IMAGING SCIENCE AND PHOTOCHEMISTRY

Study of Microenvironment of Dendrimers with Nile Red as the Fluorescence Probe

ZHENG Shao-jun, ZENG Yi, LI Ming, LI Ying-ying, LI Yi

2009, 27(1): 1-7. DOI: 10.7517/j.issn.1674-0475.2009.01.1

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Carboxylic acid terminated poly(aryl ether) dendrimers Gn(n=1—4) were synthesized.The studies on absorption spectra of nile red in water and Gn potassium aqueous solution indicate that the solubility of nile red in water increases 3,35,47 and 215 times for generations 1-4,respectively,in the presence of Gn.The steady state and time resolved fluorescence studies reveal that the microenvironment polarity of Gn(n=1—4) is lower than water and G2-G4 have similar microenvironment polarity.

A Highly Sensitive Colorimetric Chemosensor for Iron(Ⅱ) and Iron(Ⅲ) Ions

WANG Jun, XU Quan-qing, CHI Shao-ming, ZHANG Hui-miao, FU Wen-fu

2009, 27(1): 8-15. DOI: 10.7517/j.issn.1674-0475.2009.01.8

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In this work a new compound(E)-4’-(4-(2-(2-naphthalenyl)vinyl)phenyl)-2,2’:6’,2”-terpyridine L was synthesized,characterized and used to recognize iron ions.Upon addition of Fe(II) or Fe(III),the solution(V(CHCl3):V(ethanol)=1:20) of L can show magenta or orange-red color in visible region,respectively.And in the UV-vis spectrum of L in solution there emerge two characteristic peaks at 374 and 574 nm.Furthermore,the response of L to iron ions is highly sensitive and selective even though in the presence of other metal ions.The limit of detection(LOD) and linear concentration range for iron(II)/iron(III) and iron(II+III) were studied,too.

The Spectroscopic Behavior of Dicyanovinyldithienothiophenes

ZHAO Chun-mei, XU Li, SHI Jian-wu, WANG Hua

2009, 27(1): 16-22. DOI: 10.7517/j.issn.1674-0475.2009.01.16

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Two conjugated D-A compounds,2-dicyanovinlydithieno[3,2-b:2’,3’-d]thiophene(DCTT) and 2-dicyanovinlydithieno[2,3-b:3’,2’-d]thiophene(DCST) were synthesized and characterized.The relationship between the emission properties and molecular structures was studied by investigation of solvent effect for DCTT and DCST.Both title compounds show intramolecular charge transfer(ICT) state emission.With the increase of polarity of solvents,DCST shows ICT emission with strong red shift and larger Stokes shift.However,DCTT shows weak red shift but negative solvatochromism: an increase of quantum yields from ICT emission,which may due to the Proximity effect between the transitions of π-π^* and n-π^*.Such emission difference between DCTT and DCST shows that the ICT state could be occurred in both compounds,but charge separation might not be formed easily between moiety of thieno[3,2-b:2’,3’-d]thiophene and moiety of dicyanovinyl in DCTT,however,formed easily between moiety of thieno[2,3-b:3’,2’-d]thiophene and moiety of dicyanovinyl in DCST.

New Selective Fe³⁺ and Hg²⁺ Ions Chemosensors Based on Anthracenecarbonamide Derivatives

XU Quan-qing, WANG Jun, ZHANG Hui-miao, FU Wen-fu

2009, 27(1): 23-31. DOI: 10.7517/j.issn.1674-0475.2009.01.23

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Two synthesized compounds,N-(6-aminopyridine2-yl)-9-anthracenecarbonamide(L¹) and N,N’-(pyridine-2,6-yl)-bis(9-anthracenecarbonamide)(L²) are found to show good sensitivity and selectivity to Fe³⁺ and Hg²⁺ ions,respectively.L¹ shows highly sensitive response to Fe³⁺ on fluorescence spectrum.The recognition of L² to Hg²⁺ could be achieved by using absorption and fluorescence spectra.The effect of the presence of other metal ions on sensing for the aim ions were studied too.In addition,the coordination models of these two compounds with metal ions were suggested.

"A-C≡C-TTF-C≡C-A" Tetrathiafulvalene Derivative:Synthesis and Property

GENG Yan, CHEN Bin, TONG Zhen-he(TUNG Chen-ho), WU Li-zhu

2009, 27(1): 32-37. DOI: 10.7517/j.issn.1674-0475.2009.01.32

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Owing to unique π electron-donating-properties,tetrathiafulvalene(TTF) and its derivatives have been extensively studied over the past decade.In the present work,tetrathiafulvalene acetylene derivative [A-C≡C-TTF-C≡C-A],4,4’(5’)-bis(4-pyridylethynyl)tetrathiafulvalene (TTF4N),has been synthesized to provide insight into the nature of the donor-acceptor interaction via triple bonds.Spectroscopic,electrochemical and Pb²⁺-binding studies demonstrate that the TTF unit interacts with electron-accepting pyridine groups via triple bonds,thus leading to intramolecular charge transfer.Moreover,TTF4N show remarkable sensing and coordinating properties toward Pb²⁺.

Preparation、Characterization and Photocatalytic Activities of Low Amount La³⁺-doped S-TiO₂ Photocatalysts

LI Hui-quan, FAN Yi-ning, DONG Kun-ming, JIN Feng, CHEN Shui-sheng

2009, 27(1): 38-47. DOI: 10.7517/j.issn.1674-0475.2009.01.38

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La³⁺/S-TiO₂ were prepared by sol-gel-impregnation method and characterized by means of XRD、BET、XPS and UV-Vis.Activities of prepared nano-photocatalysts were evaluated by decolorizing methyl orange solution as model compound to photocatalytic degradation.The mechanisms of effects of low amount La³⁺-doping on the photocatalytic activity of TiO₂ nano-particles were discussed.The results show that S-doping can significantly enhance the photocatalytic activity of TiO₂ nano-particles and La³⁺doped S-TiO₂ can further enhance the photocatalytic activity of TiO₂ nanoparticles.Under optimal addition amount of La³⁺ into TiO₂ 0.369%(mass fraction),decolorizing rate of methyl orange on La³⁺/S-TiO₂ nano-photocatalyst was 92.4% after 120 min irradiation.The analytical results of XRD show that the presence of low amount of La³⁺in TiO₂ can inhibit the phase transformation from anatase to rutile,suppress the growth of TiO₂ grains and raise the specific surface area.The analytical results of XPS indicate that S、La³⁺ doping can result in the increase in the density of the surface hydroxyl,and cationic S⁶⁺ is incorporated into TiO₂ lattice and substitutes a part of Ti⁴⁺.The analytical results of UV-Vis indicate that the La³⁺/S-TiO₂ catalyst has stronger absorption in the ultraviolet region than the pure TiO₂.Compared with pure TiO₂,the enhanced photocatalytic activity of the La³⁺ doped TiO₂ nano-powders can be due to the increase of the density of the surface hydroxyl and the specific surface area,and the improvement of the ultraviolet light absorption properties of the particle surface.

Preparation and Characterization of WO₃ Nano-Powders

MENG Qing-hua, YU Xin, ZHU Yi-ren

2009, 27(1): 48-56. DOI: 10.7517/j.issn.1674-0475.2009.01.48

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The WO₃ nano-powders have been prepared by method of gas-liquid reaction in this work.The techniques such as solid UV/vis spectra,XRD,TEM,SEM,EDS were used to characterize the catalyst.Effects of glycol concentration along with the adding of surfactant SDBS on the particle size and the morphology of the photocatalysts were discussed in detail.The photoelectrochemical actions of WO₃ powders were studied by degradating the phenol.It was showed that when the proportion between water and glycol is 25:75,The size of WO₃ powders is about 30 nm and sheet WO₃ which diameter is about 80 nm can be obtained by adding 0.1 g surfactant.Both of them have much better photocatalytic activities than the product from market.

Electrostatic Self-Assembly Multilayer Films of B-PE and Its Spectrum Characteristic

ZHOU Lin, HU Jin-mei, GUO Si-yuan

2009, 27(1): 57-62. DOI: 10.7517/j.issn.1674-0475.2009.01.57

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B-Phycoerythrin was an novel bio-photoelectronic material.Multilayer films formed of PDAA and B-PE were prepared by electrostatic self-assembly method.Visible absorption spectrum and fluorescent spectrum of the multilayer films were studied.The result showed the maximum absorption peak occurred red shift from 545 nm to 553 nm,and a delayed fluorescence peak at 573 nm was observed,the maximum absorption and photoluminescence intensity increases in proportion to the assembled layers.With the increase of the self-assembly layers,Obvious aggregate of B-PE was observed on the film by Inverted Microscope Eclipse.

Study on the Photosynthesis of Oxazolidinone

ZHANG Rong-hua, GU Jia-min, ZHU Zhi-liang, JIANG Zhiqin

2009, 27(1): 63-68. DOI: 10.7517/j.issn.1674-0475.2009.01.63

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The photochemical method was used to replace the traditional method,such as the metal catalyst,to synthesize the important drug intermediate oxazolidinone.The advantages of this procedure were high yields,mild reaction conditions,simple protocol,and clean.At the same time,the effects of three different solvents acetone,methanol,acetonitrile on the yields of the products were studied.The stereo-selectivity was increased with the enlargement of the polarity of solvents.

The Discovery and Development of the Green Fluorescent Protein

WU Shi-kang

2009, 27(1): 69-78. DOI: 10.7517/j.issn.1674-0475.2009.01.69

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In this paper,the principle subject of the Nobel’s Prize in Chemistry in 2008—The Green Fluorescent protein has been introduced briefly.It consists of the discovery,development and the deep significance of this subject.The GFP-like proteins can use to monitor in time and space of an ever-increasing number of phenomena in living cells and organisms like gene expression,protein localization and dynamics.So,it is able to say that the discovery of GFP is concerned with a technical revolution in Biological science.

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