Table of Content

15 January 2013, Volume 31 Issue 1

Previous Issue    Next Issue

Intramolecular Photodimerization of 2-Naphthalene-Labeled Poly(ethyl glycol) (N-P₄-N) Induced by γ-Cyclodextrin

CHENG Su-fang, CHEN Bin, ZHANG Li-ping, TONG Zhen-he(TUNG Chen-ho), WU Li-zhu

2013, 31(1):  1-9.  DOI: 10.7517/j.issn.1674-0475.2013.01.001

Asbtract ( 1482 )   PDF (865KB) ( 1792 )  

References | Related Articles | Metrics

Intramolecular photodimerization of 2-naphthalene-labeled poly(ethyl glycol) (N-P₄-N) induced by γ-cyclodextrin in aqueous solution was investigated. Regioselective and stereoselective photodimerization of N-P₄-N has been demonstrated to be controlled by γ-CD, and thus giving rise to anti-head-to-head intramolecular cubane-like photodimer as the sole product with 20.4% e.e. value.

Surface Photosensitive Modification of Calcium Carbonate and Application in UV-Curable Coating

LAI Jun-wei, YANG Jian-wen, LIU Xiao-xuan

2013, 31(1):  10-17.  DOI: 10.7517/j.issn.1674-0475.2013.01.002

Asbtract ( 1465 )   PDF (1083KB) ( 1717 )  

References | Related Articles | Metrics

A photosensitive resin fills S-2-E, based on succinic acid anhydride(SAA)、2-hydroxy-4-(2-hydr-oxyethoxy) -2-methylpropiophenone (D2959) and epoxidized oleic acid (EOA),was synthesized and used for modification of CaCO₃. Compared with the CaCO₃ modified by OA, the characterization of CaCO₃ modified by S-2-E、the optical activity of S-2-E-CaCO₃ and its effects on the properties of UV curing coating were studied by oil absorption value test、DPC、DMA and SEM.The results show that there are not so much differences between S-2-E and OA in modification of CaCO₃. And the CaCO₃ which become photosensitive after being modified by S-2-E, can cure with UV coating and make the properties of UV curing film better in hardness and water resistance.

Photocatalytic Hydrogen Production Using a Cyclometalated 4-(4-Tolyl)-6-Phenyl-2,2'-Bipyridyl Platinum(Ⅱ) Chloride Complex

WANG Ge-xia, FENG Ke, XING Ling-bao, SHI Xiao-yan, ZHANG Li-ping, TONG Zhen-ho(TUNG Chen-ho), WU Li-zhu

2013, 31(1):  18-23.  DOI: 10.7517/j.issn.1674-0475.2013.01.003

Asbtract ( 1536 )   PDF (517KB) ( 1610 )  

References | Related Articles | Metrics

A homogeneous system containing 4-(4-tolyl)-6-phenyl-2, 2'-bipyridyl platinum(Ⅱ) chloride 1 as a photosensitizer, a bis(dimethylglyoximate) Co(Ⅲ) complex as a catalyst, and TEOA as a sacrificial electron donor is designed for H₂ generation from water. With visible light irradiation(λ > 400 nm) for 19 h, more than 804 equivalents of H₂ per photosensiter were achieved, which is competitive with that obtained by platinum(Ⅱ) terpyridyl acetylide complex.

Synthesis and Photophysical Study of Hexa-peri-hexabenzocoronene Modified with PAMAM Dendrimers

WEI Heng-xing, ZENG Yi, CHEN Jin-ping, LI Ying-ying, LI Yi

2013, 31(1):  24-32.  DOI: 10.7517/j.issn.1674-0475.2013.01.004

Asbtract ( 1699 )   PDF (999KB) ( 2656 )  

References | Related Articles | Metrics

A series of hexa-peri-hexabenzocoronene(HBC) modified with PAMAM dendrimers, HBC-C₆-PAMAM-D_m(m=0.5, 1.5, 2.5), were synthesized and their structures were characterized by IR, ¹HNMR, ¹³CNMR and MALDI TOF mass spectra. Steady state photophysical studies of these compounds in tetrahydrofuran, acetonitrile, and dichloromethane indicated that HBC-C₆-PAMAM-D_mform aggregates in solution. The absorption and emission of HBC units are affected by the peripheral dendritic backbones due to the vibrational coupling between HBC and the dendritic moieties. The disorder of the vibrational state of HBC increases as dendrimer generation increases.

Synthesis and Electroluminescent Properties of 4-[4-((4-pyridyl)vinyl)styryl]-N,N- Dibutylbenzenamine

PAN Yue-li, LIU Hui-jun, WEI Wen-mei, ZHAO Zu-zhi

2013, 31(1):  33-41.  DOI: 10.7517/j.issn.1674-0475.2013.01.005

Asbtract ( 1302 )   PDF (923KB) ( 1873 )  

References | Related Articles | Metrics

The general synthesis and crystal structure of 4-[4-((4-pyridinyl)vinyl)styryl]-N,N-dibutylbenzenamine has been described in this paper. The UV, fluorescence spectra, fluorescence life-time, fluorescence quantum yield and electroluminescent properties have been investigated in detail. The compound crystallizes in the triclinic system, space group P-1,a=1.0101(3) nm, b=1.0352(2) nm, c=2.6220(5) nm, Z=4, V=2.4224(10) nm³, R₁=0.1006, wR₂=0.1818. The results show that this compound has potential applications in electroluminescence. CCDC number:815101.

Synthesis, Structure and Photophysical Properties of a 1,8-Naphthyridine-BF₂ Complex

QUAN Li, CHEN Yong, LU Xiao-jun, FU Wen-fu

2013, 31(1):  42-52.  DOI: 10.7517/j.issn.1674-0475.2013.01.006

Asbtract ( 1401 )   PDF (1960KB) ( 1701 )  

References | Related Articles | Metrics

The hydrazine ligand (H₂L) bearing naphthyridine moieties and its bis-BF₂ (C1) compound were designed and synthesized. The crystal structure analysis of C1 revealed that molecules in the cell were linked by C3-H3…F1 and C3-H3…F2 hydrogen bonds to form a 3D network structure. Spectroscopic properties of H₂L are sensitive to solvents. The absorption spectrum of H₂L in MeOH was blue-shifted with respect to that in CH₂Cl₂, and which can be restored upon addition of metal ions. C1 exhibits intense fluorescence in MeOH with a quantum yield of 0.92.

Photopolymerization Kinetics of 2, 2', 4-(2-Chlorophenyl)-5-(3, 4-Dimethoxyphenyl)-4', 5'-Diphenyl-1, 1'-Two Midazole Containing Initiator System

WU Wen-tao, MA Gui-ping, LU Jian, FANG Da-wei, QIAN Xiao-chun, NIE Jun, WANG Ke-min

2013, 31(1):  53-62.  DOI: 10.7517/j.issn.1674-0475.2013.01.007

Asbtract ( 1568 )   PDF (793KB) ( 1741 )  

References | Related Articles | Metrics

2, 2', 4-(2-chlorophenyl)-5-(3, 4-dimethoxyphenyl)-4', 5'-diphenyl-1, 1'-two imidazole (CZ-HABI) is a highly efficient UV initiator. Its characteristics were investigated by FTIR and ¹HNMR and UV absorption spectra. The compound photointiator systems consisted of photoinitiator 2,2',4-(2-chlorophenyl)-5-(3,4-dimethoxyphenyl)-4',5'-diphenyl-1,1'-two imidazole (CZ-HABI), photosensitizer 4,4'-bis (diethylamino)benzophenone(EMK) and hydrogen donor N-phenyl glycine (NPG). Real time infrared spectroscopy (RT-IR) was used to study the effect of polymerized kinetics of compound photointiator systems. The results indicated that basically no initiation efficient without hydrogen donor, while the effect of initiation efficient boosted greatly in the case of adding hydrogen donor. When concentration of compound photointiator systems increased, the conversion rate of the double bond can been enhanced. Its maximum polymerization rate accorded with the direct proportion relationship of R_p∝(PI)^{1/ 2}. The conversion rate of the double bond of the monomer and maximum reaction rate were enlarged accompanying with the light intensity strengthened. The final conversion rate of the double bond of diacrylate monomer was higher than that of triacrylate monomer. Initiator efficiency of complex photoinitiator system was better than conventional ITX/EDAB initiator system, and similar to initiator efficiency of 184, 1173.

Effect of the Nature of the Spacer on the Aggregation Properties of Gemini Cationic Surfactants in the Aqueous Solution Investigated by Fluorescence

JIANG Xiao-ming, ZHANG Wen-qian, SONG Lei, ZHAO Sui

2013, 31(1):  63-68.  DOI: 10.7517/j.issn.1674-0475.2013.01.008

Asbtract ( 1392 )   PDF (502KB) ( 1602 )  

References | Related Articles | Metrics

The values of cmc, N_agg and micelle micropolarity of the Gemini surfactants have been measured by fluorescence. The nature effect of the spacer on the aggregation properties of Gemini surfactants in the aqueous solution has been investigated. With the increae of spacer length, N_agg decreased, while the values of cmc, γ_cmc and the micelle micropolarity increased.

Progresses on Sensitization of Cationic Photoinitiators

ZHANG Hong, LI Jian-xiong, LIU An-hua

2013, 31(1):  69-78.  DOI: 10.7517/j.issn.1674-0475.2013.01.009

Asbtract ( 2145 )   PDF (1060KB) ( 3767 )  

References | Related Articles | Metrics

The curing rate and quantum efficiency of cationic photoinitiators are relatively low because the UV absorption of the photoinitiators ranges from 250 nm to 300 nm normally and does not match with the wavelength of light from UV light sources. To make the absorption red-shift, many efforts have been devoted onto the photosensitization of the photoinitiators. The achievements on the sensitization of the cationic photoinitiators have been summarized here. The sensitization is mainly based on the mechanisms as energy transfer, oxidation of free radical,electron transfer via exciplexes and addition fragmentation reaction. The methods adopted for the sensitization include adding photosensitizer,expanding molecular conjugation and attaching chromophore. The development of the photoinitiators and photosensitizers has been outlined and the applications of novel cationic photoinitiators and photosensitizers have been forecasted.