Journal ArticleDOI
Site-selective photoinduced electron transfer from alcoholic solvents to the chromophore facilitated by hydrogen bonding : A new fluorescence quenching mechanism
TLDR
It is theoretically demonstrated for the first time that the selected hydrogen bonds are transiently strengthened in the excited states for facilitating the ultrafast solute-solvent intermolecular ET reaction.Abstract:
Solute−solvent intermolecular photoinduced electron transfer (ET) reaction was proposed to account for the drastic fluorescence quenching behaviors of oxazine 750 (OX750) chromophore in protic alcoholic solvents. According to our theoretical calculations for the hydrogen-bonded OX750−(alcohol)n complexes using the time-dependent density functional theory (TDDFT) method, we demonstrated that the ET reaction takes place from the alcoholic solvents to the chromophore and the intermolecular ET passing through the site-specific intermolecular hydrogen bonds exhibits an unambiguous site selectivity. In our motivated experiments of femtosecond time-resolved stimulated emission pumping fluorescence depletion spectroscopy (FS TR SEP FD), it could be noted that the ultrafast ET reaction takes place as fast as 200 fs. This ultrafast intermolecular photoinduced ET is much faster than the diffusive solvation process, and even significantly faster than the intramolecular vibrational redistribution (IVR) process of the ...read more
Citations
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Journal ArticleDOI
Hydrogen bonding in the electronic excited state.
Guangjiu Zhao,Ke-Li Han +1 more
TL;DR: The electronic excited-state hydrogen-bonding dynamics, which are predominantly determined by the vibrational motions of the hydrogen donor and acceptor groups, generally occur on ultrafast time scales of hundreds of femtoseconds as mentioned in this paper.
Journal Article
Hydrogen Bonding in the Electronic Excited State
Guangjiu Zhao,Ke-Li Han +1 more
TL;DR: The research expands the understanding of the nature of hydrogen bonding by delineating the interaction between hydrogen bonds and photons, thereby providing a basis for excited-state hydrogen bonding studies in photophysics, photochemistry, and photobiology.
Journal ArticleDOI
Advances in highly doped upconversion nanoparticles
TL;DR: A review of recent advances in developing highly doped UCNPs is surveyed, the strategies that bypass the concentration quenching effect are highlighted, and new optical properties as well as emerging applications enabled by these nanoparticles are discussed.
Journal ArticleDOI
Excited-state proton coupled charge transfer modulated by molecular structure and media polarization
TL;DR: With knowledge of the mechanisms of these processes, desired rates and directions can be achieved, and thus the multiple emission spectral features can be harnessed.
Journal ArticleDOI
Site-specific solvation of the photoexcited protochlorophyllide a in methanol: formation of the hydrogen-bonded intermediate state induced by hydrogen-bond strengthening.
Guangjiu Zhao,Ke-Li Han +1 more
TL;DR: It is theoretically confirmed that the intermolecular coordination and hydrogen bonds between Pchlide a and methanol molecules can be strengthened in the electronically excited state of PchLide a.
References
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Early Time Hydrogen-Bonding Dynamics of Photoexcited Coumarin 102 in Hydrogen-Donating Solvents: Theoretical Study
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