氢键对X-H配合物ν(CH)和ν(OH)振动的影响

J.P. Gallas, C. Binet
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引用次数: 4

摘要

当四氯化碳溶液中质子供体XH与异丙醇(D6)形成配合物X-H…O(H)CH(CD3)2时,我们观察到异丙醇(D6)的ν(CH)波数增加了约15 ~ 45cm−1,这取决于XH的质子供体能力;我们还观察到ν(OH)波数减少了约13至21 cm−1。ν(OH)的非调和性不变。[在(CF3)3COH…O(H)CD2CD2H配合物中],当CH与羟基距离较远时,ν(CH)的增量仅为3cm−1。异丙醇线性二聚体(D6)中游离羟基的ν(OH)波数比单体的观测值低5 cm−1。当质子供体为全氟叔丁醇时,ν(CH)带的强度一般在络合过程中减小,ν(OH)带的强度略有改变,或增大。
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Effets de la liaison hydrogene sur les vibrations ν(CH) et ν(OH) dans les complexes X-H…O(H)CH(CD3)2

When the complex X-H…O(H)CH(CD3)2 in a carbon tetrachloride solution is formed between a proton donor XH and isopropanol(D6), we observe for the ν(CH) wavenumber of isopropanol(D6) an increase of about 15 to 45 cm−1 which depends on the proton donor ability of XH ; we also observe a decrease for the ν(OH) wavenumber of about 13 to 21 cm−1. The ν(OH) anharmonicity is unchanged. When the CH group is at a greater distance from the hydroxyl group [in the (CF3)3COH…O(H)CD2CD2H complex] the increase for ν(CH) is only 3 cm−1. The ν(OH) wavenumber for the free hydroxyl group in the homomolecular linear dimer of isopropanol(D6) is 5 cm−1 lower than the observed value for the monomer. The intensity of the ν(CH) band generally decreases in the complexation, that of the ν(OH) band is slightly modified, or increases when the proton donor is perfluorotertiobutanol.

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