IMAGING SCIENCE AND PHOTOCHEMISTRY

Synthesis of Polystyrene-Supported Polypyridyl Platinum Acetylide Complex

PENG Ming-li, WU Li-zhu, ZHANG Li-ping, TONG Zhen-he

2004, 22(5): 321-326. DOI: 10.7517/j.issn.1674-0475.2004.05.321

Asbtract ( 968 )

PDF (1166KB) ( 1376 )

References | Related Articles | Metrics

6-phenyl-2,2’-bipyridyl platinum (Ⅱ) acetylide complex with high luminescent quantum yield was covalently bonded to polystyrene by radical copolymerization.It was noted that the lumeniscent polymer displayed the similar spectroscopic properties compared with those of 6-phenyl-2,2’-bipyridyl platinum (Ⅱ) acetylide complex.

Preliminary Study on Band Structure of TiO₂ Thin Photoelectrode and Catalytic Activity

KONG Hai-xia, SUN Yan-ping, WU Ai-lian

2004, 22(5): 327-332. DOI: 10.7517/j.issn.1674-0475.2004.05.327

Asbtract ( 1130 )

PDF (812KB) ( 2350 )

References | Related Articles | Metrics

A three-electrode system composed of TiO₂ photoelectrode as the working electrode,Pt ring as the counter electrode and saturated calomel electrode (SCE) as the reference electrode was used for the photoelectrocatalytic degradation of phenol.The TiO₂ thin film photoelectrode was made by anodizing.During the photoelectrocatalytic process,Electrochemical Impedance Spectroscopy (EIS) was applied to measure the capacitance of space charge layer in the TiO₂ semiconductor photoelectrode,and to calculate the band structure parameter-the width W of space charge layer.The results show that photocatalytic activity of TiO₂ electrode is improved when the width broadens with the bias increasing; the activity reaches best when the width is nearly equivalent to the thickness of TiO₂ thin film,then the optimal value of the bias appears; the activity somewhat decreases when the bias is beyond the optimal value.

Cooperative Sensitization of AgBr Core-Shell Emulsions by Internal Reduction and Surface Chemical Sensitization

SHI Yao, ZHI Xin, XIA Pei-jie, ZHAO Wen-fang

2004, 22(5): 333-342. DOI: 10.7517/j.issn.1674-0475.2004.05.333

Asbtract ( 1037 )

PDF (1064KB) ( 1362 )

References | Related Articles | Metrics

A series of cubic AgBr core-shell emulsions were prepared from the core emulsions reduced by DMAB and shelled by AgBr.These core-shell emulsions doped with Ag₂ in the interior of grains exhibited a significant increase in sensitivity.After these emulsions were sensitized respectively by sulfur,gold or sulfur-plus-gold,the relative sensitivities of the emulsions were much higher than that of the controlled ones without Ag₂ in the interior of grains,i.e.[DMAB]=0.The results showed that a cooperative sensitization of the AgBr core-shell emulsions by internal reduction and surface chemical sensitization.On the other hand,the fog densities of these chemically sensitized emulsions rose rapidly with the amount of DMAB added in preparation of core emulsions,particularly in the cases of sulfur-plus-gold or gold sensitization.It was considered to be related to Ag₂ on the surface of grains,which were expelled from the cores in shelling process.In addition,an increase in the shelling rate was more favorable to depress the fog.

Chemical Sensitization of the Silver Bromide Microcrystal Emulsion by PbS Nanoparticles

XU Chun-hua, LI Jin-pei

2004, 22(5): 343-349. DOI: 10.7517/j.issn.1674-0475.2004.05.343

Asbtract ( 976 )

PDF (278KB) ( 1533 )

References | Related Articles | Metrics

It was found that the silver bromide emulsion can be chemically sensitized by PbS nanoparticles.Contrast experiments of PbS and Na₂S₂O₃ sensitization were carried out,and the influence of the sensitizer dosage,the sensitization temperature and pAg,the shapes of silver bromide microcrystals,and the sensitization cooperated with HAuCl₄ were studied.

Cooperative Sensitization by Reduction and Chemical Sensitizations in AgBrⅠ Core-Shell Emulsions

ZHI Xin, SHI Yao, CAO Jing, XIA Pei-jie

2004, 22(5): 350-356. DOI: 10.7517/j.issn.1674-0475.2004.05.350

Asbtract ( 1085 )

PDF (855KB) ( 1272 )

References | Related Articles | Metrics

A series of cubic AgBrⅠ core-AgBr shell emulsions with different amounts of DMAB used for producing Ag₂ (R center) in the core were prepared by using a double-jet apparatus controlled by a microcomputer.The results from sensitometric measurements of these emulsions show that the emulsions doped by Ag₂ in the AgBrⅠ core exhibited a significant increase in sensitivities and the existence of I^- in the core-shell grains did not influence the sensitization of the internal Ag₂; and that these core-shell emulsions after surface sensitization by sulfur-plus-gold exhibited a remarkable cooperative sensitization,i.e.their sensitivities were much higher than that of the controlled one which was not doped with Ag₂ in the core.These results reconfirmed two kinds of different sensitization mechanisms,i.e.via trapping holes by the internal Ag₂ centers and concentration of electrons by sulfur-plus-gold sensitizing centers.Taking advantage to both mechanisms,a cooperative sensitization could be realized to improve the efficiency of latent image formation.

Study on Fluorescent Spectra of Several Common Materials Using in OLEDs

PENG Zhao-kuai, TAO Si-lu, ZHANG Xiao-hong, WU Shi-kang

2004, 22(5): 357-362. DOI: 10.7517/j.issn.1674-0475.2004.05.357

Asbtract ( 1072 )

PDF (247KB) ( 1596 )

References | Related Articles | Metrics

Fluorescence quenching and photoinduced electron transfer between several common materials,hole-transporting material,TPD,NPB and electron-transporting material,AlO₃ using in OLEDs were studied.Based on the measurement of fluorescence quenching constants of these compounds and the calculation of Gibbs’ free energy changing of these processes,it was concluded that the property of process studied in this work possesses character of electron transfer definitely.Compared their fluorescence quenching effect,ΔG,and T_g,NPB was thought to be a better hole transporting material than TPD.

Synthesis and ESR Investigation of a New Hypocrellin Glycoside

XIA Sheng-qin, CHEN Jing-rong, WANG Xue-song, ZHANG Bao-wen

2004, 22(5): 363-369. DOI: 10.7517/j.issn.1674-0475.2004.05.363

Asbtract ( 998 )

PDF (814KB) ( 1397 )

References | Related Articles | Metrics

A new glycose derivatized hypocrellin B was synthesized in a facile way.The water-solubility and the absorbance in the phototherapeutic window was enhanced in the resulting product over hypocrellin B.Electron spin resonance (ESR) measurements indicated that this glycoside remained the photodynamic capability of generating ¹O₂,O₂^·-,^·OH, and semiquinone anion radical.

New Cyclometalated Platinum(Ⅱ) Complexes: Synthesis,X-Ray Structure and Electronic Spectra

CAO Qian-yong, FU Wen-fu, JIA Lin-fang, YU Ming-ming

2004, 22(5): 370-377. DOI: 10.7517/j.issn.1674-0475.2004.05.370

Asbtract ( 1121 )

PDF (341KB) ( 1332 )

References | Related Articles | Metrics

A new cyclometalated ligand 4-methoxycarbonyl-6-(4-methylphenyl)-2,2’-bipyridine (HL) and its mono- and binuclear platinum (Ⅱ) complexes (ClO₄) (1) and (ClO₄)₂ (2) (dppm=bis (diphenylphosphino)methane) were synthesized and characterized.In complex 2,the platinum (Ⅱ) center adopts distorted square planar coordination geometry and two platinum (Ⅱ) centers are bridged through biphosphine ligand dppm,and metal-metal interaction exists with Pt-Pt distance 0.3375 nm.Both complexes have low-lying absorption spectra with shoulder peak at ～450 nm which are assigned to metal to ligand charge-transfer transition (MLCT).Both complexes display strong luminescence spectra in solution or solid state.For complex 1,the low energy emission spectra of 620 nm indicates an intermolecular π-π interaction between two ligands in solid state,and in solid or fluid state metal-metal to ligand-charge-transfer (MMLCT) triplet state emissions were observed for complex 2.

A Photoelectrochemical Study of the Poly(3-Methythiophene)

WU Wen-jun, HAO Yan-zhong

2004, 22(5): 378-382. DOI: 10.7517/j.issn.1674-0475.2004.05.378

Asbtract ( 1104 )

PDF (936KB) ( 1873 )

References | Related Articles | Metrics

The photoelectrochemical properties of the poly(3-methythiophene) film on the ITO were investigated with photoelectrochemical methods.The band gap of the poly(3-methythiophene) is 1.93 eV.The conduction band and valence band were determined to be -3.44 eV and -5.37 eV respectively.The maximal IPCE is 1.0%.

Studies on Photocatalytic Decoloration and Degradation Processes of Reactive Brilliant Red X-3B Aqueous Solution

LI Yu-hao, MAO Li-qun, ZHANG Shun-li, JIN Zhen-sheng, ZHANG Zhi-jun

2004, 22(5): 383-390. DOI: 10.7517/j.issn.1674-0475.2004.05.383

Asbtract ( 785 )

PDF (330KB) ( 1492 )

References | Related Articles | Metrics

The photocatalytic reaction of reactive brilliant red X-3B aqueous solution was studied.During the photocatalytic processes,ultraviolet-visible spectrophotometer,high performance liquid chromatograph and mass spectrograph were applied to investigate the composite changes of reactive brilliant red X-3B aqueous solution,and the COD values of reactive brilliant red X-3B aqueous solution were measured by dichromate titration method,the adsorptive species on the surface of catalysts were tested by Fourier transform infrared spectrometer.The results indicated that,the photocatalytic decoloration and degradatin processes were taken place simultaneously under our experimental conditions.Some species which difficult to mineralize were produced in the solution after decoloration process,so that,the mineralization process was difficult to proceed.

Synthesis of a Novel Functional Development Accelerator

LIU Yu-ting, LÜ Feng, ZOU Jing, ZHANG Da-de, YAO Zu-guang

2004, 22(5): 391-395. DOI: 10.7517/j.issn.1674-0475.2004.05.391

Asbtract ( 871 )

PDF (693KB) ( 1425 )

References | Related Articles | Metrics

A novel functional photographic developement accelerator was synthesized in this paper.It has a linking group which is 2-amino-5-mercapto-1,3,4-thiociazole and an accelerator group which is 4,4-dimethyl-1-phenyl-3-pyrazolidinone.The structure of the functional photographic development accelerator was identified by IR,~1H-NMR,MS,and elemental analysis.It can be used to accelerate development without unduly increasing fog because of it’s unique structure.It can be used directly or was synthesized with Cp-X to obtain DAR couplers to accelerate development.

2004, 22(5): 396-396. DOI: 10.7517/j.issn.1674-0475.2004.05.396

Asbtract ( 678 )

PDF (55KB) ( 1249 )

Table of Content