title: Negligible Isotopic Effect on Dissociation of Hydrogen Bonds.
abstract: Isotopic effects on the formation and dissociation kinetics of hydrogen bonds are studied in real time with ultrafast chemical exchange spectroscopy. The dissociation time of hydrogen bond between phenol-OH and p-xylene (or mesitylene) is found to be identical to that between phenol-OD and p-xylene (or mesitylene) in the same solvents. The experimental results demonstrate that the isotope substitution (D for H) has negligible effects on the hydrogen bond kinetics. DFT calculations show that the isotope substitution does not significantly change the frequencies of vibrational modes that may be along the hydrogen bond formation and dissociation coordinate. The zero point energy differences of these modes between hydrogen bonds with OH and OD are too small to affect the activation energy of the hydrogen bond dissociation in a detectible way at room temperature.
authors.affiliation: School of Physics and Electronic Technology, Liaoning Normal University , Dalian 116029, China.|State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of the Chemical Physics, Chinese Academy of Sciences , Dalian 116023, Liaoning, China.
authors.forename: Chuanqi
authors.initials: C
authors.lastname: Ge
authors.affiliation: State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of the Chemical Physics, Chinese Academy of Sciences , Dalian 116023, Liaoning, China.|University of the Chinese Academy of Sciences , Beijing 100049, China.
authors.forename: Yuneng
authors.initials: Y
authors.lastname: Shen
authors.affiliation: State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of the Chemical Physics, Chinese Academy of Sciences , Dalian 116023, Liaoning, China.
authors.forename: Gang-Hua
authors.initials: GH
authors.lastname: Deng
authors.affiliation: State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of the Chemical Physics, Chinese Academy of Sciences , Dalian 116023, Liaoning, China.
authors.forename: Yuhuan
authors.initials: Y
authors.lastname: Tian
authors.affiliation: School of Physics and Electronic Technology, Liaoning Normal University , Dalian 116029, China.
authors.forename: Dongqi
authors.initials: D
authors.lastname: Yu
authors.affiliation: State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of the Chemical Physics, Chinese Academy of Sciences , Dalian 116023, Liaoning, China.
authors.forename: Xueming
authors.initials: X
authors.lastname: Yang
authors.affiliation: State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of the Chemical Physics, Chinese Academy of Sciences , Dalian 116023, Liaoning, China.
authors.forename: Kaijun
authors.initials: K
authors.lastname: Yuan
authors.affiliation: State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of the Chemical Physics, Chinese Academy of Sciences , Dalian 116023, Liaoning, China.|Department of Chemistry, Rice University , Houston, Texas 77005, United States.|College of Chemistry and Molecular Engineering, Beijing National Laboratory for Molecular Sciences, Peking University , Beijing 100871, China.
authors.forename: Junrong
authors.initials: J
authors.lastname: Zheng