白酒中氢键缔合作用的研究——乙醇-水缔合体中质子间的交换作用

本文报导用核磁共振(NMR)技术研究醇-水混合体系中发生缔合作用的质子间的交换作用过程。质子间的交换速度与醇-水混合的比例有关,在中性条件下,60%乙醇含量的水溶液,质子间交换速度最大。这种交换速度随着贮存期的延长而减缓,使得缔合体的平均寿命增长。质子间的交换速度对微量酸的存在非常敏感,酸可促使缔合平衡的更快建立,但要控制过量酸的存在对缔合体稳定性的影响。

MODEI STUDIES ON THE ASSOCIATION OF HYDROGEN BONDING IN LIQUOR——EXCHANGE PRROGESSES BETWEEN ASSOCIATING PROTONS IN THE ETHANOL-WATER MIXTURE SYSTEM

Exchange process between associating protons in the ethanol-water mixture system was described by NMR. A maximum appears in the dependence of exchange rate on the concentration of ethanol-water mixture system. The exchange rates, decreasing with prolongating storage period, indicate, that the more stable associated bodies have formed via hydrogen bonding between alcohol and water molecules. The exchange process is very sensitive to the presence of contaminating H+ ions. It is an important event to dvoid the presence of excess acids which may influence the stability of the associated body in ethanol-water mixture system.