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19 results on '"Qin, Hua"'

3. Phenothiazine and semi-cyanine based colorimetric and fluorescent probes for detection of sulfites in solutions and in living cells

Author

Hong-Cheng Xia, Hong-Wei Chen, O. A. Hakeim, and Qin-Hua Song

Subjects
chemistry.chemical_classification, Detection limit, Aqueous solution, General Chemical Engineering, Iodide, General Chemistry, Photochemistry, Condensation reaction, Fluorescence, Aldehyde, chemistry.chemical_compound, chemistry, Phenothiazine, Cyanine
Abstract

Four hemicyanine probes for selectively detecting sulfites (HSO3−/SO32−) have been constructed by the condensation reaction of 7-substituted (CN, Br, H and OH) phenothiazine aldehyde with 1-ethyl-2,3,3-trimethylindolium iodide. All four probes show a fast and sensitive response to HSO3−/SO32− via a Michael addition, with a detection limit lower than 40 nM based on monitoring their UV/vis absorption changes. Although all four probes display an increase in fluorescence when responding to HSO3−/SO32−, the increment is larger for the probe with an electron-withdrawing group than the probe with an electron-donating group, except for Br. Thus, among four probes the 7-cyano probe (PI-CN) possesses the largest fluorescent response to HSO3−/SO32−, and the lowest detection limit (7.5 nM). More expediently and easily, a film and a test paper with PI-CN have been prepared to detect HSO3−/SO32− in a sample aqueous solution selectively. Finally, the detection of HSO3−/SO32− by PI-CN in biological environments has been demonstrated by cell imaging.

Published
2021

5. Tuning slow magnetic relaxation behaviour in a {Dy2}-based one-dimensional chain via crystal field perturbation

Author

Fu-Pei Liang, Qin-Hua Zhang, Huancheng Hu, Shui Yu, Yuning Liang, Zilu Chen, and Dongcheng Liu

Subjects
Crystallography, Denticity, Materials science, Effective energy, General Chemical Engineering, Coordination number, Perturbation (astronomy), Magnetic relaxation, Chelation, General Chemistry, Crystal structure, Ion
Abstract

Two novel {Dy2}-based one dimensional chain compounds {[Dy2(H3L)4(OAc)6]·2MeOH}n (1) and {[Dy2(H3L)4(OAc)4(NCS)2]·2MeOH}n (2) (H3L = 1,3-bis(2-hydroxynaphthalenemethyleneamino)-propan-2-ol) have been prepared under solvothermal conditions. Crystal structure analyses indicate that 1 and 2 feature similar 1D chain structures bearing dinuclear secondary building units. The difference between these two structures is that one chelated acetate ligand of Dy(III) ion in 1 is replaced by one monodentate coordinated NCS− ion in 2, leading to their different coordination numbers and geometry configurations to Dy(III) ion. Magnetic properties indicate that 1 and 2 display slow magnetic relaxation behavior with an effective energy barrier of 16.44(2) K in 1 and 8.02(2) K in 2, respectively, which is maybe attributed to the subtle crystal field perturbation of Dy(III) ions.

Published
2020

19. SO 2 F 2 mediated cascade dehydrogenative Morita-Baylis-Hillman reaction of the C(sp 3 )-H of primary alcohols with the C(sp 2 )-H of electron-deficient olefins for the assembly of allylic alcohols.

Author

Jiang Y, Alharbi NS, Sun B, and Qin HL

Abstract

A cascade dehydrogenative Morita-Baylis-Hillman reaction of the C(sp 3 )-H of primary alcohols with the C(sp 2 )-H of electron-deficient olefins for forming allylic alcohols mediated by SO 2 F 2 was developed. This method provides a mild process for the preparation of allylic alcohol moieties without the requirement of transition metals., Competing Interests: There are no conflicts to declare., (This journal is © The Royal Society of Chemistry.)

Published
2019
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