3－羟基－2－丁酮、二丙酮醇在几种溶剂中的红外光谱研究

Infrared Spectroscopic Studies of Acetoin and Diacetone Alcohol in Several Solvents

本文测定了３－羟基－２．丁酮（ａｃｅｔｏｉｎ）、二丙酮醇（ＤＡ）在四氯化碳、正庚烷、苯和１，２－二氯乙烷等中的红外光谱（３８００—３１００ｃｍ￣（－１））．根据谱峰的强度和峰位的变化，证实了ａｃｅｔｏｉｎ在溶液中能形成较稳定的五元环分子内缔合体，二丙酮醇可形成六元环分子内缔合体．另外，对甲醇、正了醇与ａｃｅｔｏｉｎ在四氯化碳中相互作用的红外光谱也进行了研究，结果表明，ａｃｅｔｏｉｎ分子中羰基和羟基的相互作用，使得自由基的吸收峰移向低频（△γ＝２０ｃｍ￣（－１）），同时羰基醇中羰基接受质子的能力亦被增强．

In the paper, the study of infra-red spectrums of acetoin and diacetone alcohol in CCl4, n-C7H16, C6H6 and 1, 2-C2H4Cl2 etc are described, It is confirmed that acetoin can form fairly steady five membered ring intrachain associated body, diacetone alcohol can form six membered ring intrachain associated' body, though the proportion of intrachain associated bodies may change somewhat, moreover, the infra- red spectrum of CH3OH, n-C4H9OH and acetoin that interact in CCl4 are also researched. The results show that interaction of carbonyl and hydroxyl cause the absorption peak of free hydroxyl shifted to lower frequency. Meanwhile, the ability of carbony in carbonyl alcohol that accepts proton is enhanced also.