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- W2314892729 endingPage "24770" @default.
- W2314892729 startingPage "24763" @default.
- W2314892729 abstract "The excited-state proton transfer (ESPT) of 7-hydroxyquinoline (7HQ) embedded in hydrogels based on self-assembled peptide nanotubes (PNTs) has been investigated with variation of peptides as well as protic hydrogen isotopes. In the inner cavities of PNT-based hydrogels, 7HQ prefers to exist as an anionic species rather than a normal species or a cationic species already in the ground state because the hydrogels are mildly basic. Upon excitation, ESPT takes place from a water molecule in a PNT hydrogel nanocavity to the imino group of the anionic species to produce a zwitterionic species, and its back reaction, that is, geminate recombination between the proton of the iminium group of the zwitterionic species and the deprotonated water molecule, also occurs because of the extremely viscous environment as well as the spatial constraint of semirigid PNT hydrogels. As a result, an excited-state prototropic equilibrium between the anionic and the zwitterionic species is established in PNT hydrogels. Water nanopools confined in smaller PNTs are denser than those in larger PNTs, so that 7HQ molecules in the smaller PNTs have more chances to form strong hydrogen bonds with water molecules. Consequently, both ESPT and geminate-recombination in the smaller PNTs are faster than the respective ones in the larger PNTs." @default.
- W2314892729 created "2016-06-24" @default.
- W2314892729 creator A5007054443 @default.
- W2314892729 creator A5011768456 @default.
- W2314892729 creator A5026996907 @default.
- W2314892729 creator A5059296853 @default.
- W2314892729 creator A5082386449 @default.
- W2314892729 date "2011-11-22" @default.
- W2314892729 modified "2023-09-29" @default.
- W2314892729 title "Excited-State Proton Transfer and Geminate Recombination in Hydrogels Based on Self-Assembled Peptide Nanotubes" @default.
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- W2314892729 doi "https://doi.org/10.1021/jp207245q" @default.