1, 4, 8, 11-Tetrakis(4-ferrocenyl-3-azabutyl)-1, 4, 8, 11-tetraazacyclo-tetradecane as a ferrocene-functionalised polyammonium receptor for electrochemical anion sensing

摘要

The interaction of the ferrocene-functionalised polyaza receptor 1, 4, 8, 11-tetrakis (4-ferrocenyl-3-azabutyl)-1, 4, 8, 11-tetraazacyclotetradecane (L~1) with sulfate, phosphate and ATP has been studied potentiometrically in THF-water 70:30 v/v (0.1 mol dm~(-3) tetrabutylammonium perchlorate, 25 deg C). The molecular structure of the free receptor has been determined by single-crystal X-ray procedures. An electrochemical study on L~1 as a function of the pH has been carried out in THF-water 70:30 v/v in the presence of the sulfate, phosphate and ATP anions. The potential use of L~1 as an anion sensing receptor is discussed in terms of the electrochemical and potentiometric data and its behaviour is compared with those of related redox-active polyammonium receptors.