New Subsidiary Interaction Mode of Counteranions with the Periphery Cavity of Calix[4]pyrroles Binding with the Anion Subunits  

作　　者：Kai LIU Yong GUO Jian XU Shi Jun SHAO Sheng Xiang JIANG 

机构地区：[1]Key Laboratory for Natural Medicine of Gansu Province, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000 [2]Graduate School of the Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100039

出　　处：《Chinese Chemical Letters》2006年第3期387-390,共4页中国化学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.20372067).

摘　　要：The solution binding properties of calix[4]pyrroles with anion （as tetraalkylammonium salts） were investigated using UV-Vis spectroscopic techniques. The obvious red-shift of absorption maximum band of calix[4]pyrrole in EtOH in the presence of the tetramethylammonium （TMA^＋） salts or tetraethylammonium （TEA^＋） salts were observed, due to the charge-transfer interactions between the electron-rich pyrrole rings of calix[4]pyrroles and TMA^＋ or TEA^＋ cation subunit. The results indicated that calix[4]pyrrole receptors, which link the anionic species through multiple hydrogen bonding interactions, can use the periphery cavity for selectively binding cation subunits by cation-π charge-transfer interaction. The subsidiary interaction mode helps to further stabilize the calix[4]pyrrole-anion complex.The solution binding properties of calix[4]pyrroles with anion （as tetraalkylammonium salts） were investigated using UV-Vis spectroscopic techniques. The obvious red-shift of absorption maximum band of calix[4]pyrrole in EtOH in the presence of the tetramethylammonium （TMA^＋） salts or tetraethylammonium （TEA^＋） salts were observed, due to the charge-transfer interactions between the electron-rich pyrrole rings of calix[4]pyrroles and TMA^＋ or TEA^＋ cation subunit. The results indicated that calix[4]pyrrole receptors, which link the anionic species through multiple hydrogen bonding interactions, can use the periphery cavity for selectively binding cation subunits by cation-π charge-transfer interaction. The subsidiary interaction mode helps to further stabilize the calix[4]pyrrole-anion complex.

关 键 词：Anion recognition CALIX[4]PYRROLE charge-transfer interactions tetraalkylammonium salts. 

分 类 号：O626.13[理学—有机化学]