Improvement of quantum yields for photoinduced energy/electron transfer by isolation of self-aggregative zinc tetraphenyl porphyrin-pendant polymer using cyclodextrin inclusion in aqueous solution

Article Abstract:

A new strategy is introduced for controlling lifetimes of photoexcited states of the self-aggregative sensitizer to improve the quantum yield for photoinduced electron/energy transfer. The experiment conducted with homogenously mixed solution containing poly-ZnP, quantum yields for photoinduced energy and electron transfer from photoexcited porphyrin units in the presence or absence of 2,3,6-tri-O-methyl-beta-cyclodextrin (TMBCD) is also investigated in steady state and time resolved spectroscopic measurements.

Science & research, Analysis, Chemistry, Physical and theoretical, Physical chemistry, Energy transfer, Cyclodextrins, Chemical properties

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Electron-transfer reactions between fullerenes (C60 and C70) and tetrakis(dimethylamino)ethylene in the ground and excited states

Article Abstract:

Steady-state spectroscopic methods were used to investigate the thermal equilibrium of radical ion in electron-transfer reactions between tetrakis(dimethylamino)ethylene and fullerenes (C60 and C70) in the ground and excited states. Results indicated that the radical ions take different solvated forms that depend on the solvent polarity. The combination of the equilibrium data with the kinetic data revealed that the electron transfer rate constants in the excited state are larger than those in the ground state.

Organic compounds, Oxidation-reduction reaction, Oxidation-reduction reactions, Carbon allotropes, Ethylene, Ethylene compounds

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Control of photoinduced energy- and electron-transfer steps in zinc porpyhyrin-oligothiophene-fullerene linked triads with solvent polarity

Article Abstract:

The dramatic changes of the lifetimes of the charge-separated (CS) states are confirmed in zinc porphyrin (ZnP)-oligothiophene (nT)-fulleren (C60) linked triads with the solvent polarity. It is found that the relation between the energy levels of two CS states, which strongly depend on the solvent polarity, causes dramatic changes of the lifetimes of the CS states in ZnP-nT-C60.

Japan, Industrial Organic Chemicals, Cyclic Crude and Intermediate Manufacturing, Porphyrins, Observations, Spectra, Optical properties, Electron transport

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