Development of <i>N</i>-Benzamidothioureas as a New Generation of Thiourea-Based Receptors for Anion Recognition and Sensing
作者:Li Nie、Zhao Li、Jie Han、Xuan Zhang、Rui Yang、Wen-Xia Liu、Fang-Ying Wu、Jian-Wei Xie、Yu-Fen Zhao、Yun-Bao Jiang
DOI:10.1021/jo049088f
日期:2004.9.1
cm-1. Control experiments, effects of protic solvent, and 1H NMR titration confirmed the formation of hydrogen-bonding complexes between the new N-benzamidothiourea receptors and anions. The binding constants with AcO-, for example, are at 105−107 mol-1 L order of magnitude, which are 13 to 590 times those of the corresponding classic N-phenylthioureas in the same solvent. It was found that, whereas
一系列的中性ñ - (取代的苯甲酰氨基) - ñ ' -phenylthioureas(取代基= p -OC 2 ħ 5,p -CH 3,米-CH 3,H,p -Cl,p -Br,米-Cl,和p -NO 2)被设计为阴离子受体,其中硫脲结合位点通过N-N键与苯甲酰胺基连接。这些N-苯甲酰胺硫脲在乙腈中的吸收光谱在约60nm处达到峰值。270 nm被发现显示出空前的红移了7373至14325 cm - 1在阴离子如ACO的存在-,F - ,和H 2 PO 4 - 。在相同条件下,经典的中性硫脲受体N-(取代的苯基)-N'-苯基硫脲在大多数情况下均表现出小于800 cm - 1的吸收光谱位移,其中6501 cm - 1除外。对照实验,质子溶剂的作用和1 H NMR滴定证实了新的N-苯甲酰胺基硫脲受体和阴离子之间氢键络合物的形成。与ACO的结合常数- ,例如,处于10 5-10 7 mol - 1