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Porphyrin/calixarene self-assemblies in aqueous solution

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    0309616 - ÚFCH JH 2009 RIV CH eng J - Journal Article
    Kubát, Pavel - Lang, Kamil - Lhoták, P. - Janda, Pavel - Sýkora, Jan - Matějíček, P. - Hof, Martin - Procházka, K. - Zelinger, Zdeněk
    Porphyrin/calixarene self-assemblies in aqueous solution.
    [Samoorganizované porphyrin-kalix[4]arenové struktury ve vodných roztocích.]
    Journal of Photochemistry and Photobiology A-Chemistry. Roč. 198, č. 1 (2008), s. 18-25. ISSN 1010-6030. E-ISSN 1873-2666
    R&D Projects: GA ČR GA203/07/1424; GA ČR(CZ) GA203/06/1244; GA AV ČR KAN100500652; GA MŠMT(CZ) LC06063
    Institutional research plan: CEZ:AV0Z40400503; CEZ:AV0Z40320502
    Keywords : cationic porphyrin * calix[4]arene * thiacalix[4]arene
    Subject RIV: CF - Physical ; Theoretical Chemistry
    Impact factor: 2.362, year: 2008

    The variations of calix[4]arene linkages between phenolic units and of the cationic substituents on the porphyrin periphery affect modes of interaction and photophysical parameters of porphyrin/calixarene complexes. 5,10,15,20-Tetrakis(N-methylpyridinium-2-yl)porphyrin (TMPyP2) forms stable complexes with tetrasulfonated calix[4]arene, thiacalix[4]arene and sulfonylcalix[4]arene of the 1:1 stoichiometry with the binding constants above 106, (9.3 +- 0.9) x 105 and (8.3 +- 0.8) x 104 M-1, respectively. We suggest that quenching of the singlet and triplet states of TMPyP2 involves fast electron transfer between excited singlet and triplet porphyrin states and phenolates. Surprisingly, both 5,10,15,20-tetrakis(N-methylpyridinium-4-yl)porphyrin (TMPyP4) and 5,10,15,20-tetrakis(4-trimethylammoniophenyl)porphyrin (TMAPP) behave differently.

    Článek popisuje vliv substituce porfyrinu a kalix[4]arenu na tvorbu molekulárních komplexů a ostatních samorganizovaných struktur. Samorganizované struktury byly charakterizovány AFM, fluorescenční mikroskopií a metodami absorpční a fluorescenční spektroskopie.
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