title: Intermolecular hydrogen bond and twisted intramolecular charge transfer in excited state of fast violet B (FVB) in methanol solution.
abstract: The excited state hydrogen bonding dynamics and corresponding photophysical processes of fast violet B (FVB) in hydrogen-donating methanol (MeOH) solution are investigated by using time-dependent density functional theory (TDDFT) method. In the FVB molecule, there are -C=O, -N-H groups which could act as hydrogen acceptor and donor. It is demonstrated that both the intramolecular hydrogen bond O⋯H-N in FVB and intermolecular hydrogen bond C=O⋯H-O between FVB and MeOH are formed in the ground state S0 and strengthened in the excited state S1. The absorption spectra are obviously red shifted for the hydrogen-bonded complex in comparison with FVB monomer in the low energy range. The theoretical investigation demonstrates that the twisted intramolecular charge transfer takes place in the excited states for both isolated FVB and hydrogen-bonded complex, and the dominant twisting is along N2-C3 bond. The potential energy curve is investigated to understand the photophysics process of FVB and hydrogen-bonded complex.
authors: School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, China; State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China. Electronic address: chaishuo@dlut.edu.cn.
authors: Shuo
authors: S
authors: Chai
authors: School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, China.
authors: Shu-Lin
authors: SL
authors: Cong
mesh_terms: D003198:Computer Simulation; D003979:Diazonium Compounds / Q000737:chemistry*; D004583:Electrons; D006860:Hydrogen Bonding; D000432:Methanol / Q000737:chemistry*; D008968:Molecular Conformation; D011789:Quantum Theory; D012996:Solutions; D013997:Time Factors
chemical_list: D003979:Diazonium Compounds; D012996:Solutions; C067037:Fast Violet B; D000432:Methanol
keywords: Excited state dynamics; Intermolecular hydrogen bond; Time-dependent density functional theory; Twisted intramolecular charge transfer