中国化学快报

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Free radical mediated bromization of methylenecyclopropanes:Preparation of 2,4-dibromobutenes without transition metal

Lei Yu, Bo Chen, Xian Huang, Lu Ling Wu

中国化学快报. 2007, 18(02): 121-123. https://doi.org/10.1016/j.cclet.2006.12.004

摘要 ( )

可视化

A series of 2,4-dibromobutenes were synthesized by the reaction of methylenecyclopropanes with KBr in HOAc in the presence of dibenzoyl peroxide, providing an environment friendly method for the synthesis of 2,4-dibromobutenes.

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Synthesis and antitumor activity of water-soluble poly(aminoheterocyclic amine)s (Ⅰ):N,N,N',N'-tetra[2-(4-amino-5-substituted-s-triazol-3-yl sulfanyl)ethyl]-1,4-benzyldiamine salts

Guo Qiang Hu, Song Qiang Xie, Wen Long Huang

中国化学快报. 2007, 18(02): 124-126. https://doi.org/10.1016/j.cclet.2006.12.001

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Five water-soluble poly(aminoheterocyclic amine)s containing s-triazole ring were synthesized as respective HCl salts (5a-5e).Biological activities in L1210 (murine leukemia) and Chinese hamster ovary (CHO) cell lines were investigated via IC₅₀cytotoxicity determinations. The title compounds represented moderate cytotoxicity (low IC₅₀ values between 15 and 68 μmol/L)in L1210 but high cytotoxicity (lower IC₅₀ values:0.25, 0.018, 0.014 μmol/L for 5a-5e, respectively) in CHO cell lines, while the corresponding HCl salts of the intermediates (3a-3e) without polyamine tether and starting materials amino-s-triazoles (1a-1e)showed poor or no activities against the above cell lines.

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Rhodium-catalyzed asymmetric ring opening of azabenzonorbornadiene with substituted piperazine nucleophiles

Lei Xie, Ding Qiao Yang, Shuang Qi Zhao, Huan Wang, Li Hua Liang, Ren Shi Luo

中国化学快报. 2007, 18(02): 127-129. https://doi.org/10.1016/j.cclet.2006.12.003

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We have developed an asymmetric ring opening reaction of azabenzonorbornadiene with substituted piperazine. By increasing the amount of catalyst (from 2.5 to 5%) and ligands (5 to 10%) as well as addition of ammonium iodide, the products can be obtained in high yield and the reaction time shortened dramatically, but the ee values were rather low.

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A facile electrochemical synthesis of caffeic acid derivatives in the presence of acetylacetone or methyl acetoacetate in aqueous medium

Cheng Chu Zeng, Li Ming Hu, Jia Zeng, Ru Gang Zhong

中国化学快报. 2007, 18(02): 130-132. https://doi.org/10.1016/j.cclet.2006.12.010

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The anodic oxidation of caffeic acid in the presence of acetylacetone or methyl acetoacetate in aqueous solution has been studied by cyclic voltammetry and controlled-potential electrolysis techniques. The result showed that caffeic acid was oxidized to the corresponding o-benzoquinone, which underwent further Michael-addition with acetylacetone or methyl acetoacetate to produce caffeic acid derivative 3,4-dihydroxy-6-(1-acetylacetone)-yl cinnamic acid 4a or 3,4-dihydroxy-6-(1-acetyl-methylacetate)-ylcinnamic acid 4b.

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Aerobic oxidation assisted by ligand-free palladium catalysts

Jia Rui Wang, Chu Ting Yang, Lei Liu, Qing Xiang Guo

中国化学快报. 2007, 18(02): 133-136. https://doi.org/10.1016/j.cclet.2006.12.005

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Aerobic oxidation of electron-rich benzylic and phenyl allylic alcohols was achieved with high yields with only 0.1 mol.% of Pd(OAc)₂ catalyst in the absence of any ligand. This procedure was expected to be valuable for realistic industrial-scale applications from both economic as well as environmental points of view.

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Regioselective synthesis and anti-HIV activity of the novel 2-and 4-substituted pyrazolo[4,5-e] [1,2,4]thiadiazines

Xin Yong Liu, Ren Zhang Yan, Nian Gen Chen, Wen Fang Xu

中国化学快报. 2007, 18(02): 137-140. https://doi.org/10.1016/j.cclet.2006.12.006

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The new regioisomer 7-methyl-pyrazolo[4,5-e] [1,2,4]thiadiazine nucleus (5) was synthesized, and its novel mono-N₂-or N₄-substituted pyrazolo[4,5-e] [1,2,4]thiadiazines (6, 7) were regioselectively prepared by deprotonation of NN₂ or/and N₄ atoms with different molar ratio of NaH and alkyl halides. Anti-HIV-1 screening tests showed some compounds to be potent as HIV-1 nonnucleoside reverse transcriptase inhibitors (HIV-1 NNRTIs).

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A new series of emodin derivatives with bone affinity

Hong Chen, Ying Wang, Ling Leng, Mao Sheng Cheng, Peng Fei Yu, Jing Ze Zhang

中国化学快报. 2007, 18(02): 141-144. https://doi.org/10.1016/j.cclet.2006.12.021

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A new series of bone affinity compounds were synthesized by linking emodin with 5-fluorouracil derivatives. Their bone affinities were established by hydroxyapative (HA) affinity experiment in vitro, and their cytostatic effects were shown by the MTT assay.

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Synthesis of cystine C₆₀ derivative and its protective effects on hydrogen peroxide-induced apoptosis in PC12 cells

Zhen Hu, Hai Ping Xing, Zhou Zhu, Wei Wang, Wen Chao Guan

中国化学快报. 2007, 18(02): 145-148. https://doi.org/10.1016/j.cclet.2006.12.023

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Oxidative stress has been considered as a major cause of cellular injuries in a variety of clinical abnormalities, especially prominent in neural diseases. One of the usable ways to prevent the reactive oxygen species (ROS)-mediated cellular injury is dietary or pharmaceutical augmentation of some free radical scavenger. Water-soluble amino-fullerene is a novel compound that behaves as a free radical scavenger with excellent biology consistent. In the present study, we have synthesized and characterized a novel cystine C₆₀ derivative for the first time, and investigated the effects on hydrogen peroxide-induced oxidative stress and apoptotic death in cultured rat pheochromocytoma (PC12) cells. PC12 cells treated with hydrogen peroxide underwent apoptotic death as determined by MTT, PI/Hoechst 33342 staining and flow cytometry analysis. These results suggested that cystine C₆₀ derivative has the potential to prevent oxidative stress-induced cell death and has no evident toxicity.

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Synthesis of methyl N-phenyl carbamate from dimethyl carbonate and 1,3-diphenyl urea under mild conditions

Jun Jie Gao, Hui Quan Li, Yi Zhang

中国化学快报. 2007, 18(02): 149-151. https://doi.org/10.1016/j.cclet.2006.12.014

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Synthesis of methyl N-phenyl carbamate from dimethyl carbonate and 1,3-diphenyl urea was investigated under atmospheric pressure. The results showed that homogenous catalyst sodium methoxide had the excellent activity to efficiently catalyze the synthesis of methyl N-phenyl carbamate under atmospheric pressure.

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A new alkaloid from Stemona sessilifolia

Peng Wang, Hai Lin Qin, Zhi Hong Li, Ai Lin Liu, Guan Hua Du

中国化学快报. 2007, 18(02): 152-154. https://doi.org/10.1016/j.cclet.2006.12.007

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A new alkaloid, named sessilistemonamine D, was isolated from the roots of Stemona sessilifolia and the structure and relative configuration were determined on the basis of NMR and MS spectrometric data analysis.

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Two new phenylethanoid glycosides from the roots of Phlomis umbrosa

Pu Liu, Yoshihisa Takaishi, Hong Quan Duan

中国化学快报. 2007, 18(02): 155-157. https://doi.org/10.1016/j.cclet.2006.12.019

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Two new phenylethanoid glycosides were isolated from the roots of Phlomis umbrosa. Their structures were elucidated by spectroscopic methods.

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New flavone and isoflavone glycoside from Belamcanda chinensis

Li Jin, Hai Sheng Chen, Zhao Bao Xiang, Shuang Liang, Yong Sheng Jin, Jian Guo Liu

中国化学快报. 2007, 18(02): 158-160. https://doi.org/10.1016/j.cclet.2006.12.031

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The new flavone, 5,4'-dihydroxy-6,7-methylenedioxy-3'-methoxyflavone, and one new isoflavone glycoside, 3',5'-dimethoxy irisolone-4'-O-β-D-glucoside were isolated from the rhizomes of Belamcanda chinensis. Their structures were established based on the spectroscopic methods.

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A new triterpene glycoside from sea cucumber Holothuria leucospilota

Hua Han, Yang Hua Yi, Ling Li, Xiao Hua Wang, Bao Shu Liu, Peng Sun, Min Xiang pan

中国化学快报. 2007, 18(02): 161-164. https://doi.org/10.1016/j.cclet.2006.12.027

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A new triterpene glycoside, leucospilotaside A, along with a known saponin, isolated from sea cucumber Holothuria leucospilota, and its structure was elucidated as 3β-O-[4-O-sodiumsulfate-β-D-quinovopyranosyl-(1→2)-β-D-xylopyranosyl]-holosta-22-ketone-9-en-17α,25α-diol (1) by extensive spectroscopic analysis and chemical methods. Leucospilotaside A (1) has a ketone carbonyl group (22) in the aglycon side chain.

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Hydroxylation of nigranoic acid to 6β-hydroxynigranoic acid by Caryospora carllicarpa YMF1.01026

Jin Yan Dong, Ye Gao Chen, Hong Chuan Song, Yan Ping He, Lei Li, Yong Ping Zhong, Yan Hui Zhu, Jie Cao, Luo Wang, Ke Qin Zhang

中国化学快报. 2007, 18(02): 165-167. https://doi.org/10.1016/j.cclet.2006.12.020

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可视化

Microbial transformation of nigranoic acid by Caryospora carllicarpa YMF1.01026 afforded the new derivative 6β-hydroxynigranoic acid. Its structure was elucidated by spectroscopic methods.

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Neolignan glycoside from Angelica dahurica

Xing Zeng Zhao, Xu Feng, Xiao Dong Jia, Yun Fa Dong, Ming Wang

中国化学快报. 2007, 18(02): 168-170. https://doi.org/10.1016/j.cclet.2006.12.011

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A new neolignan glycoside, 4-O-β-D-glucopyranosyl-9-O-β-D-glucopyranosyl-(7R, 8S)-dehydrodiconiferyl alcohol was isolated from the fresh roots of Angelica dahurica. The structure of the new compound was elucidated on the basis of spectral analysis.

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Two new saponins from Anemarrhena asphodeloides Bge

Ying Peng, Yu Jing Zhang, Zhi Qiang Ma, Wei San Pan, Yu Qing Sun, Shao Jiang Song

中国化学快报. 2007, 18(02): 171-174. https://doi.org/10.1016/j.cclet.2006.12.009

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Two new saponins 3-O-β-D-glucopyranosyl (1→2)-β-D-mannopyranosyl sarsasapogenin, named timosaponin A Ⅳ(1) and(5β, 25S)-26-O-β-D-glucopyranosyl-furost-20(22)-en-3,26-diol-3-O-β-D-glucopyranosyl (1→4) glucopyranosyl (1→2)-β-D-galacopyranoside, named timosaponin B Ⅳ(2), were isolated by silica gel column chromatography and preparative HPLC from Anemarrhena asphodeloides Bge. Their structures were elucidated by chemical characters and spectroscopic analysis.

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A new veratramine alkaloid from the bulbs of Fritillaria hupehensis

Yong Hui Zhang, Xi Liang Yang, Xue Feng Zhou, Han Li Ruan, Hui Fang Pi, Ji Zhou Wu, Han Dong Sun, Tetsuro Fujita

中国化学快报. 2007, 18(02): 175-177. https://doi.org/10.1016/j.cclet.2006.12.037

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A new highly conjugated alkaloid of veratramine type, 22S,25S,5α-veratramine-7(8), 12(14)-diene-3β,13β,23β-triol-6-one (1),was isolated from the bulbs of Fritillaria hupehensis Hsiao et K.C. Hsia. Its structure was determined on the basis of spectroscopic evidences.

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Two new aristolane sesquiterpenes from Laurencia similis

Nai Yun Ji, Xiao Ming Li, Lan Ping Ding, Bin Gui Wang

中国化学快报. 2007, 18(02): 178-180. https://doi.org/10.1016/j.cclet.2006.12.043

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Two new aristolane sesquiterpenes, namely, aristolan-10-ol-9-one and aristolan-8-en-1-one, were isolated from the red alga Laurencia similis. Their structures were established on the basis of various NMR spectroscopic analyses, including 2D NMR techniques (¹H-¹H COSY, HMQC, HMBC, and NOESY) and HR-FAB-MS.

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New ceramides from the flower of Albizia julibrissin

Jian Kang, Chang Hong Huo, Zhe Li, Zuo Ping Li

中国化学快报. 2007, 18(02): 181-184. https://doi.org/10.1016/j.cclet.2006.12.042

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A new ceramide and its glycoside were isolated from the flower of Albizia julibrissin. Their structures were established as (2S,3S,4R,8E)-2-[(2'R)-hydroxyhexadecanoylamino]-8-tetra-cosene-1,3,4-triol (Ⅰ) and 1-O-β-D-glucopyranosyl-(2S,3S,4R,8E)-2-[(2'R)-hydroxy-hexade-canoylamino]-8-tetracosene-1,3,4-triol (II) on the basis of chemical and spectroscopic studies.

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Organic/inorganic nanocomposite polymer electrolyte

Li Qi, Shao Jun Dong

中国化学快报. 2007, 18(02): 185-188. https://doi.org/10.1016/j.cclet.2006.12.038

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The organic/inorganic nanocomposites polymer electrolytes were designed and synthesized. The organic/inorganic nanocom posites membrane materials and their lithium salt complexes have been found thermally stable below 200℃. The conductivity of the organic/inorganic nanocomposites polymer electrolytes prepared at room temperature was at magnitude range of 10^-6 S/cm.

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A novel sensitive non-enzymatic glucose sensor

Xin Huang Kang, Zhi Bin Mai, Xiao Yong Zou, Pei Xiang Cai, Jin Yuan Mo

中国化学快报. 2007, 18(02): 189-191. https://doi.org/10.1016/j.cclet.2006.12.034

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Cu nanoclusters were electrochemically deposited on the film of a Nafion-solubilized multi-wall carbon nanotubes (CNTs) modified glassy carbon electrode (CNTs-GCE), which fabricated a Cu-CNTs composite sensor (Cu-CNTs-GCE) to detect glucose with non-enzyme. The linear range is 7.0×10^-7 to 3.5×10^-3 mol/L with a high sensitivity of 17.76 μA/(mmol L), with a low detection limit 2.1×10^-7 mol/L, fast response time (within 5 s), good reproducibility and stability.

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Facile O-alkylation of highly hydrophilic hyperbranched polyglycerol

De Cheng Wan, Jun Jie Yuan, Zheng Long Yang, Hong Ting Pu

中国化学快报. 2007, 18(02): 192-194. https://doi.org/10.1016/j.cclet.2006.12.035

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A facile and selective route for O-alkylation of highly hydrophilic, multifunctional hyperbranched polyglycerol (PG) under nonaqueous phase transfer catalyzed conditions in dimethyl sulfoxide was developed, through which several kinds of groups were introduced onto PG.

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Determination of trace calcium by solid substrate-room temperature phosphorimetry

Jia Ming Liu, Tian Long Yang, Xiao Mei Huang, Xiu Mei Shi, Zhong Bin Shi, Hong Wu, Guo Hui Zhu, Zhi Ming Li, Cui Lian Chen

中国化学快报. 2007, 18(02): 195-197. https://doi.org/10.1016/j.cclet.2006.12.016

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A new method for the determination of trace calcium by solid substrate-room temperature phosphorimetry is established. It is based on the fact that chromeazurols azurol S-phenanthroline-NaCMC (CAS-phen-NaCMC) system can emit strong and stable room temperature phosphorescence (RTP) on the solid substrate in the filter paper. Ca²⁺ and phenanthroline can form complex ion Ca(phen)₃²⁺, which will form complex [Ca(phen)₃(CAS)₂] with CAS. In the result, the number of CAS molecules in each spot increased, causing sharp increase of the RTP signal of the CAS-phen-NaCMC system.

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Highly sensitive ECL-PCR method for detection of K-ras point mutation

De Bin Zhu, Da Xing, Ya Bing Tang

中国化学快报. 2007, 18(02): 198-200. https://doi.org/10.1016/j.cclet.2006.12.017

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A highly sensitive electrochemiluminescence-polymerase chain reaction (ECL-PCR) method for K-ras point mutation detection is developed. Briefly, K-ras oncogene was amplified by a Ru(bpy)₃²⁺ (TBR)-labeled forward and a biotin-labeled reverse primer,and followed by digestion with MvaI restriction enzyme, which only cut the wild-type amplicon containing its cutting site. The digested product was then adsorbed to the streptavidin-coated microbead through the biotin label and detected by ECL assay. The experiment results showed that the different genotypes can be clearly discriminated by ECL-PCR method. It is useful in point mutation detection, due to its sensitivity, safety, and simplicity.

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Determination of neomycin in water samples by high performance anion chromatography with pulsed amperometric detection

Bin Guan, Dong Xing Yuan

中国化学快报. 2007, 18(02): 201-204. https://doi.org/10.1016/j.cclet.2006.12.022

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A simple, fast and reliable method, using high performance anion chromatography with pulsed amperometric detection, had been developed for the analysis of neomycin in water samples. The elution and separation were carried out with an isocratic mobile phase, containing 10 mmol/L NaOH. The influence of the concentration and pH of the mobile phase on the separation and detection was investigated. A quadruple-potential waveform used for the detection was optimized. The detection limit of neomycin was down to 0.027 μg/mL. The linearity of neomycin calibration curve ranged from 0.050 to 0.505 μg/mL with correlation coefficient of0.9997. R.S.D. (n=11) was 4.0%.

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Study on the bioactivity changes of hydroxylated sulfonylureas derivatives:A possible metabolism

Shu Rong Ban, Cong Wei Niu, Wen Bin Chen, Zhi Hong Yu, Si Wu, Chen Wang, Zhen Xi

中国化学快报. 2007, 18(02): 205-208. https://doi.org/10.1016/j.cclet.2006.12.012

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可视化

Some new sulfonylureas and their hydroxylation products had been synthesized from 2-amino-4-methylpyrimidine. Their bioactivities against E. Coli AHAS Ⅱ in vitro were tested and the results indicated that the hydroxylation decreased the inhibition activities of sulfonylureas significantly. Subsequently herbicidal tests against stem-growth of barnyard grass and root-growth of rape confirmed the above conclusion. The preliminary molecular docking studies were also carried out to investigate the binding modes of non-hydroxylated and hydroxylated sulfonylureas with AHAS.

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Synthesis and properties of novel aliphatic polycarbonate from carbon dioxide with 1,2-butylene oxide and ε-caprolactone

Yan Fei Liu, Ke Long Huang, Dong Ming Peng, Su Qin Liu, Hong Wu

中国化学快报. 2007, 18(02): 209-212. https://doi.org/10.1016/j.cclet.2006.12.002

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A new degradable aliphatic poly(butylene-co-ε-caprolactone carbonate) (PBCL) was synthesized through the terpolymerization of carbon dioxide, 1,2-butylene oxide (BO) and ε-caprolactone (CL), a polymer supported bimetallic complex (PBM) was used as a catalyst. The terpolymers prepared were characterized by FT-IR, ¹H NMR, ¹³C NMR, WXRD and DSC. The hydrolysis tests were carried out to appraise the degradability of the copolymers.

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Preparation and characterization O-lauroyl chitosan/poly (L-lactic acid) blend membranes by solution-casting approach

Yao Zu Liao, Mei Hua Xin, Ming Chun Li, Sheng Su

中国化学快报. 2007, 18(02): 213-216. https://doi.org/10.1016/j.cclet.2006.12.024

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O-Lauroyl chitosan/poly(L-lactide) (OCS/PLLA) blend membranes with different compositions were prepared by solutioncasting approach using chloroform as common solvent. The experimental results of FT-IR, DSC and WAXD indicated that interassociation hydrogen-bond interactions existed between OCS and PLLA in the blend membranes. And SEM observation confirmed that the blend membranes with suitable compositions were compatible.

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The effect of polymerization conditions on crystalline of polybutene-1 catalyzed by metallocene catalyst

Qi Gu Huang, Ya Ping Sheng, Kun Xue Deng, Li Fu Ma, Yi Xian Wu, Wan Tai Yang

中国化学快报. 2007, 18(02): 217-220. https://doi.org/10.1016/j.cclet.2006.12.030

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Polybutene-1 was synthesized stereoselectively with the precursor η⁵-(pentamethyl-cyclopentadienyl) tribenzyloxide titanium (Cp^*Ti(Obz)₃) and methylaluminoxane (MAO). The effects of polymerization conditions, trimethyl alumina (TMA) content in MAO and temperature on the crystalline and molecular weight of the products, and catalytic activity were investigated. The structural properties of the polybutene-1 were characterized with ¹³C NMR and WAXD.

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Fabrication of a novel poly(dimethylsiloxane) microchips with two sharpened stretching tips

Chun Ye Liu, Xu Xu, Hong Jun Gao, Jie Rong Chen

中国化学快报. 2007, 18(02): 221-224. https://doi.org/10.1016/j.cclet.2006.12.036

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An integrated poly(dimethylsiloxane) (PDMS) microchip with two sharpened stretching has been presented. The sample was directly introduced into the separation channel through the stretching inlet tip without complicated power switching supplies and without injection cross-channel. Operations of running buffer refreshing or channel cleaning also becomes simple by vacuumed in one end and placed another tip into solution vial. The fabrication method can be easily applied in most analytical laboratories at low cost in the absence of soft lithography and plasma bonding equipments. Characteristics of the chips were tested and it can be used to separate fluorescence labeled molecules.

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Cure reaction and phase behavior of liquid crystalline epoxides-anhydride systems

Li Yan Liang, Shao Ping Ren, Yi Quan Zheng, Man Geng Lu

中国化学快报. 2007, 18(02): 225-228. https://doi.org/10.1016/j.cclet.2006.12.040

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可视化

A series of novel liquid crystalline epoxides with lateral substituents were cured with anhydrides and the cure kinetics was investigated by non-isothermal DSC technique. The results showed that the lengths of lateral substituents have great effect on the value of E_a. The curing reaction became less active, when the liquid crystalline epoxides have long lateral substituents and were controlled by diffusion at the late stage of cure. A nematic structure was observed by POM and XRD.

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Studies on the synthesis and properties of malachite green imprinted polymer

Li Qiang Su, Shi Qiao, Wei Bing Zhang

中国化学快报. 2007, 18(02): 229-232. https://doi.org/10.1016/j.cclet.2006.12.013

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A new molecularly imprinted polymer was synthesized with malachite green (MG) as molecular template, methacrylic acid (MAA) as functional monomer, ethylene dimethacrylate (EDMA) as crosslinker, and azobisisobutyronitrile (AIBN) as initiator.Recognition properties of the MG imprinted polymer were studied by equilibrium adsorption and HPLC. The results showed that the imprinted polymer had good affinity and marked selectivity for MG, and can separate MG with its analogue commendably. The new polymer can be used for the enrichment of MG in complex sample, and can work as separation media to separate and detect MG by HPLC.

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Equilibrium and kinetic studies on the adsorption of VB₁₂ onto CMK-3

Zhuo Guo, Li Feng Wang, Zhan Gao, Wei Wei Zhang

中国化学快报. 2007, 18(02): 233-236. https://doi.org/10.1016/j.cclet.2006.12.032

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The adsorption of VB₁₂ onto CMK-3 was studied as a function of temperature and initial VB₁₂ concentration. The highest VB₁₂adsorption capacity was determined as 353.4 mg/g at 40℃. Adsorption data were well described by the Langmuir model, although they could be modelled by the Freundlich equation. The pseudo-first-order and pseudo-second-order kinetic models were applied to test the experimental data. The pseudo-second-order kinetic model provided the best correlation of the experimental data compared to the pseudo-first-order model.

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A novel synthetic route for LiFePO₄/C cathode materials by addition of starch for lithium-ion batteries

Shao Hua Luo, Zi Long Tang, Jun Biao Lu, Zhong Tai Zhang

中国化学快报. 2007, 18(02): 237-240. https://doi.org/10.1016/j.cclet.2006.12.041

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可视化

LiFePO₄/Carbon composite cathode material was prepared using starch as carbon source by spray-pelleting and subsequent pyrolysis in N₂. The samples were characterized by XRD, SEM, Raman, and their electrochemical performance was investigated in terms of cycling behavior. There has a special micro-morphology via the process, which is favorable to electrochemical properties.The discharge capacity of the LiFePO₄/C composite was 170 mAh g^-1, equal to the theoretical specific capacity at 0.1 C rate. At4 C current density, the specific capacity was about 80 mAh g^-1, which can satisfy for transportation applications if having a more flat discharge flat.

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Gas-phase photocatalytic oxidation of benzene over titanium dioxide loaded on Bi₁₂TiO₂₀

Tao Lin, Zhan Pi, Mao Chu Gong, Jun Bo Zhong, Jian Li Wang, Yao Qiang Chen

中国化学快报. 2007, 18(02): 241-243. https://doi.org/10.1016/j.cclet.2006.12.008

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TiO₂ was prepared by sol-gel method using tetrabutyl titanate as precursor. TiO₂ was loaded on Bi₁₂TiO₂₀. The photocatalyst with different TiO₂ loading was calcined at 723 K. The photocatalytic activity of decomposition gaseous benzene was investigated in a batch reactor. The prepared photocatalyst was characterized by UV-vis diffuse reflectance. The result showed that TiO₂/Bi₁₂TiO₂₀ absorbed much more ultraviolet light than TiO₂ in the ultraviolet light region and showed red shift. The results indicated that the prepared photocatalyst can greatly promote the photocatalytic activity. The 2.0% TiO₂/Bi₁₂TiO₂0 system exhibited the highest photocatalytic activity.

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Theoretical study on conformational conversion of 1,3-dioxane inside a capsular host

Ju Wang, Zuo Yin Yang, Xiu Li Wang, Jing Chang Zhang, Wei Liang Cao

中国化学快报. 2007, 18(02): 244-246. https://doi.org/10.1016/j.cclet.2006.12.039

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The conformational conversion of 1,3-dioxane guest encapsulated inside a cylindrical capsular host was investigated with PM3method and single point energies were evaluated by B3LYP method. When entrapped in the capsule, the guest tumbles were slower than that in the free condition. The influences of the inner phase of the capsule on the guest conformational conversion were discussed in detail.

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2007年, 第18卷, 第02期　刊出日期：2007-02-20

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2007年, 第18卷, 第02期 刊出日期：2007-02-20

2007年, 第18卷, 第02期　刊出日期：2007-02-20