几种二醇与非质子溶剂相互作用的红外光谱研究

测定了1，2-乙二醇、1，2-丙二醇、1，4-丁二醇和1，6-己二醇在CCl4中分别与十几种非质子溶剂相互作用的红外光谱，通过考察频率位移的变化，定量地研究了二醇分子内氢键与分子间氢键的协同效应．在四氯化碳介质中，乙二醇、1，2-丙二醇和1，4-丁二醇体系中存在明显的氢键协同效应。利用红外光谱数据，估算了常温下二醇分子内缔体与非质子溶剂的交叉缔合常数，其数值大于一元正链醇与相应溶剂的交叉缔合常数．

Infrared Spectroscopic Studies of Interactions of the Diols with Aprotic Solvents

Infrared spectra of 1,2-ethanediol, 1,2-propanediol, 1,4- butanediol and 1,6-hexanediol in CCl_4 were determined in the presence of an aprotic solvent B. The cooperative effects of intraand intermolecular hydrogen bonds for the diols were quantitatively discussed by analyzing these IR spectra. The results indicated that the formation of intramolecular hydrogen bonds in diols had definitely strengthened the intermolecular hydrogen bonds of the naked OH groups with basic solvents, in addition, for 1,2-ethanediol and 1,2-Propanediol the formation constants of the diol intramolecular associates and those of intermolecular associates between diol intramolecular species and B were also estimated. Compared with the inter molecular formation constants of the correspondent monoalkanols with B, K_B of diols were much higher. The fact also showed that the intramolecular hydrogen bonds polarize the naked hydroxy group, strengthening the O-H…B hydrogen bonds.