title: TDDFT study of twisted intramolecular charge transfer and intermolecular double proton transfer in the excited state of 4'-dimethylaminoflavonol in ethanol solvent.
abstract: Time-dependent density functional theory method at the def-TZVP/B3LYP level was employed to investigate the intramolecular and intermolecular hydrogen bonding dynamics in the first excited (S1) state of 4'-dimethylaminoflavonol (DMAF) monomer and in ethanol solution. In the DMAF monomer, we demonstrated that the intramolecular charge transfer (ICT) takes place in the S1 state. This excited state ICT process was followed by intramolecular proton transfer. Our calculated results are in good agreement with the mechanism proposed in experimental work. For the hydrogen-bonded DMAF-EtOH complex, it was demonstrated that the intermolecular hydrogen bonds can induce the formation of the twisted intramolecular charge transfer (TICT) state and the conformational twisting is along the C3-C4 bond. Moreover, the intermolecular hydrogen bonds can also facilitate the intermolecular double proton transfer in the TICT state. A stepwise intermolecular double proton transfer process was revealed. Therefore, the intermolecular hydrogen bonds can alter the mechanism of intramolecular charge transfer and proton transfer in the excited state for the DMAF molecule.
authors.affiliation: Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China.
authors.forename: Ye
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China. Electronic address: shi_ying@jlu.edu.cn.
authors.forename: Ying
authors.initials: Y
authors.lastname: Shi
authors.affiliation: Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China.
authors.forename: Lin
authors.initials: L
authors.lastname: Cong
authors.affiliation: Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China.
authors.forename: Hui
authors.initials: H
authors.lastname: Li
mesh_terms: D003198:Computer Simulation; D000431:Ethanol / Q000737:chemistry*; D047309:Flavones / Q000737:chemistry*; D044948:Flavonols / Q000737:chemistry*; D006860:Hydrogen Bonding; D008958:Models, Molecular; D008968:Molecular Conformation; D011522:Protons; D012997:Solvents / Q000737:chemistry; D013050:Spectrometry, Fluorescence
chemical_list: C000600914:4'-dimethylaminoflavonol; D047309:Flavones; D044948:Flavonols; D011522:Protons; D012997:Solvents; D000431:Ethanol
keywords: Excited state proton transfer; Hydrogen bond; Intramolecular charge transfer; Twisted intramolecular charge transfer