Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 2016-01-15

Design, synthesis and ¹H NMR study of C3v-symmetric anion receptors with urethane-NH as recognition group.

Jin-Oh Park, Suban K Sahoo, Heung-Jin Choi

Index: Spectrochim. Acta. A. Mol. Biomol. Spectrosc. 153 , 199-205, (2015)

Full Text: HTML

Abstract

C3v-Symmetric anion receptors 3 and 4 with urethane groups were synthesized by using trindane triol as tripodal molecular framework. In (1)H NMR titration study, the receptors showed noticeable downfield shift/disappearance of the urethane-NH peak in presence of H2PO4(-) and F(-) due to the host-guest complexation occurred through multiple hydrogen bonding and/or the deprotonation of urethane-NH groups. Other tested anions such as Cl(-), Br(-), HSO4(-), and NO3(-) showed either no or negligible chemical shift of the urethane groups. The deprotonation event in 4 allowed selective detection of F(-) by perceptible color change from colorless to yellowish-red with the appearance of a new charge transfer absorption band at 450 nm.Copyright © 2015. Published by Elsevier B.V.