Analytical Sciences
Original Papers
Thermodynamics of Complexation between Thiourea-based Receptor and Acetate in Water/Acetonitrile Mixture
Takaya SUZUKIYuuta SHIBUYATakaya SATOSeiichi NISHIZAWAItaru SATOAkira YAMAGUCHI
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Volume 32 (2016) Issue 7 Pages 741-744

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Abstract

A thiourea-based receptor has been extensively studied for selective anion recognition for reasons of its strong hydrogen bond donor ability. In the present study, the thermodynamics of complexation between a thiourea-based receptor and acetate was examined in a water/acetonitrile mixture. The receptor used in this study was N,N′-bis(p-nitrophenyl)thiourea (BNPTU). UV/vis spectroscopic titration and isothermal titration calorimetry (ITC) experiments clearly revealed endothermic and entropy-driven complexation of BNPTU with acetate in water/acetonitrile mixtures. Since the endothermic peaks found in water/acetonitrile mixtures were about three times greater than those in acetonitrile, it appears that preferential hydration of both receptor and acetate was responsible for the endothermic and entropy-driven complexation reaction. The thermodynamic properties found in this study have the potential to contribute to the design of a thiourea-based anion receptor.

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© 2016 by The Japan Society for Analytical Chemistry
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