Anion binding studies of tris(2-aminoethyl)amine based amide receptors with nitro functionalized aryl substitutions: A positional isomeric effect
作者:I. Ravikumar、P.S. Lakshminarayanan、Pradyut Ghosh
DOI:10.1016/j.ica.2010.02.030
日期:2010.10
crystallographically. Anion binding with multiple receptor units is observed via amide N–H···anion as well as aryl C–H···anion hydrogen-bonding interactions in all the complexes as observed in cases of previously reported crystal structures of anionic complexes of protonated L3. The aryl group having nitro functionality that contributes to solution state anion binding with the neutral receptor and solid state
摘要tr基酰胺L1,N,N',N''-tris [(2-氨基乙基)-4-硝基苯甲酰胺]和L2,N,N',N''-tris [的合成与晶体结构(2-氨基-乙基)-2-硝基-苯甲酰胺]的报告,并与以前发布的三脚酰胺受体L3,N,N',N''-三([(2-氨基-乙基)-3-硝基-苯甲酰胺]进行比较。晶体学结果表明,在L1和L2情况下,三脚架受体的两个臂与另外两个相邻分子之间的分子内和分子间氢键相互作用,而除上述相互作用外,三脚架臂之间还观察到芳族π··π堆积在L3中。研究了具有吸电子-NO2取代(分别为对,邻和间和间)苯基部分的受体L1,L2和L3,以了解它们的溶液态阴离子结合特性和选择性。在L1和L3的情况下,观察到酰胺质子(–NH)和芳族质子(–CH)在F−和Cl−的情况下化学位移发生了实质性变化,而对于L2仅在F−情况下观察到,表明–NH的参与溶液中的–CH质子表示结合事件。上述情况下的结合常数是通过在监测–NH信号时通过1