Uncooperative Effect of Hydrogen Bond on Water Dimer  

作　　者：Danhui Li Zhiyuan Zhang Wanrun Jiang Yu Zhu Yi Gao Zhigang Wang 李丹慧;张志远;姜万润;朱瑜;高嶷;王志刚(Institute of Atomic and Molecular Physics,Jilin University,Changchun 130012,China;Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201210,China;Institute of Theoretical Chemistry,Jilin University,Changchun 130012,China)

机构地区：[1]Institute of Atomic and Molecular Physics,Jilin University,Changchun 130012,China [2]Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201210,China [3]Institute of Theoretical Chemistry,Jilin University,Changchun 130012,China

出　　处：《Chinese Physics Letters》2021年第1期35-39,共5页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China(Grant Nos.11974136 and 11674123).

摘　　要：The water dimer demonstrates a completely different protype in water systems,it prefers not forming larger clusters instead existing in vapor phase stably,which contracts the viewpoint of the cooperative effect of hydrogen bond(O-H…O).It is well accepted that the cooperative effect is beneficial to forming more hydrogen bonds(O-H…O),leading to stronger H-bond(H…O) and increase in the O-H bond length with contraction of intermolecular distance.Herein,the high-precision ab initio methods of calculations applied on water dimer shows that the O-H bond length decreases and H-bond(H…O) becomes weaker with decreasing H-bond length and O…O distance,which can be considered as the uncooperative effect of hydrogen bond(O-H…O).It is ascribed to the exchange repulsion of electrons,which results in decrease of the O-H bond length and prevents the decrease in the O…O distance connected with the increasing scale of water clusters.Our findings highlight the uncooperative effect of hydrogen bond attributed to exchange repulsion of electrons as the mechanism for stabilizing water dimer in vapor phase,and open a new perspective for studies of hydrogen-bonded systems.

关 键 词：DIMER instead BONDS 

分 类 号：O641.3[理学—物理化学]