Zobrazeno 1 - 10 of 24 pro vyhledávání: '"Hiu Kwong Leung"'
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Sensitized photooxygenation VI. Kinetic studies on the singlet oxygenation of 6-ethyl-3, 4-dihydro-2H-pyran-5-carboxylic acid ethyl ester and 6-isopropyl-3,4-dihydro-2H-pyran-5-carboxylic acid ethyl ester
Autor: Xiao-Guang Liang, Yuk-Yee Chan, Ze-En Huang, Hiu-Kwong Leung
Publikováno v: Chinese Journal of Chemistry. 9:506-511
Kinetic studies of the singlet oxygenation of the title compounds were performed according to Monroe's method. The reaction rate increases with temperature decreasing, leading to a negative activation enthalpy and a large negative activation entropy.
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::47a27335b7fb87a7a4e8b4a96b7bb535
https://doi.org/10.1002/cjoc.19910090605
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3
Sensitized photoredox reactions IX: Thermodynamic factors in the porphyrin-sensitized photoreduction of methyl viologen
Autor: Ming Hu, Guo-Zhang Wu, Hiu-Kwong Leung
Publikováno v: Journal of Photochemistry and Photobiology A: Chemistry. 62:141-150
The quantum yields of the production of methyl viologen cation radical (MV+) on photolysis of the sensitizer—EDTA—MV2+ ternary system in aqueous dimethylsulphoxide were determined, with the sensitizers being neutral, oil-soluble porphyrins. By us
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a9334b82647ab00b7753aecbaaada30f
https://doi.org/10.1016/1010-6030(91)85112-t
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4
Linear dependence of the intensity of the [M + H]+ ion peak in fast atom bombardment mass spectrometry on the basicity ofmeso-substituted octaethylporphyrins
Autor: Lin Van, Hiu-Kwong Leung, Guo-Zhang Wu, Xi-Yun Liang, Yi-Wei Fang
Publikováno v: Organic Mass Spectrometry. 26:267-270
A fast atom bombardment mass spectrometric study of the meso-substituent effect of octaethylporphyrins (OEPX, X=NH 2 , CH 3 , H, CHO, Cl, CN, NO 2 ) is reported. The intensity of the [M+H] + ion peaks was estimated quantitatively using an external st
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::31d004e8853d81418fd731b270a88f66
https://doi.org/10.1002/oms.1210260416
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6
Sensitized photooxygenation: IV. Synthesis and singlet oxygenation of ethyl 6-ethyl-3, 4-dihydro-2H-pyran-5-carboxylate and ethyl 6-isopropyl-3, 4-dihydro-2H-pyran-5-carboxylate
Autor: Liang Xiao‐Guang, Huang Ze‐En, Hiu-Kwong Leung, Chan Yuk‐Yee
Publikováno v: Chinese Journal of Chemistry. 8:182-190
Title compound 2b and 2c were synthesized via the condensation of 1, 3-dibromopropane with the appropriate β-keto ester under mildly basic condition. Photooxygenation of them under singlet oxygenation condition gives two kinds of product, namely, di
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::91c21abb4499b07bc08aa6cd62948645
https://doi.org/10.1002/cjoc.19900080215
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7
A cyclic voltammetric study of the -chlorination of zinc octaethylporphyrin via anodic oxidation
Autor: Guo-Zhang Wu, Hiu-Kwong Leung
Publikováno v: Tetrahedron. 46:3457-3462
A detailed study of the cyclic voltammetry of ZnOEP-Et4NCl system in different concentration of chloride ion and different scan rate reveals that complexation between chloride ion and ZnOEP and ZnOEP+ occur and the complexes are active species in ele
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d04839814c2913047077d50c62f045d6
https://doi.org/10.1016/s0040-4020(01)81515-5
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8
Photoinduced energy and electron transfer in pyrene–porphyrin, porphyrin–benzoquinone binary systems and the pyrene–porphyri–benzoquinone ternary system
Autor: Zhi-Ming Lin, Wu-Zhan Feng, Hiu-Kwong Leung
Publikováno v: J. Chem. Soc., Chem. Commun.. :209-211
Intramolecular energy transfer (from singlet excited pyrene to porphyrin) and electron transfer (from singlet excited porphyrin to benzoquinone and then from ground state pyrene to the porphyrin cation radical) are observed in a covalently bonded pyr
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b66e9bcbda6d3212ffb3fd45417ab541
https://doi.org/10.1039/c39910000209
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9
Photophysical properties of meso-substituted octaethylporphines and their zinc complexes
Autor: Wei-Xing Gan, Hiu-Kwong Leung, Guo-Zhang Wu
Publikováno v: Journal of the Chemical Society, Faraday Transactions. 87:2933
The absorption and emission spectral properties of a series of meso-substituted octaethylporphines and their zinc complexes have been investigated. Changes in electronic absorption spectra induced by the substituents can be explained by Gouterman's
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::37865a1375db521da3a398121209a12f
https://doi.org/10.1039/ft9918702933
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