Showing papers by "Tai-Bao Wei published in 2008"
TL;DR: In this article, the reaction of 1,1-diethyl-3-(4-fluorobenzoyl)-thiourea (HL) with CuCl2 and NiCl2 gave two complexes, Cu(HL)3Cl (1) and NiL2 (2).
Abstract: The reaction of 1,1-diethyl-3-(4-fluorobenzoyl)-thiourea (HL) with CuCl2 · 2H2O and NiCl2 · 6H2O give two complexes, Cu(HL)3Cl (1) and NiL2 (2). The crystal structures of these products were determined by single crystal X-ray diffraction. In 1, three HL molecules are unidentate, coordinating through the sulfur, and the copper is tetrahedral with three S and one Cl. In 2, two HL molecules are O and S donor bidentate and coordinate as anionic species with loss of the proton from the acyl-substituted nitrogen; the nickel is square-planar.
19 citations
TL;DR: Three title compounds have been designed and synthesized in high yields as novel anion receptors, which show a higher selectivity for F− than other halide ions and have better binding properties for anions than the molecular tweezer receptors based on thiourea.
Abstract: Three title compounds have been designed and synthesized in high yields as novel anion receptors, which show a higher selectivity for F− than other halide ions. The binding properties for fluoride ions of the receptors have been examined by UV-Vis and 1H NMR spectroscopy, indicating that a 1:1 stoichiometry complex is formed between the receptors and fluoride ions through hydrogen bonding interactions in DMSO solution. In addition, because these receptors have more binding points, they have better binding properties for anions than the molecular tweezer receptors based on thiourea we reported last time.
10 citations
TL;DR: Azo-salicylaldehyde Schiff base-typed receptors containing an acidic H-bond donor moiety were synthesized and characterized in this article, which indicated that these receptors could act as selective colorimetric sensors for basic anions and acidic species hydrogen sulfate by different color changes in a water-containing medium.
Abstract: Azo-salicylaldehyde Schiff base-typed receptors containing an acidic H-bond donor moiety were synthesized and characterized. The UV-Vis data indicate that these receptors could act as selective colorimetric sensors for basic anions and acidic species hydrogen sulfate by different color changes in a water-containing medium. The experiment of Bronsted acid-base reaction by adding the sodium hydroxide or perchloric acid revealed that the mechanism of recognition of anions might be deprotonation/protonation of the OH fragments by interacting with different anions and that the deprotonation/protonation process is fully reversible. The deprotonation/protonation of the receptors is responsible for the dramatic color change.
8 citations
TL;DR: Three title compounds were designed and synthesized in high yields as novel and simple anion receptors that had a higher selectivity for F− over AcO− and can be used as better recognition receptors for F − and CH3COO−.
Abstract: Three title compounds were designed and synthesized in high yields as novel and simple anion receptors. They had a higher selectivity for F− over AcO−. The binding properties for anions of the receptors were examined by UV-Vis and 1H NMR spectroscopy. The spectrographic data indicate that a 1:1 stoichiometry complex is formed between the receptors and the anions through hydrogen bonding interactions in DMSO solution. In addition, these molecular tweezers receptors have more binding points of anions, larger association constant, and better recognition ability. They can be used as better recognition receptors for F− and CH3COO−.
7 citations
TL;DR: A series of thiosemicarbazone derivatives of benzo-15-crown-5 were synthesized efficiently at room temperature using hydrogenchloride acid (HCl) as catalyst as discussed by the authors.
Abstract: A series of thiosemicarbazone derivatives of benzo-15-crown-5 were synthesized efficiently at room temperature using hydrogenchloride acid (HCl) as catalyst. Their anion recognition properties of a, b and c were studied, the result show they exhibit highly selective binding and sensing of F−, MeCO2 − and n-C3H7CO2 − in CH3CN (F− > n-C3H7CO2 − > MeCO2 − > > Cl−, Br− and I−). Especially receptor c shows different UV-Vis spectrum of F− from MeCO2 −and C3H7CO2 −, in addition to the color of the solution change from colorless to yellow upon the addition of F−, these two points make it suitable to be used as colorimetric anion sensor to identify fluoride anion from other halide anions and carboxylate anions by naked-eye. The connection between receptor and anion is by hydrogen bonding interactions, the binding ratio is 1:1, which have been confirmed by UV-vis inspection spectra in CH3CN and 1HMR in DMSO-d6.
5 citations
TL;DR: The N-(2-ethoxyphenyl)-N′-(4-ethoxybenzoyl)-thiourea has been synthesized under phase transfer catalysis at room temperature as mentioned in this paper.
Abstract: The N-(2-ethoxyphenyl)-N′-(4-ethoxybenzoyl)-thiourea has been synthesized under phase transfer catalysis at room temperature. The compound was characterized via IR, 1H NMR, 13C NMR, elemental analysis, and the structure of the compound was determined by X-ray diffraction analysis. Its crystal belongs to nonoclinic space group, with a = 2.0236(5) nm, b = 1.4543(4) nm, c = 1.4067(3) nm and α = 90.00°, β = 119.21(1)°, γ = 90.00° and Z = 8. The compound exhibits selective recognition for H2 PO4 −, AcO−, and F− in Me2SO. In addition, the compound is also a considerable plant-growth regulator.
4 citations