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双接触弯曲蓝移氢键CH_2…Y的理论研究 被引量:1

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摘要 用量子化学从头算方法在MP2/6-311++G(d,p)与MP2/6-311++G(2df,2p)两个理论级别上研究了双接触弯曲氢键Y…H2CZ(Z=O,S,Se)和Y…H2CZ2(Z=F,Cl,Br)(Y=Cl-,Br-).计算表明,在这些复合物中都存在两个等价的Y…H—C蓝移氢键;相互作用能和蓝移都比较大,每个Y…H—C氢键的能量为15~27kJ/mol,CH键长变化为-0.1~-0.5pm,CH伸缩振动频率位移为30~80cm-1.自然键轨道分析表明,3个因素导致了这些蓝移氢键的形成:(1)存在较大的重杂化;(2)弯曲的氢键构型使得分子间直接超共轭相互作用比较小,而存在相当的分子间间接超共轭相互作用;(3)质子给体的分子内超共轭相互作用较大地减小.电子密度拓扑性质的研究表明,在这些氢键复合物中都存在3个分子间临界点:在接受体原子Y与每个H原子之间存在一个键临界点,也存在相应的键径和原子间界面;在YHCH四边形内部存在一个环临界点.因此这些分子间相互作用可以严格地看作氢键.
作者 黎安勇
出处 《中国科学(B辑)》 CSCD 北大核心 2008年第7期557-566,共10页 Science in China(Series B)
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