Charge transfer in porphyrin–calixarene complexes: ultrafast kinetics, cyclic voltammetry, and DFT calculations

Literature Information

Publication Date 2011-03-11
DOI 10.1039/C0CP01726D
Impact Factor 3.676
Authors

Pavel Kubát, Jakub Šebera, Stanislav Záliš, Jan Langmaier, Marcel Fuciman, Tomáš Polívka, Kamil Lang


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Abstract

Transient absorption spectroscopy, cyclic voltammetry, and DFT calculations were used to describe charge transfer processes in a series of 5,10,15,20-tetrakis(N-methylpyridinium-n-yl) porphyrins (TMPyPn, n = 4,3,2) and TMPyPn/p-sulfonatocalix[m]arene (clxm, m = 4,6,8) complexes. Excitation of TMPyPn is accompanied by an increasing electron density at the methylpyridinium substituents in the order TMPyP2 < TMPyP3 < TMPyP4. The quenching of the excited singlet states of the complexes increases with the number of ionized phenolic groups of clxm and can be correlated with the partial transfer of the electron density from O− to the peripheral methylpyridinium substituents rather than to the porphyrin ring.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
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