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The effect of cations(H +,Li +,Na + and K +) on the J aggregation of tetrakis( p sulfonatophenyl) porphyrin diacid (H 2+ 4TSPP 4- ) was studied by UV Vis absorption spectra.It was demonstrated that the presence of these cations promotes the J aggregation of H 2+ 4TSPP,implying that the external cations are necessary to balance the Coulomb repulsion between the sulfonate groups of adjacent H 2+ 4TSPP 4- molecules in the J aggregate.The excitionic energy of the J aggregate was evaluated under the dipole dipole interaction,which is qualitatively consistent with the experimental result.The results support the staircase structural model of the aggregate.
The effect of cations (H +, Li +, Na + and K +) on the J aggregation of tetrakis (p sulfonatophenyl) porphyrin diacid (H 2+ 4TSPP 4-) was studied by UV Vis absorption spectra. It was demonstrated that the presence of these cations promotes the J aggregation of H 2+ 4TSPP, implying that the external cations are necessary to balance the Coulomb repulsion between the sulfonate groups of adjacent H 2+ 4TSPP 4 molecules in the J aggregate. the excitionic energy of the J aggregate was evaluated under the dipole dipole interaction, which is qualitatively consistent with the experimental result. The results support the staircase structural model of the aggregate.