Supramolecular host-guest flavylium-loaded zeolite L hybrid materials: network of reactions of encapsulated 7,4 '-dihydroxyflavylium

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Abstract

We report a spectroscopic study of the network of reactions of a flavylium dye encapsulated in the one-dimensional channels of zeolite L. The positively charged 7,4'-dihydroxyflavylium (AH(+)) is easily incorporated and remains stable in zeolite L channels. Once encapsulated, the flavylium exhibits a red shift in the excitation spectrum comparative to aqueous solutions. Moreover, contrary to the observed behavior in water, no excited state proton transfer takes place in the loaded crystals, corroborating the encapsulation of AH(+). The trans-chalcone (Ct) form from the same flavylium network could also be encapsulated inside the zeolite L, using toluene with 20% triethylamine as solvent and K+ as counter ion of the negative framework of the zeolite. The encapsulation of Ct is confirmed by changes on the excitation spectrum and by a blue shift in the emission. The encapsulated Ct was shown to generate AH(+) when the Ct-loaded crystals were suspended in water, which proves that isomerization, tautomerization and dehydration reactions take place inside the zeolite L.
Original languageUnknown
Pages (from-to)991-995
JournalPhotochemical & Photobiological Sciences
Volume9
Issue number7
DOIs
Publication statusPublished - 1 Jan 2010

Keywords

    Cite this

    @article{5f8ef82525684df488891d90269da181,
    title = "Supramolecular host-guest flavylium-loaded zeolite L hybrid materials: network of reactions of encapsulated 7,4 '-dihydroxyflavylium",
    abstract = "We report a spectroscopic study of the network of reactions of a flavylium dye encapsulated in the one-dimensional channels of zeolite L. The positively charged 7,4'-dihydroxyflavylium (AH(+)) is easily incorporated and remains stable in zeolite L channels. Once encapsulated, the flavylium exhibits a red shift in the excitation spectrum comparative to aqueous solutions. Moreover, contrary to the observed behavior in water, no excited state proton transfer takes place in the loaded crystals, corroborating the encapsulation of AH(+). The trans-chalcone (Ct) form from the same flavylium network could also be encapsulated inside the zeolite L, using toluene with 20{\%} triethylamine as solvent and K+ as counter ion of the negative framework of the zeolite. The encapsulation of Ct is confirmed by changes on the excitation spectrum and by a blue shift in the emission. The encapsulated Ct was shown to generate AH(+) when the Ct-loaded crystals were suspended in water, which proves that isomerization, tautomerization and dehydration reactions take place inside the zeolite L.",
    keywords = "aqueous-solutions ctab micelles photochromism channels systems dye 4', 7-dihydroxyflavylium nanocontainers mimicking chloride",
    author = "Parola, {Ant{\'o}nio Jorge Dias} and {DQ Group Author} and Pina, {Fernando Jorge da Silva}",
    year = "2010",
    month = "1",
    day = "1",
    doi = "10.1039/c0pp00022a",
    language = "Unknown",
    volume = "9",
    pages = "991--995",
    journal = "Photochemical & Photobiological Sciences",
    issn = "1474-905X",
    publisher = "Royal Society of Chemistry",
    number = "7",

    }

    TY - JOUR

    T1 - Supramolecular host-guest flavylium-loaded zeolite L hybrid materials: network of reactions of encapsulated 7,4 '-dihydroxyflavylium

    AU - Parola, António Jorge Dias

    AU - DQ Group Author

    AU - Pina, Fernando Jorge da Silva

    PY - 2010/1/1

    Y1 - 2010/1/1

    N2 - We report a spectroscopic study of the network of reactions of a flavylium dye encapsulated in the one-dimensional channels of zeolite L. The positively charged 7,4'-dihydroxyflavylium (AH(+)) is easily incorporated and remains stable in zeolite L channels. Once encapsulated, the flavylium exhibits a red shift in the excitation spectrum comparative to aqueous solutions. Moreover, contrary to the observed behavior in water, no excited state proton transfer takes place in the loaded crystals, corroborating the encapsulation of AH(+). The trans-chalcone (Ct) form from the same flavylium network could also be encapsulated inside the zeolite L, using toluene with 20% triethylamine as solvent and K+ as counter ion of the negative framework of the zeolite. The encapsulation of Ct is confirmed by changes on the excitation spectrum and by a blue shift in the emission. The encapsulated Ct was shown to generate AH(+) when the Ct-loaded crystals were suspended in water, which proves that isomerization, tautomerization and dehydration reactions take place inside the zeolite L.

    AB - We report a spectroscopic study of the network of reactions of a flavylium dye encapsulated in the one-dimensional channels of zeolite L. The positively charged 7,4'-dihydroxyflavylium (AH(+)) is easily incorporated and remains stable in zeolite L channels. Once encapsulated, the flavylium exhibits a red shift in the excitation spectrum comparative to aqueous solutions. Moreover, contrary to the observed behavior in water, no excited state proton transfer takes place in the loaded crystals, corroborating the encapsulation of AH(+). The trans-chalcone (Ct) form from the same flavylium network could also be encapsulated inside the zeolite L, using toluene with 20% triethylamine as solvent and K+ as counter ion of the negative framework of the zeolite. The encapsulation of Ct is confirmed by changes on the excitation spectrum and by a blue shift in the emission. The encapsulated Ct was shown to generate AH(+) when the Ct-loaded crystals were suspended in water, which proves that isomerization, tautomerization and dehydration reactions take place inside the zeolite L.

    KW - aqueous-solutions ctab micelles photochromism channels systems dye 4'

    KW - 7-dihydroxyflavylium nanocontainers mimicking chloride

    U2 - 10.1039/c0pp00022a

    DO - 10.1039/c0pp00022a

    M3 - Article

    VL - 9

    SP - 991

    EP - 995

    JO - Photochemical & Photobiological Sciences

    JF - Photochemical & Photobiological Sciences

    SN - 1474-905X

    IS - 7

    ER -