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Table of Content
20 November 1988, Volume 6 Issue 4
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THE PHOTOCATALYTIC DECOMPOSITION OF VARIOUS ORGANIC CARBOXYLIC ACIDS
CAI NAI-CAI, JIAN CUI-YING, DONG CHIN-HUA
1988, 6(4): 1-9. DOI:
10.7517/j.issn.1674-0475.1988.04.1
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The rate of photocatalytic decomposition of aqueous solutions of various organic car-boxylic acids with suspended Pt/TiO
2
powder was determinated and the inductive effect index of organic groups attached on the carboxylic group was calculated. It was found that the influence of the electron pulling ability of attached group on the decomposition of organic carboxylic acid is the dominating factor. A relation between the rate of photocatalytic decomposition and the molecular structure of the organic acid was observed.
PHOTOCHEMICAL STUDY OF DISSOCIATION-REDUCTION REACTION OF MANGANESE (Ⅲ) ACETYL-ACETONATE SENSITIZED
SHEN YU-QUAN, CAO YI, YU CHANG-JUN, LIU HUI-PING
1988, 6(4): 10-16. DOI:
10.7517/j.issn.1674-0475.1988.04.10
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The UV spectra of Mn(AA)
2
were studied in the presence of thionine under irradiation of 560 nm light. Mn(AA)
2
is reduced and through an intermediate, Mn(AA)
2
, Mn(Ac)
2
was obtained as a final product. Oxygen effects on the reaction were also investigated. The sensitized dissociation-reduction process of Mn(AA)
2
is identical with its direct photolysis reported in literature. The mechanism of the reaction is discussed and a new evidence of 1100 nm band as a charge transfer absorption band of Mn(AA)
2
is observed.
HYDROPHOBIC EFFECT ON PHOTOCHEMICAL AND PHOTOPHYSICAL PROCESSES Ⅶ. FLUORESCENCE SPECTRA AND AGGREGATION OF PYRENYL ALKYL KETONES IN POOR SOLVENTS
TUNG CHEN-HO, OUYANG XIN-XIN, LIU YONG-YONG
1988, 6(4): 17-23. DOI:
10.7517/j.issn.1674-0475.1988.04.17
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The monomer and excimer fluorescence spectra of pyrenyl alkyl ketones are sensitive to-environmental polarity. The monomer fluorescence in nonpolar solvents is very weak, but it becomes quite intense in polar solvents. Both monomer and excimer fluorescence maxima’ show significant red shift with increasing solvent polarity. This strong dependence of fluorescence on solvent polarity is used to study aggregation of long chain molecules in dimethyl sulfoxide-water mixture. At very low concentration pyrenyl alkyl ketones with long chain show excimer fluorescence and the monomer fluorescence is blue shifted, indicating aggregate formation Saturated hydrocarbons with long chain coaggregate with these ketones. The polarity in aggregates is analogous to that in cyclohexane.
THE EXCIPLEX FORMATION BETWEEN 2,6-DIMETHYL NAPHTHALENE DICARBOXYLATE AND SOME DIMETHYL NAPHTHALENES
BAI FENG-LIAN, WANG HAO, CHEN SHANG-XIAN
1988, 6(4): 24-29. DOI:
10.7517/j.issn.1674-0475.1988.04.24
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This paper is concerned with the exciplex formation between 2,6-dimethyl naphthalene di-carboxylate and some dimethyl naphthalenes. The relationship between the exciplex formation and molecular structure was studied by steady state and transient fluorescence measurements. Although the ionization potentials of dimethyl naphthalenes used was almost the same yet the charge distribution was different due to the different positions of two methyl groups on naphthalene. Thus, it was concluded that the capability of exciplex formation was affected not only by ionization potential but also by charge distribution.
SURFACE ENHANCED RAMAN SCATTERING OBSERVED ON THE INTERFACE OF PYRIDINE-KC1 AQUEOUS SOLUTION/n-CdS ELECTRODE
LI TIAN-KAI, CHEN JING-RONC
1988, 6(4): 30-35. DOI:
10.7517/j.issn.1674-0475.1988.04.30
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The surface enhanced Raman scattering (SERS) of pyridine adsorbed on a n-CdS electrode in an aqueous KC1 solution has been stud ied. When the CdS electrode was first subjected to anodization for ca. 5 min under illumination, the two strong peaks at 1010 and 1036 cm
-2
in the SERS spectrum of the adsorbed pyridine were observed. Compared with the characteristic peaks (at 991 and 1030 cm
-1
) in the Raman spectrum of pure pyridine they show obvious shifts. The surface Raman signal intensity was enhanced with increasing pyridine concentration. The effect of applied electrode potential on the SERS was also investigated. It shows that shape of its curve is similar to the
I-V
curve measured on the CdS electrode. The above results were briefly explained and discussed.
THE PHOTOCATALYTIC OXIDATION REACTION OF 1,4-BIPHENYLBUTADIENE ON CdS POWDER
Gu KE-JUN, CAO YI, ZHANG BAO-WEN
1988, 6(4): 36-42. DOI:
10.7517/j.issn.1674-0475.1988.04.36
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The photocatalytic oxidation reaction of 1,4-biphenylbutadiene on CdS powder in acetoni-trile was studied and it was found that water, TiO
2
, and sodium sulfite could promote the reaction. The possible mechanisms were discussed. Based on these investigations it is suggested that the methods to decrease the recombination of electron/hole pairs may increase the semiconductor photocatalytic yield.
1988, 6(4): 43-52. DOI:
10.7517/j.issn.1674-0475.1988.04.43
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THE STUDY OF ASSOCIATION INTERACTION BETWEEN TRISACETYLACETONATE MANGENESE (Ⅲ) AND THIONINE IN GROUND STATE
YU CHANG-JUN, SHEN YU-QUAN, CAO YI
1988, 6(4): 53-56. DOI:
10.7517/j.issn.1674-0475.1988.04.53
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When adding thionine to alcoholic solution of trisacetylacetonate manganese (Ⅲ), the UV spectrum is red shifted and a new peak around 340 nm is observed. Meanwhile a characteristic Stern-Volmer plot is obtained for the system in which static and dynamic quenching is active. Therefore experimental evidences are provided for the association interaction between the species in ground state.