【摘要】 <正>分子间引力的选择性对物质的物理性质影响很大。选择性原因是由于分子中存在着集团与集团之间的加强（或削弱）作用。许多物性的反常现象都和集团之间的作用有关。例如在萜类的色谱分析中,单烯萜类在非极性固定相ApiezonL上的相对保留时间或作用力奇怪地超过极性固定相CN-（CH₂）₂-O-（CH）₂CN（用N表示）,而双烯萜类及参烯萜类的次序却是正常。色谱专家对此长期迷惑不解。这因为π键及大π键是电子云密集朝一定方向伸展的区域,是一个负电集团。单烯萜类π键负集团的朝向和凸环上的—CH₃正集团的更多还原

【Abstract】 The selectivity of intermolecular force is caused by the special interaction between two adaptable groups on the molecules。π bond and conjugated π bonds such as benzene ring are negative charged groups,which may attract stongly positively charged H groups such as 3H in β-C₆H₆Cl₆,and repulse other ne- gatively charged groups such as-. Our experiments show that the reduced retention time tr of benzene on non- polar β-C₆H₆Cl₆ is much greater than that on polar fixed phases such as CH₃-NO₂ in gas chromatography and that the heat of solvation of in benzene is also much greater than that of the polar α-C₆H₆Cl₆ and γ-C₆H₆Cl₆. This can’t be explained by the usual Van deWaals’ force It results from theselec- tive intermoleccular force. The more negative benzene ring and negative O^-δ of phenol may constitute a larger negative group —O^-,which may repulse strongly the other nega- tive groups of other molecule.According to the theory we have found interacts with polar phenol molecule surprisingly less than with ben- zene although phenol has larger molecular weight and stronger ability for hydrogen bond formation than benzene.更多还原