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Liu L.,Hunan Province College Key Laboratory of QSAR QSPR | Liu X.,Hunan Province College Key Laboratory of QSAR QSPR | Li Y.,Hunan Province College Key Laboratory of QSAR QSPR | Yang G.,Hunan Province College Key Laboratory of QSAR QSPR | And 2 more authors.
Chinese Journal of Environmental Engineering | Year: 2015

A novel amphoteric chelating polymer flocculant poly(diallyl methyl hydroxypropoxy ammounium chloride)-based dithiocarbamate sodium (PDAMHACDTC) was synthesized and its structure was characterized by elemental analysis, FT-IR, ultravoilet spectroscopy and 1H-NMR spectroscopy. The removal efficiency of Cu2+ by PDAMHACDTC and the sedimentation rate of flocs formed were investigated; the zeta potential changes of microflocs were determined, and the images of flocs were investigated by using scanning electron microscope. The results show that when the molar ratio of -CSS- to Cu2+ is near 2∶1, the removal rate of Cu2+ is above 99.7%, and the concentration of residual Cu2+ is far below 0.5 mg/L of the first grade criteria of China's Integrated Wastewater Discharge Standard.When the dosage of -CSS- is the same, the zeta potential changes of microflocs and the sedimentation rate of flocs formed are higher than those formed by amphoteric chelating polymer flocculant (ACPF) based on poly(dimethyldiallylamonium chloride-acrylamide), respectively, indicating that PDAMHACDTC is more conducive to neuturizing the excess negative charge of flocs, thereby facilitating the formation and growth of flocs. ©, 2015, Science Press. All right reserved. Source


Li X.,Hunan Province College Key Laboratory of QSAR QSPR | Yi R.,Hunan Province College Key Laboratory of QSAR QSPR | Liu B.,Hunan Province College Key Laboratory of QSAR QSPR | Li Z.,Hunan Province College Key Laboratory of QSAR QSPR | And 2 more authors.
Chinese Journal of Organic Chemistry | Year: 2012

The 1,3-dipolar cycloaddition of azomethine ylide generated in situ from acenaphthenequinone (isatin) and sarcosine to 7-arylmethylidene-6,7- dihydroindolizin-8(5H)-ones afforded novel 4′-aryl-1′-methyl- 5′,6″-dihydro-2H,8″H-dispiro[acenaphthylene-1, 2′-pyrrolidine-3′,7″-indolizine]-2,8″-diones and 4′-aryl-1′-methyl-5″,6″-dihydro-8″H- dispiro[indole-3,2′-pyrrolidine-3′,7″-indolizine]-2, 8″(1H)-diones in moderate yields. The structures of the products were characterized thoroughly by NMR, IR, MS, elemental analysis together with X-ray crystallographic analysis. Source


Xiang J.,Hunan Province College Key Laboratory of QSAR QSPR | Yi P.,Hunan Province College Key Laboratory of QSAR QSPR | Yu X.,Hunan Province College Key Laboratory of QSAR QSPR | Chen J.,Hunan Province College Key Laboratory of QSAR QSPR | And 2 more authors.
Gaodeng Xuexiao Huaxue Xuebao/Chemical Journal of Chinese Universities | Year: 2015

Proton transfer as one of the basic reaction exists in a large variety of chemical and biochemical process. And the organic molecules that exist the proton transfer process offten existence potential applications in biological and chemical industry. In this work, the supramolecular interaction of 2-(2-hydroxyphenyl)benzothiazole(HBT) with different concentrations cucurbit[7]uril(CB7) and its influences on the exited state intramolecular proton transfer(ESIPT) of HBT were studied with stead-state and transient fluorescence spectra in the different solvents. Furthermore, the inclusion ratio of CB7 and HBT were obtained according to Benesi-Hildebrand equation based on the fluorescence data. The results show that the stoichiometric ratio 1:1 host-guest complex of CB7 with HBT is formed in the N,N-dimethyeformamide(DMF) or dichloromethane solution, and the proton transfer of HBT is very sensitive to solvent. When the concentration of CB7 was increased, the fluorescence lifetime and quantum yield of HBT were decreased and increased respectively. The phenolic oxygen negative ion was formed in DMF, and the ESIPT of HBT was decreased in dichloromethane. The quantum chemical calculations show that CB7 can form the 1:1 HBT@CB7 complexes for the enol or keto tautomer of HBT. ©, 2015, Higher Education Press. All right reserved. Source

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