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

0358798 - ÚFCH JH 2012 RIV GB eng J - Journal Article
Kubát, Pavel - Šebera, Jakub - Záliš, Stanislav - Langmaier, Jan - Fuciman, M. - Polívka, T. - Lang, Kamil
Charge transfer in porphyrin–calixarene complexes: ultrafast kinetics, cyclic voltammetry, and DFT calculations.
Physical Chemistry Chemical Physics. Roč. 13, č. 15 (2011), s. 6947-6954. ISSN 1463-9076. E-ISSN 1463-9084
R&D Projects: GA ČR GAP208/10/1678; GA ČR GA203/09/0691
Institutional research plan: CEZ:AV0Z40400503; CEZ:AV0Z40320502
Keywords : porphyrin-calixarene complexes * voltammetry * DFT calculations
Subject RIV: CF - Physical ; Theoretical Chemistry; CA - Inorganic Chemistry (UACH-T)
Impact factor: 3.573, year: 2011

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.
Permanent Link: http://hdl.handle.net/11104/0196732