Two rationally designed 4-nitrophenyl-based molecular clefts functionalized with thiourea (L 1 ) and urea (L 2 ) have been synthesized and studied for a variety of anions by UV-Vis and colorimetric techniques in DMSO. Results from the binding studies suggest that both L 1 and L 2 bind halides showing the order: fluoride > chloride > bromide > iodide; and oxoanions showing the order: dihydrogen phosphate > hydrogen sulfate > nitrate > perchlorate. Each receptor has been shown to form a 1:1 complex with an anion via hydrogen bonding interactions, displaying distinct color change for fluoride and dihydrogen phosphate in solution. As compared to the urea-based receptor L 2 , the thiourea-based receptor L 1 exhibits stronger affinity for anions due the presence of more acidic thiourea functional groups.
Two rationally designed 4-nitrophenyl-based moleculn class="Chemical">ar clefts functionalized with thiourea (L 1 ) and urea (L 2 ) have been synthesized and studied for a variety of anions by UV-Vis and colorimetric techniques in DMSO. Results from the binding studies suggest that both L 1 and L 2 bind halides showing the order: fluoride > chloride > bromide > iodide; and oxoanions showing the order: dihydrogen phosphate > hydrogen sulfate > nitrate > perchlorate. Each receptor has been shown to form a 1:1 complex with an anion via hydrogen bonding interactions, displaying distinct color change for fluoride and dihydrogen phosphate in solution. As compared to the urea-based receptor L 2 , the thiourea-based receptor L 1 exhibits stronger affinity for anions due the presence of more acidic thiourea functional groups.
Authors: Martina Olivari; Riccardo Montis; Louise E Karagiannidis; Peter N Horton; Lucy K Mapp; Simon J Coles; Mark E Light; Philip A Gale; Claudia Caltagirone Journal: Dalton Trans Date: 2015-02-07 Impact factor: 4.390
Authors: Maryam Emami Khansari; Mohammad H Hasan; Corey R Johnson; Nya A Williams; Bryan M Wong; Douglas R Powell; Ritesh Tandon; Md Alamgir Hossain Journal: ACS Omega Date: 2017-12-18