Abstract
| Original language | Unknown |
|---|---|
| Pages (from-to) | 991-995 |
| Journal | Photochemical & Photobiological Sciences |
| Volume | 9 |
| Issue number | 7 |
| DOIs | |
| Publication status | Published - 1 Jan 2010 |
Keywords
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Supramolecular host-guest flavylium-loaded zeolite L hybrid materials: network of reactions of encapsulated 7,4 '-dihydroxyflavylium. / Parola, António Jorge Dias; DQ Group Author ; Pina, Fernando Jorge da Silva.
In: Photochemical & Photobiological Sciences, Vol. 9, No. 7, 01.01.2010, p. 991-995.Research output: Contribution to journal › Article
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 -