetrakis(1-methylpyridinium-4-yl)porphyrin (p-TMPyP) on the clay monolayer prepared by the Langmuir Blodgett (LB) technique was investigated using the absorption and dichroic spectra obtained on a waveguide. It was revealed that the orientation ofm-TMPyP andp-TMPyP on the clay monolayer, that is parallel and tilted with respect to the clay surface, depends on the surrounding environments such as water andN,N-dimethylformamide (DMF). The anisotropic photochemical energy transfer betweenm-TMPyP as a donor andp-TMPyP as an acceptor in the layered system was investigated in water and in DMF-water (9/1 (v/v)) by a fluorescence observation. As a result, while energy transfer efficiency (eta(ET)) was 60% for the parallel-parallel orientation in water, that was 10% for the tilted-tilted orientation in DMF-water (9/1 (v/v)). The major factor for the change of eta(ET)could be a change of the distance betweenm-TMPyP andp-TMPyP, and theJvalue that is a parameter for spectral overlap between energy donor's fluorescence and acceptor's absorption.
