IMAGING SCIENCE AND PHOTOCHEMISTRY

The Synthesis and Photophysical Properties of 4-(4-Tolyl-6-Phenyl-2,2′-Bipyridyl) Platinum(Ⅱ) Aryl-Substituted Acetylide Complexes

HAN Xue, WU Li-zhu, WU Zi-xin, ZHANG Li-ping, TONG Zhen-he(TUNG Chen-ho)

2006, 24(3): 161-166. DOI: 10.7517/j.issn.1674-0475.2006.03.161

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4-(4-tolyl)-6-phenyl-2,2′-bipyridylplatinum (Ⅱ) aryl-substituted acetylide complexes 1-3 were designed and synthesized.In contrast to complexes 1 and 2,when 9-acetylide-anthracene is employed as ancillary ligand,the energy of lowest emissive excited state of complex 3 increases.

Synthesis and Spectra Properties of Soluble Perylene Bisimides with Carboxylic Groups

HONG Xin-jin, LUO Qian, WANG Chun-xiang, XUE Min-zhao, ZHANG Qing, SHENG Qiao-rong, LIU Yan-gang

2006, 24(3): 167-172. DOI: 10.7517/j.issn.1674-0475.2006.03.167

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Three soluble perylene bisimides with carboxylic groups: N,N’-bis (5-carboxy-pentyl)-1,6,7,12-tetraphenoxy-3,4,9,10-perylene bisimide (3a),N,N’-bis (5carboxy-pentyl)-1,6,7,12-tetra (methyl-phenoxy)-3,4,9,10-perylene bisimide (3b) and N,N’-bis (5-carboxy-pentyl)-3,4,9,10-perylene bisimide (3c) are synthesized by the reaction of 6-amino-caproic acid and 3,4,9,10-perylene tetracarboxy anhydride (1) and its two derivatives (2a,2b) which are synthesized through inducing four phenoxy groups and four methylphenoxy groups at the positions 1,6,7,and 12 of 3,4,9,10-perylene tetracarboxy anhydride (1) respectively.Their structures are confirmed by IR,¹H-NMR and element analysis,Their photoscopic properties are characterized by UV-Vis absorption spectra and fluorescence spectra.The red shifts of 44 nm and 54 nm and Stokes shifts of 34.1 nm and 30.0 nm of perylene bisimides are attributed to the introduction of four phenoxy groups and four methyl-phenoxy groups at the positions 1,6,7,and 12 of 3,4,9,10-perylene tetracarboxy anhydride respectively,while decreases of their fluorescence quantum yields are not obvious.

Preparation Nano-TiO₂ by Hydrothermal Method and Its Application in Dye Sensitized Solar Cell

WANG Dong-bo, WU Ji-huai, HAO San-chun, LAN Zhang, YANG Hong-xun

2006, 24(3): 173-179. DOI: 10.7517/j.issn.1674-0475.2006.03.173

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A precursor was obtained by hydrolyzing tetrabutyl titanate in hydrochloric acid or acetic acid solution,anatase nano-TiO₂ powder was prepared from the precursor by hydrothermal method.Using the nano-TiO₂ as the electron transmission medium,a dye-sensitized solar cell(DSC) was assembled.The influence of nano-TiO₂ on the photoelectronic properties of the DSC was investigated by measuring XRD,ICP,SEM,TEM,DRS and I-V curve of the solar cell.The result show that the temperature of the hydrothermal play an important role in the photoelectric performance of the DSC,the anatase TiO₂ prepared in acetic acid solution shows higher photoelectric performance than others.

Preparation and Luminescence Property of Monodisperse Gd_xY_2-xO₃:Eu³⁺ Nanospheres

FENG Hua-jun, CHEN Yuan, TANG Fang-qiong, REN Jun, ZHANG Lin

2006, 24(3): 180-186. DOI: 10.7517/j.issn.1674-0475.2006.03.180

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Monodisperse Gd_xY_2-xO₃:Eu³⁺ nanoparticles are successfully synthesized by homogeneous precipitation method.SEM,TEM, XRD and photoluminescence(PL) spectra have been used to characterized the morphology,crystalline structure,and PL property of samples.By PL spectra, it is found that proper Gd³⁺ doping of Y₂O₃:Eu³⁺ can obviously enhance the PL intensity.When compared with combustion method,the max PL intensity is enhanced to some extent.But at the same time,the contents of costly Gd³⁺ decrease from 80% to 20%.In addition,the effect of Eu³⁺ concentration on PL enhancement has also been studied.

Synthesis and Photophysical Characteristics of a Novel Two-photon Absorption Unsymmetrical Ketocoumarin

LI Xue, WANG Tao, ZHAO Yu-xia, WU Fei-peng

2006, 24(3): 187-196. DOI: 10.7517/j.issn.1674-0475.2006.03.187

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A novel ketocoumarin derivative C3 presented a Dπ₁-A-π₂-D structure with diethylamino as the electron donor(D),carbonyl as the electron acceptor(A),coumarin and stilbene as the conjugating bridge was synthesized.Its photophysical characteristics were studied using UV-Vis and fluorescence spectra.The result showed that upon excitation compound C3 could form its intramolecular charge transfer state easily and furthermore transform to a twisted intramolecular charge transfer state accompanying with a very large change of dipole moment.The two-photon absorption cross-section of the new compound was measured by the up-converted fluorescence method with femtosecond laser pulses.It was obtained as 1292 GM at 850 nm,which is one to two orders of magnitudes larger than those of the reference compounds C1 and C2.

Photoinduced Hydroxyl Radicals and Photocatalytic Performance of Nd₂O₃/TiO₂ Photocatalysts

LI Hui-quan, CHEN Wei-fan, CUI Yu-min

2006, 24(3): 197-203. DOI: 10.7517/j.issn.1674-0475.2006.03.197

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Nd₂O₃/TiO₂ photocatalysts were prepared by sol-gel method using neodymium nitrate and tetrabutyl titanate as precursors,and characterized by means of XRD and BET.After the doped with Nd₂O₃,the particle diameter of catalyst was decreased,the specific surface area was increased,the formation rate of hydroxyl radical on the catalyst was increased,and the catalytic activity was improved.Using methyl orange as the model compound of the photocatalytic degradation reaction,the activity of the prepared photocatalysts was investigated in suspension irradiated by high-pressure mercury lamp;and the hydroxyl radical produced in the supernatant of the irradiated catalyst suspension containing terephthalic acid were also investigated by measuring the fluorescence derived by the reaction with terephthalic acid.As a result,the addition of Nd₂O₃ to TiO₂ notably enhanced its photocatalytic activity.The adsorption constants of methyl orange on the Nd₂O₃ doped catalysts and the nonmodified TiO₂ catalyst were evaluated,and the result showed the adsorption of methyl orange on the Nd₂O₃/TiO₂ catalysts was improved.The optimum loading amount of Nd ion is 1.0%(molar ratio).

Synthesis of Macrophotoinitiator Based on HAPK and Kinetics for Photopolymerization of TPGDA

XIAO Pu, WU Gang-qiang, SHI Su-qing, NIE Jun

2006, 24(3): 204-210. DOI: 10.7517/j.issn.1674-0475.2006.03.204

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Novel macrophotoinitiator (HTPTH) was synthesized via reaction of α-hydroxy alkylphenones (HAPK),toluene-2,4-diisocynate (TDI),polyethylene glycol 600 (PEG 600),and hydroxy ethyl acrylate (HEA).The reaction was followed using FTIR spectroscopy and the product was confirmed using FTIR.The kinetics for photopolymerization of tripropylene glycol diacrylate (TPGDA) using HTPTH as photoinitiator was studied by photo-DSC.It showed that HTPTH concentration and light intensity have similar effect on photopolymerization.The increase in HTPTH concentration and light intensity led to the increase in the polymerization rate and the final conversion.

Photosensitivity Realization of the Conventional PS Plate by N₂ Plasma Light Source Generated in Hollow Cathode Discharge

LI Chao-yang, CHEN Qiang, ZHANG Guang-qiu

2006, 24(3): 211-217. DOI: 10.7517/j.issn.1674-0475.2006.03.211

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In this paper,the possible PS exposure source based on a novel N₂ plasma generated in direct current hollow cathode discharge(HCD) is investigated.With the applied voltage 580 V,current 1.8 A and working pressure 70 Pa an optical power density of 0.46 mW/cm² is obtained,in which the conventional PS plate can be well photosensitized.As a result the efficiency of photosensitivity this source is discussed in detail from the color density change and the FTIR analysis on the coating material.

Synthesis and Application of Novel UV-Curable Adhesive Monomer

LIU Hui, LIU Lian, ZHANG Chun-qing

2006, 24(3): 218-224. DOI: 10.7517/j.issn.1674-0475.2006.03.218

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UV-curable adhesive monomer 10-methacryloyloxydecyl thiophosphoric acid dichloride was synthesized from the reaction of thiophosphoryl chloride with methylacrylic acid and 1,10-decanediol.The structure of product was characterized by ¹H-NMR, ³¹P-NMR,and FT-IR.The effect of this product on the bond durability of composite resin joined to Ti alloy or Co-Cr alloy was evaluated.The mixed solution of 10-methacryloyloxydecyl thiophosphoric acid dichloride,triethylamine and water significantly elevated the bond strengths of the composite resin joined to Ti alloy,Co-Cr alloy and shear strengths were 17.3 MPa,18.1 MPa respectively.

Synthesis and Luminescent Properties of Gd₃Al₅O₁₂:Eu³⁺ by Nitric-Citric Combustion Process

LUO Lan, LIU Qing-feng, LIU Qian, CHEN Yan-bo

2006, 24(3): 225-230. DOI: 10.7517/j.issn.1674-0475.2006.03.225

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Pure Gd₃Al₅O₁₂:Eu³⁺ crystalline phase was formed at 900℃ with the precursor prepared by nitric-citric combustion.The luminescent properties of Gd₃Al₅O₁₂:Eu³⁺ was also described,and the emission of Gd₃Al₅O₁₂:Eu³⁺ at 615 nm and 593 nm was considered to be the Eu³⁺ ⁵D₀-⁷F₂ and Eu³⁺ ⁵D₀-⁷F₂ transition.The Synthesis process was reported in details,related to the pH value,citric acid/metal ion and calcinations temperature.

Synthesis and Photographic Properties of Novel DAR couplers

LIU Yu-ting, YIN Da-wei, ZOU Jing, ZHANG Da-de, YAO Zu-guang

2006, 24(3): 231-235. DOI: 10.7517/j.issn.1674-0475.2006.03.231

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Two novel DAR couplers were synthesized in this paper,the structures were confirmed by elemental analysis,IR,MS,and ¹H-NMR.It was found that D₁ could increase sensitivity by 20%,but D₂ could not increase sensitivity by the research of it’s photographic properties.

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