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CONCENTRATION EFFECT OF SENSITIZING DYE ON SPECTRAL SENSITIZATION OF SILVER HAliDE

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Science in China,Ser.B 1984年第2期27卷 125-136页

作者：李宝芳李津如江龙 institute of photographic chemistry academia sinica beijing

The effect of concentration of four dyes has been investigated, which are of similar mo-lecular structures, same spectroscopic absorption spectra, and very close values in redox po-tential upon the spectral sensitization of photographic emulsion. The results have shownthat dyes which are liable to form J-aggregate diminish the effect of dye-induced desensiti-zation, while dyes which are not easy to form J-aggregate exhibit a very strong effect ofdye-induced desensitization. According to phosphorescence and electrochemistry experimentalresults, we could assume that the aggregate state acts in a way to regenerate the oxidizeddye, thus being favorable to the spectral sensitization. In this paper, the factor of inhibi-tion of development by dye adsorption has also been proposed to be a factor which cannotbe neglected in dye-induced desensitization.

关键词： AgBr

PHOTOINDUCED CHARGE TRANSFER REACTION OF BENZOPHENONE WITH AMINE IN VESICLES

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Chinese Chemical Letters 1993年第7期4卷 587-590页

作者： Wei Dong YANG Miao Zhen li Er Jian WANG institute of photographic chemistry, academia, sinica, beijing 100101

Photoinduced charge transfer reaction of benzophenone(BP) with, mine was carried out in the vesicles of dicetyldimethylammonium bromide (DCDAB) over wide ranges of amine concentration (0. 01～4. 0M). linear plots of φ^(-1) vs. [TEA]^(-1) at low concentration of amine (<0.02M) and Φ^(-1) vs. [TEA]^(-2) at high concentration were obtained. Kinetic data demonstrate that the electron transfer is promoted significantly by DCDAB vesicles and proton transfer becomes more efficient at high Rmlne concentrations, leading to a decrease of Kd/Kr and increase of Kh/Ke. The kinetic expressions of photoreaction of BP bound to DCDAB bilayer are developed.

关键词： BP TEA PHOTOINDUCED CHARGE TRANSFER REACTION OF BENZOPHENONE WITH AMINE IN VESICLES

THE FEED BACK INHIBITION EFFECT ON THEINFECTIOUS DEVELOPMENT CAUSED BY N'-ACYL-N-PHENYLHYDRAZINE

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Chinese Chemical Letters 1992年第1期3卷 5-8页

作者： Ping CHEN Ren De SUN De Shui ZHENG institute of photographic chemistry,academia sinica,beijing 100101

The phenyl and methyl phenyl free radicals,formed in the oxidation-hydrolysis process of N’-acyl-N-phenylhydrazine, have been studied by ESR *** was found that the free radical is the chief cause which produces the f... 详细信息

关键词： ESR ACYL-N-PHENYLHYDRAZINE THE FEED BACK INHIBITION EFFECT ON THEINFECTIOUS DEVELOPMENT CAUSED BY N

OPTICAL EFFECTS OF ANION ADSORPTION ON SILVER SOL

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Chinese Chemical Letters 1993年第7期4卷 623-624页

作者： ling ZANG Chun Yan liU Xin Min REN institute of photographic chemistry, academia sinica, beijing 100101

The optical effects of anion adsorption on silver sol have been studied, It was found that the anion adsorption can make the absorption peak of pure silver sol shifting to longer vevelenngth, which is attributed to th... 详细信息

关键词： OPTICAL EFFECTS OF ANION ADSORPTION ON SILVER SOL

A FACILE SYNTHESIS OF 1.2-BISPYRROLEETHYLENS

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Chinese Chemical Letters 1993年第7期4卷 567-568页

作者： Qing Qi CHEN Fang YAN jin Shi Ma Sheng jin Department of chemistry, Peking University, beijing 100871 institute of photographic chemistry, academia sinica, beijing 100101

1. 2-Bispyrroleethylenes can be easily syntnesized bv cc,-,pt}ng pyrrolealdehyde using TiCl_4/Zn as a catalyst. It was found that when the R group is COMe or CO_2 Et, the product is a mixture of trans and cis isomers,... 详细信息

关键词： NH THF SH A FACILE SYNTHESIS OF 1.2-BISPYRROLEETHYLENS CO

芘在改性硅胶上的光物理研究——以芘为探针研究改性硅胶的表面特性

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物理化学学报 1989年第3期5卷 285-292页

作者：樊美公中国科学院感光化学研究所

研究了芘在正十碳烷氧基和三甲基硅氧基改性硅腔表面上的荧光光谱和寿命。在这二种硅胶上,激基缔合物是由基态聚积体直接受光和受激发的单分子和基态的单分子所形成、在硅胶≡Si—O—C_(10)H_(21)-n上比在硅胶≡Si—O—SiMe_3上所形成... 详细信息

研究了芘在正十碳烷氧基和三甲基硅氧基改性硅腔表面上的荧光光谱和寿命。在这二种硅胶上,激基缔合物是由基态聚积体直接受光和受激发的单分子和基态的单分子所形成、在硅胶≡Si—O—C_(10)H_(21)-n上比在硅胶≡Si—O—SiMe_3上所形成的聚积体较少。化学改性与物理改性相结合可使芘在较大的浓度范围内主要以单分子分散。激基缔合物的形成主要是由动力学过程所控制。研究了温度对芘的荧光光谱和寿命的影响。激基缔合物形成过程的活化能约为7kcal mol^(-1)。讨论了环境对单分子荧光光谱结构的影响。

关键词：改性硅胶表面特性芘荧光光谱

ADDITION OF SODIUM BISULFITE TO BIliVERDIN

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Chinese Chemical Letters 1990年第2期1卷 171-172页

作者： jin Shi MA Fang YAN Chang Qi WANG jin Hua CHEN institute of photographic chemistry,academia sinica,beijing,100101,China

Summary:Sodium bisulfite could add to the central methine bridge of biliver- din in methanol,and give sodium bilirubin-10-sulfonate,however no bilirubin was formed.

关键词： BV ADDITION OF SODIUM BISULFITE TO BIliVERDIN PP NH

IS THE“DEGREE OF AGGREGATION”A FUNCTION OF THE AVERAGE AGGREGATE NUMBER,OR OF THE NUMBER OF AGGREGATES,OR BOTH?

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Chinese Chemical Letters 1992年第9期3卷 675-676页

作者： Xi Kui jiang jin Tao ZHANG Shanghai institute of Organic chemistry,academia sinica,345 ling-ling LU,Shanghai 200032 Zhen He TONG Laboratory of Photochemistry,institute of photographic chemistry,academia sinica,beijing 100101

Measurement of the average aggregate number of coaggregates(N_co)and evaluation Of the number of coaggregates([CoAg])in the region of increasing degree of aggregation shows that only N_co increases linearly with the c... 详细信息

关键词： Menger A FUNCTION OF THE AVERAGE AGGREGATE NUMBER,OR OF THE NUMBER OF AGGREGATES,OR BOTH DEGREE OF AGGREGATION IS THE Figure OC

A STUDY ON THE SPECTRUM CHARACTER AND PHOTOSTABIliZATION ABIliTY OF A NOVEL UV-ABSORBER-DIBENZOYL METHANE

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Chinese Journal of Polymer Science 1987年第1期5卷 7-11页

作者：吴世康戴光松刘鲁生 institute of photographic chemistry academia sinica beijing

The absorption and fluorescence spectra of dibenzoyl methane have been studied. From the absorption spectra it was found that there are two peaks locating at 252 nm and 340 nm, respectively, similar to that of o-hydroxy benzophenone which can form intra-molecular hydrogen bond. Besides, an uncommonly large Stoke’s shift of fluorescence can be observed in fluorescence spectra. The photostabilizing effects of dibenzoyl methane and UV-531 on the photodegradation of poly (cis-1, 4-butadiene) in solution have been investigated and compared. A possible mechanism was discussed.

关键词： β-diketones UV-absorber Photostabilizer Intra-molecular hydrogen bond