Thiourea–isothiouronium conjugate for strong and selective binding of very hydrophilic H2PO4− anion at the 1,2-dichloroethane–water interface
作者:Ryo Kato、Ying-Yu Cui、Seiichi Nishizawa、Tomoyuki Yokobori、Norio Teramae
DOI:10.1016/j.tetlet.2004.04.001
日期:2004.5
Potential use of a surfactant-like receptor is demonstrated at the 1,2-dichloroethane-water interface for strong and selective binding of H2PO4- over Br- and Cl-. The analysis by interfacial tensiometry reveals that the interfacial adsorption of a thiourea-isothiouronium conjugate, BT-C-1, is significantly stabilized by the binding of H2PO4- with the adsorption constant of 1.7 x 10(5) M-1 while the interfacial adsorptivity of this receptor is relatively moderate for Br- (0.81 x 10(5) M-1) and Cl- (0.63 x 10(5) M-1). Such complexation-induced interfacial adsorption behaviors of BT-C-1 are discussed as a basis for the development of receptor-based chemical sensors for phosphate anions. (C) 2004 Elsevier Ltd. All rights reserved.