High density adsorption of porphyrins onto clay layer without aggregation: Characterization of smectite-cationic porphyrin complex

Adsorption of the +4 charged cationic porphyrins onto an artificially synthesized smectite was studied. Porphyrin molecules adsorb on the clay sheet with high density to neutralize all the minus charges of the clay surface without aggregation by a novel method of a size-matching of distances between the charge sites. An efficient energy transfer between different porphyrins was induced on the clay surface, while there was no interaction in the ground state.