Anion Binding of<i>N</i>-(<i>o</i>-Methoxybenzamido)thioureas: Contribution of the Intramolecular Hydrogen Bond in the<i>N</i>-Benzamide Moiety
作者:Qian-Qian Jiang、Burenkhangai Darhkijav、Hao Liu、Fang Wang、Zhao Li、Yun-Bao Jiang
DOI:10.1002/asia.200900519
日期:2010.3.1
hydrogen bond identified in 2 X/2 Y. Such an intramolecular hydrogen bond is suggested to be responsible for the enhanced anion binding affinity. In the presence of this intramolecular hydrogen bond, the anion binding constant of 2 X was found to be independent of substituent X at the N‐phenyl ring, as in the case of 1, whereas that of 2 Y showed an amplified dependence on substituent Y at the N′‐phenyl
ñ - (邻-甲氧基苯甲酰氨基)硫脲(2 X / 2 Y)被发现显示出增强的阴离子与结合常数结合亲和力超过10 7个 摩尔-1 为ACO大小L的订单-和阴离子的红移吸收结合复合体在乙腈(MeCN)相对于N-苯甲酰胺硫脲(1)的乙腈(N-苯甲酰胺部分不具有o- OMe),尽管有o - OMe的供电子特性。的阴离子的吸收2 X / 2 Y复合物显示出的相同的电荷转移性质,该阴离子的1化合物,但它对取代基X的依赖性有趣地受到2 X / 2 Y中鉴定的o -MeO·⋅·HNCO六元环分子内氢键的影响。提示这种分子内氢键负责增强的阴离子结合亲和力。在存在此分子内氢键的情况下,发现2 X的阴离子结合常数与在N-苯环上的取代基X无关,就像在1的情况下一样,而2 Y的阴离子结合常数则显示出对取代基Y的放大依赖性。在N'-苯环上,但程度低于1。据称在2 Za,2 Zd和2 Ze中存在类似的环状分子内氢键,