Effect of conformational heterogeneity on excitation energy transfer efficiency in directly meso-meso linked Zn(II) porphyrin arrays

Article Abstract:

The overall excitation energy relaxation dynamics in linear porphyrin arrays and the energy transport phenomena by attaching an energy acceptor to one end of a linear porphyrin array by using steady state and time-resolved spectroscopic measurements are investigated. It is revealed that the solvation dynamics and conformational dynamics contribute significantly to the energy relaxation processes of linear porphyrin arrays.

Conformational analysis, Zinc compounds

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Photoexcitations of covalently bridged zinc porphyrin oligomers: Frenkel versus Wannier-Mott type excitons

Article Abstract:

The effect of increasing chain length on the excited-state properties of two series of covalently linked zinc porphyrin oligomers is analyzed. Flash-photolysis time-resolved microwave conductivity measurements (FP-TRMC) depict that the excited single state (S1) of the 1,4-phenylene bridge (PB(sub n)) oligomers has a very small excess polarizability that is characteristic of a tightly bound, Frenkel type exciton.

Methods, Oligomers, Photolysis

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Extremely strong near-IR two-photon absorption in conjugated porphyrin dimers: Quantitative description with three-essential-states model

Article Abstract:

A study is carried out on the two-photon absorption spectra (2PA) of a series of conjugated dimers and the corresponding monomer in the near-IR region. The results show that the absolute values of the 2PA cross section in these molecules are quantitatively described by a quantum-mechanical expression, derived for the three-level model.

Analysis, Electric properties, Spectra, Infrared spectroscopy, Polarization (Electricity), Structure, Chromophores

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