title: Study on the selectivity of anion receptors based on similar (thio)urea fragments.
abstract: Three new selective anion receptors containing the (thio)urea binding sites were developed, Indole-3-formaldehyde phenyl-semithiocarbazone, Indole-3-formaldehyde nitrophenyl-semithiocarbazone, and Indole-3-formaldehyde nitrophenyl-semicarbazone, nominated as receptors 1, 2 and 3, respectively. Receptor 1 shows high selective recognition for F(-) only, while both receptor 2 and receptor 3 containing a p-nitro group show high selective recognition for AcO(-). The high selective recognition of these receptors to anions is further investigated by X-ray crystallography diffraction, UV-vis, fluorescence analyses and (1)H NMR. Furthermore, receptor 2 changes from yellow to orange, and receptor 3 darkens when acetate is added, providing a way of detection by 'naked-eye'.
authors.affiliation: Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Chemistry College, Nankai University, Tianjin 300071, People's Republic of China.
authors.forename: Weiwei
authors.initials: W
authors.lastname: Huang
authors.forename: Zhongyue
authors.initials: Z
authors.lastname: Yang
authors.forename: Hai
authors.initials: H
authors.lastname: Lin
authors.forename: Huakuan
authors.initials: H
authors.lastname: Lin
mesh_terms: D000085:Acetates / Q000737:chemistry; D003116:Color; D005459:Fluorides / Q000737:chemistry; D007211:Indoles / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet; D013379:Substrate Specificity; D013890:Thiourea / Q000737:chemistry*
chemical_list: D000085:Acetates; D007211:Indoles; D013890:Thiourea; D005459:Fluorides