Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 13, Issue 15, Pages 6947-6954Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0cp01726d
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Funding
- Czech Science Foundation [P208/10/1678, 203/09/0691]
- Academy of Sciences of the Czech Republic [AV0Z40320502, AV0Z40400503]
- Ministry of Education, Youth and Sports [MSM6007665808]
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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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