Anion Recognition Employing ‐NH Linked Organic Moieties

Abstract

This review mainly focuses on the design of organic receptors employing amide linkage. Review also highlights the sensing mechanism of different anions detected by amide based organic receptors in different medium. All the data collected in this review is from last two decades.

Highly soluble bisurea derivatives for anion recognition

“…Recently, anion recognition has been applied in the fields of medicinal and environmental chemistry for the detection and removal of anionic species; 1–10 therefore, various anion receptors have been designed and prepared. For example, since the ingestion of excess fluoride anions in drinking water causes fluorosis and kidney disease, Gale 12,13 and Gunnlaugsson 14,15 designed fluoride selective receptors bearing thiourea and amide groups as colorimetric sensors.…”

Electrochemical assessment of a tripodal thiourea-based anion receptor at the liquid|liquid interface

“…A thiourea has two highly polar N–H groups, which form the basis of strong anion:thiourea complexation via hydrogen bonding interactions. 8…”

“…A thiourea has two highly polar N-H groups, which form the basis of strong anion:thiourea complexation via hydrogen bonding interactions. 8 Pascal and co-workers 9 reported the first synthetic anion receptor utilising amide NHÁÁÁanion interactions, which showed an affinity for fluoride in dimethyl sulfoxide DMSO-d 6 , as assessed by 1 H and 19 F NMR spectroscopic studies. Anion receptors based on urea/thiourea moieties were later investigated by Wilcox and co-workers.…”