2007年, 第18卷, 第10期　刊出日期：2007-10-20

  

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  A facile one-pot synthesis of new thieno[2,3-d]pyrimidine-2,4(1H,3H)-dione derivatives

  A. Davoodnia, H. Behmadi, A. Zare Bidaki, M. Bakavoli, N. Tavakoli Hoseini

  中国化学快报. 2007, 18(10): 1163-1165. https://doi.org/10.1016/j.cclet.2007.07.024

  摘要 ( ) 可视化 收藏

  A facile one-pot synthesis of new 3-arylthieno[2, 3-d]pyrimidine-2, 4(1H, 3H)-diones via base-catalyzed cyclocondensation of ethyl 2-amino-4, 5-dimethylthiophene-3-carboxylate with aryl isocyanates is described.
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  Synthesis of aromatic-linked polyamine macrocyclic derivatives as HIV-1 entry inhibitors

  Jing Su, Yao Liu, Zhi Bing Zheng, Jun Hai Xiao, Hong Lu, Wu Zhong, Li Li Wang, Shi Bo Jiang, Song Li

  中国化学快报. 2007, 18(10): 1166-1168. https://doi.org/10.1016/j.cclet.2007.08.021

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  A series of novel aromatic-linked polyamine macrocyclic derivatives have been synthesized, Their structures were confirmed by MS and ¹H NMR. These compounds exhibited potent anti-HIV-1 activities.
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  The synthesis and activity in vitro of a series of 8-difluoromethoxy quinolones:Analogues of gemifloxacin

  Jin Jiang, Jiu Yu Liu, Hui Yuan Guo

  中国化学快报. 2007, 18(10): 1169-1172. https://doi.org/10.1016/j.cclet.2007.07.030

  摘要 ( ) 可视化 收藏

  7-[4-(Aminomethyl)-3-(methoxyimino)pyrrolidin-1-yl]-1-cyclopropyl-6-fluoro-8-difluoromethoxy-1, 4-dihydro-4-oxoquino-line-3-carboxylic acid and its analogues have been prepared and evaluated for antibacterial activity in vitro.
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  An efficient and facile procedure for synthesis of octyl polyglucoside

  Ying Wu, Jiu Gao Yu, Xiao Fei Ma, Jian She Zhang

  中国化学快报. 2007, 18(10): 1173-1175. https://doi.org/10.1016/j.cclet.2007.07.023

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  Nonionic surfactant alkyl polyglucoside (APG) was prepared by direct glycosidation of alkyl alcohol with glucose in the presence of sulfate acid-silica gel (H₂SO₄/SiO₂) as solid acidic catalyst. The quantity of catalyst was only of 1 wt%, based on the glucose, and the conversion of glucose was close to 100% at 110℃ in 1.5 h. The product was characterized by FT-IR, mass and ¹H NMR spectra. The degree of polymerization (DP) of the glucose in the product was 1.37, and critical micelle concentration (CMC)of product was only 0.0104 wt%.
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  Synthesis of new tetrazene (N-N=N-N)-linked bi (1,2,4-triazole)

  Sheng Hua Li, Si Ping Pang, Xiao Tong Li, Yong Zhong Yu, Xin Qi Zhao

  中国化学快报. 2007, 18(10): 1176-1177. https://doi.org/10.1016/j.cclet.2007.08.018

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  The reaction of 4-amino-1, 2, 4-triazole with sodium dichloroisocyanurate (SDCI) afforded new tetrazene(N-N=N-N)-linked bi(1, 2, 4-triazole) 2a in excellent yield. Increasing the molar ratio of SDCI to 4-amino-1, 2, 4-triazole, the chlorinated product 1, 5, 5'-trichloro-4, 4'-azo-1, 2, 4-triazole (2b) was formed. These new compounds have been characterized by MS, ¹H NMR, ¹³C NMR, and elemental analysis.
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  Polyphosphorous acid catalyzed cyclization in the synthesis of cryptolepine derivatives

  Sheng Biao Wan, Zhe Lin Liu, Di Chen, Qing Ping Dou, Tao Jiang

  中国化学快报. 2007, 18(10): 1178-1181. https://doi.org/10.1016/j.cclet.2007.08.014

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  11-Oxo-10, 11-dihydroxy-5H-indolo[3, 2, b]quinoline 7-carboxylic acid was obtained specifically by polyphosphorous acid catalyzed cyclization with optimal reaction conditions. Biological assays showed that it potentially inhibits the proteasomal chymotrypsin-like activity in vitro and suppresses breast cancer cell growth.
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  Non-surfactant synthesis of mesoporous silica with dye as template

  Peng Feng, Yao Xu, Dong Wu

  中国化学快报. 2007, 18(10): 1182-1186. https://doi.org/10.1016/j.cclet.2007.08.015

  摘要 ( ) 可视化 收藏

  A novel non-surfactant method was described to synthesize mesoporous silica using dye basic fuchsin as template. Chemical reactions were introduced into the formation of mesopores rather than the weak electrostatic or hydrogen-bonding interactions in the traditional surfactant routes. The reactant composition was found to be crucial to the pore structure of objective product. The formation mechanism of mesopore was also proved.
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  Cationic ring-opening polymerization of 3,3-bis (chloromethyl) oxacyclobutane in ionic liquids

  Yuan Yuan Wang, Wei Li, Li Yi Dai

  中国化学快报. 2007, 18(10): 1187-1190. https://doi.org/10.1016/j.cclet.2007.08.013

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  Cationic ring-opening polymerization of 3, 3-bis(chloromethyl)oxacyclobutane catalyzed by BF₃·OEt₂ was carried out in ionic liquids[bmim]BF₄ and[bmim]PF₆. The influences of BCMO concentration and molar ratio of BCMO/BF₃·OEt₂ on the molecular weights and yield of PBCMO were investigated. The polymerization in ionic liquids proceed to high conversions, although molecular weights are limited, similar to polymerization in organic solvent such as CH₂Cl₂. Follow a viewpoint of green chemistry, we feel ionic liquid[bmim]BF₄ is superior to[bmim]PF₆. Extracting[bmim]PF₆ from the product using organic solvent as extractant limits its advantage as a green reaction media.
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  Design,synthesis and antiproliferative activities of novel 5H-pyridazino[4,5-b]indoles

  Rong Dong Li, Xin Zhai, Yan Fang Zhao, Ping Gong

  中国化学快报. 2007, 18(10): 1191-1194. https://doi.org/10.1016/j.cclet.2007.07.027

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  A novel series of 5H-pyridazino[4, 5-b]indoles were designed and synthesized in order to find novel potent anticancer compounds. The structures were confirmed by ¹H NMR and MS. Their antiproliferative activities against two cancer cell lines were tested by the MTT method in vitro. Three of compounds (1e, 1g, and 1h) exhibited potent antiproliferative activities, especially compound 1h (with IC₅₀ values of 5.2 μmol/L and 1.9 μmol/L against Bel-7402 and HT-1080, respectively). The preliminary structure-activity relationships of 5H-pyridazino[4, 5-b]indole derivatives were discussed.
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  Synthesis and antitumor activity of derivatives of 23-hydroxybetulinic acid

  Jin Pei Zhou, Dan Li, Xiao Ming Wu, Wen Cai Ye, Lu Yong Zhang

  中国化学快报. 2007, 18(10): 1195-1198. https://doi.org/10.1016/j.cclet.2007.07.017

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  A series of natural product 23-hydroxybetulinic acid derivatives were prepared. In the preparation of mono-O-benzoyl ester derivative, it was observed that benzoyl group migrated from 3-O-to 23-O-position during the detritylation.
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  Cu-catalyzed cross-couplings under ligandless conditions

  Chuan Zhou Tao, Juan Li, Xin Cui, Yao Fu, Qing Xiang Guo

  中国化学快报. 2007, 18(10): 1199-1202. https://doi.org/10.1016/j.cclet.2007.07.016

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  The possibility to carry out Cu-catalyzed cross-couplings under ligandless conditions was studied. It was found that by using K₃PO₄ as the base, the cross-coupling could proceed successfully between aryl iodides and several types of nucleophiles. Aryl bromides were completely inactive under the same reaction conditions.
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  Synthesis and characterization of novel polyimides based on thiazole-containing diamine

  Xin Zhao, Yan Feng Li, Shu Jiang Zhang, Xiao Long Wang, Yu Shao

  中国化学快报. 2007, 18(10): 1203-1204. https://doi.org/10.1016/j.cclet.2007.08.007

  摘要 ( ) 可视化 收藏

  A new kind of aromatic diamine monomer containing thiazole unit, 2-amino-5-(4-aminophenyl)-thiazole (AAPT), was synthesized in three steps, starting from 4-nitroacetophenone. A novel thiazole-containing polyimide was prepared via the polycondensation of AAPT with 6FDA by one-step method. The resulting polyimide exhibits excellent solubility, film-forming capability and high thermal resistance.
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  Synthesis and application of an IL-supported diol as protecting group for aldehydes

  Yue Qin Cai, Ye Liu, Guo Hua Gao

  中国化学快报. 2007, 18(10): 1205-1208. https://doi.org/10.1016/j.cclet.2007.07.012

  摘要 ( ) 可视化 收藏

  A new IL-supported diol, 1-(2, 3-dihydroxypropyl)-3-methylimidazolium hexafluorophosphate has been synthesized and characterized by FT-IR, ¹H NMR, ¹³C NMR and MS (ESI). Its physical properties such as freezing point, solubility and specific gravity and thermal stability were determined. Synthetic utilities of the resultant diol as a protecting group for aldehydes were also investigated.
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  A novel highly selective fluorescent chemosensor for Hg (Ⅱ) in fully aqueous media

  Xiang Ming Meng, Man Zhou Zhu, Qing Xiang Guo

  中国化学快报. 2007, 18(10): 1209-1212. https://doi.org/10.1016/j.cclet.2007.08.003

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  A novel fluorescent Hg²⁺ chemosensor based on dithia-dioxa-monoaza crown ether was synthesized in four steps from inexpensive starting materials. This new sensor exhibited very strong fluorescence response to Hg²⁺ (F_Hg²⁺/F_free >130) and it was highly selective to Hg²⁺ over the other metal ions by more than 45-fold.
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  Zirconyl chloride promoted highly efficient solid phase synthesis of amide derivatives

  Cherkupally Sanjeeva Reddy, Adki Nagaraj, Pochampally Jalapathi

  中国化学快报. 2007, 18(10): 1213-1217. https://doi.org/10.1016/j.cclet.2007.08.011

  摘要 ( ) 可视化 收藏

  An efficient solid phase route for the synthesis of amide derivatives by the reaction of carboxylic acids with urea in the presence of catalytic amount of zirconyl chloride under microwave irradiation conditions was described. In this way, a range of interesting amide derivatives was obtained in good to excellent yields. The catalyst was recycled with fresh reactants and it gave almost similar results without significant loss of activity up to the third run.
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  Two new glycosides from the genus of Cassia

  Zhu Ju Wang, Qiu Ping Wu, Li Ying Tang, Mei Hong Fu, Yan He, Qian Feng Gong, Lu Qi Huang

  中国化学快报. 2007, 18(10): 1218-1220. https://doi.org/10.1016/j.cclet.2007.08.004

  摘要 ( ) 可视化 收藏

  Two new glycosides were isolated and characterized by spectral analysis from the seeds of Cassia obtusifolia and the leaves of Cassia angustifolia. The structure was elucidated as 1-hydroxyl-2-acetyl-3, 8-dimethoxynaphthalene-6-O-β-D-apiofuranosyl-(1→2)-β-D-glucopyranoside and 2-acetyl-3-methyl-8-methoxyl-1, 4-naphthoquinone-6-O-β-D-glucopyranoside.
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  A new iridoid glycoside from Gardenia jasminoides

  Xiao Qin Zhou, Zhi Ming Bi, Ping Li, Dan Tang, Hai Xia Cai

  中国化学快报. 2007, 18(10): 1221-1223. https://doi.org/10.1016/j.cclet.2007.08.019

  摘要 ( ) 可视化 收藏

  A new iridoid glycoside, 6'-O-sinapoylgeniposide, was isolated from Gardenia jasminoides Ellis and its structure was elucidated on the basis of 1D and 2D NMR, HR-ESI-MS techniques.
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  A new sesquilignan from Selaginella sinensis (Desv.) Spring

  Yan Zhi Wang, Hui Chen, Xiao Ke Zheng, Wei Sheng Feng

  中国化学快报. 2007, 18(10): 1224-1226. https://doi.org/10.1016/j.cclet.2007.08.016

  摘要 ( ) 可视化 收藏

  A new sesquilignan, namely sinensiol A, was isolated from the plant of Selaginella sinensis (Desv.) Spring. Its structure was identified on the basis of various spectroscopic data analysis.
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  A new isochroman-4-one derivative from the peel of Musa sapientum L.and its total synthesis

  Hai Qian, Wen Long Huang, Xiao Ming Wu, Hui Bin Zhang, Jin Pei Zhou, Wen Cai Ye

  中国化学快报. 2007, 18(10): 1227-1230. https://doi.org/10.1016/j.cclet.2007.07.020

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  A new isochroman-4-one, 7, 8-dihydroxy-3-methylisochroman-4-one was isolated from water soluble fraction of Musa sapientum L. Its structure was determined by spectroscopic evidences and its total synthesis has also been reported. The compound showed potent antihypertensive activity.
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  Two new C-glycosylflavones from Mimosa pudica

  Ke Yuan, Jie Li Lu, An Jia, Jian Xin Zhu

  中国化学快报. 2007, 18(10): 1231-1234. https://doi.org/10.1016/j.cclet.2007.08.008

  摘要 ( ) 可视化 收藏

  Two new C-glycosylflavones were isolated from the whole plant of Mimosa pudica, and their structures were determined as 6, 7, 3', 4'-tetrahydroxyl-8-C-[α-L-rhamnopyranosyl-(1→2)]-β-D-glucopyranosyl flavone (1), 5, 7, 3', 4'-tetrahydroxy-8-C[β-D-apiose-(1→4)]-β-D-glycopyranosyl flavone (2). Their structures elucidated by chemical and spectroscopic analysis including IR, MS, 1D and 2D NMR spectra.
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  Three new C₂₁ steroidal glycosides from the roots of Cynanchum inamoenum

  Li Qin Wang, Jian Hua Wang, Yue Mao Shen, Jun Zhou

  中国化学快报. 2007, 18(10): 1235-1238. https://doi.org/10.1016/j.cclet.2007.07.026

  摘要 ( ) 可视化 收藏

  Three new C₂₁ steroidal glycosides named inamoside E (1), inamoside F (2) and inamoside G (3) were isolated from the roots of Cynanchum inamoenum (Maxim.) Loes. Their structures were determined by spectroscopic analysis, especially by 1D and 2D NMR experiments.
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  Furostanol saponins with inhibitory action against COX-2 production from Tupistra chinensis rhizomes

  Kun Zou, Jun Zhi Wang, Jun Wu, Yuan Zhou, Chuang Liu, Fei Jun Dan, Ya Xiong Zhang, Jin Yang

  中国化学快报. 2007, 18(10): 1239-1242. https://doi.org/10.1016/j.cclet.2007.06.018

  摘要 ( ) 可视化 收藏

  Two furostanol saponins were obtained from the n-butanol fraction of methanol extract from Tupistra chinensis rhizomes, a folk medicine of Shennongjia Forest District of Hubei Province. Their structures were determined as (25S)-26-O-(β-D-glucopyranosyl)-furost-1β, 3β, 22α, 26-tetrol-3-O-β-D-glucopyranosyl-(1→4)-β-D-glucopyranosyl-(1→2)-β-D-glucopyranoside (1) and (25R)-26-O-(β-D-glucopyranosyl)-furost-lβ, 3β 22α, 26-tetrol 3-O-β-D-glucopyranosyl-(1→4)-β-D-glucopyranosyl-(1→2)-β-D-glucopyranoside (2), on basis of chemical and spectroscopic evidences. 1 and 2 displayed marked inhibitory action towards COX-2 production in macrophages of the rat abdomen induced by LPS at 20 μg/mL.
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  Three new diarylheptanoids and their antioxidant property

  Chang Xin Zhou, Xiang Yi Zhang, Xiao Wu Dong, Qiao Feng Tao, Hui Dou, Rong Ping Zhang, Ke Xin Huang, Xiao Kun Li, Chang Xiang Chen, Su Zeng, Yu Zhao

  中国化学快报. 2007, 18(10): 1243-1246. https://doi.org/10.1016/j.cclet.2007.08.001

  摘要 ( ) 可视化 收藏

  Three new diarylheptanoids, i. e., sodium(5S, 2E)-1, 7-bis(4-hydroxyphenyl)-1-hydroxy-2-hepten-5-sulfonate (1), sodium(5S, 2E)-1, 7-bis(4-hydroxyphenyl)-1-hydroxy-2-hepten-5-sulfonate (2) and 3, 5-diacetoxy-1-(3-methoxy-4, 5-dihydroxyphenyl)-7-(4-hydroxy-3-methoxyphenyl)heptane (3) were isolated from the rhizomes of Zingiber officinale. The structures of the new compounds were elucidated on the basis of spectroscopic methods. The antioxidant activities of 3 were assayed by in vitro models involving DPPH free radicals and superoxide anion radicals.
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  Two new compounds from Zingiber officinale

  Yu Zhao, Qiao Feng Tao, Rong Ping Zhang, Chang Xin Zhou, Hui Dou, Shu Yun Shi, Ye Cheng Xiao, Lian Li Sun, Su Zeng, Ke Xin Huang, Xiao Dong Zhang, Xiao Kun Li

  中国化学快报. 2007, 18(10): 1247-1249. https://doi.org/10.1016/j.cclet.2007.08.002

  摘要 ( ) 可视化 收藏

  A new cyclic diarylheptanoid, 1, 5-epoxy-3-hydroxy-1-(3-methoxy-4, 5-dihydroxyphenyl)-7-(4-hydroxyphenyl)-heptane (1), as well as a new monoterpene, 10-O-β-D-glucopyranosyl-hydroxy cineole (2) were isolated from the rhizomes of Zingiber officinale. The structures of compounds 1 and 2 were established based on their spectral data. In addition, the antioxidant activities of these compounds were also measured.
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  Preparation of new hybrid organic/inorganic polymeric chiral stationary phases for ligand-exchange chromatography

  Rui Juan Song, Yu Fu, Na Yao, Yuan De Long, Tian Bao Huang

  中国化学快报. 2007, 18(10): 1250-1252. https://doi.org/10.1016/j.cclet.2007.07.022

  摘要 ( ) 可视化 收藏

  Three new hybrid organic/inorganic polymeric ligand-exchange chiral stationary phases were developed by radical chain transfer reaction and surface grafting on silica gel, and successfully used for the enantioseparations of DL-amino acids and DL-hydroxyl acids. The resolutions were achieved by using water containing 2.0×10^-4 mol/L of CuAc₂ as a mobile phase, column temperature of 40℃, flow rate of 1.0 mL/min and detection at UV 254 mn. The elution order of D-isomer before L-isomer was observed for all DL-amino acids resolved except DL-Pro.
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  Spectrometric study of α-methylene aromatic araminenone and aminoketone

  Li Yuan Mou, Zi Yun Lin, Li Ya Zhu, Xiao Tian Liang

  中国化学快报. 2007, 18(10): 1253-1255. https://doi.org/10.1016/j.cclet.2007.07.019

  摘要 ( ) 可视化 收藏

  Thirteen α-methylene aromatic araminenone and four α-methylene aromatic aminoketones were prepared by modified Mannich reaction. On the basis of isotopic labeling, a plausible way of cleavage was proposed for the formation of the M⁺-17 fragment peak in the MS of the α-methylene aromatic araminenone and aminoketones. The characteristic chemical shift of the olefinic protons in ¹H NMR is also discussed.
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  Pure LiFePO₄ with high energy density prepared by water quenching treatment

  Xu Guang Gao, Guo Rong Hu, Zhong Dong Peng, Ke Du, Xin Rong Deng

  中国化学快报. 2007, 18(10): 1256-1260. https://doi.org/10.1016/j.cclet.2007.08.017

  摘要 ( ) 可视化 收藏

  A compound "vacuum firing and water quenching" technique was presented in the synthesis of LiFePO₄ cathode powder. The sample was prepared by heating the pre-decomposed precursor mixtures sealed in vacuum quartz-tube, followed by water quenching at the sintering temperature. The results indicate that using the "fast quenching" treatment can succeed in controlling overgrowth of the grain size of final product and improving its utilization ratio of active material. The sample synthesized by this technique has the high reversible discharge specific capacity and good cyclic electrochemical performance.
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  A novel Fe (OH)₃/TiO₂ nanoparticles and its high photocatalytic activity

  Nan Wang, Li Hua Zhu, Jing Li, He Qing Tang

  中国化学快报. 2007, 18(10): 1261-1264. https://doi.org/10.1016/j.cclet.2007.08.020

  摘要 ( ) 可视化 收藏

  A very simple and controllable approach was proposed to synthesize novel Fe(OH)₃/TiO₂ nanoparticles. Compared with neat TiO₂, the Fe(OH)₃/TiO₂ increased the rate of the photocatalytic degradation of methyl orange at pH 6.0 by more than five times, showing photocatalytic activity as excellent as P25. This enhancing effect is mainly attributed to the ferric hydroxide deposits as the electron scavenger and the enriched surface hydroxyl groups.
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  Effect of surfactant structure on catalysis of microemulsion for photoisomerization of trans-stilbene

  Xia Guo, Ling Lin, Rong Guo

  中国化学快报. 2007, 18(10): 1265-1268. https://doi.org/10.1016/j.cclet.2007.07.018

  摘要 ( ) 可视化 收藏

  In this study, the photoisomerization of trans-stilbene was carried out in water in oil (W/O) microemulsions by using sodium dodecyl sulfate (SDS), dodecyl trimethyl ammonium bromide (DTAB) and cetyl trimethyl ammonium bromide (CTAB) as surfactant, respectively. The catalytic effect of microemulsion on this reaction is closely related to the structure of surfactanz. When there is no photosensitizer 9, 10-dicyanoanthracene (DCA), the surfactant with shorter hydrophobic chain is preferred, while in the presence of DCA, the surfactant with anionic polar group is preferred.
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  Synthesis and characterization of quaternized poly (phthalazinone ether sulfone ketone) for anion-exchange membrane

  Xi Gao Jian, Chun Yan, Hua Min Zhang, Shou Hai Zhang, Cheng Liu, Ping Zhao

  中国化学快报. 2007, 18(10): 1269-1272. https://doi.org/10.1016/j.cclet.2007.08.022

  摘要 ( ) 可视化 收藏

  Chloromethylated poly(phthalazinone ether sulfone ketone) (CMPPESK) was prepared from poly(phthalazinone ether sulfone ketone) (PPESK) using chloromethyl octyl ethers (CMOE) with lower toxicity as chloromethylated regent. CMPPESK was soluble in N-methyl-2-pyrrolidone (NMP), N, N-dimethylacetamide (DMAc) and chloroform. Quatemized poly(phthalazinone ether sulfone ketone) (QAPPESK) was prepared from CMPPESK by quaternization. QAPPESK had excellent solvent resistance, which was only partly soluble in sulfuric acid (98%) and swollen in N, N-dimethylformamide (DMF). The vanadium redox flow battery (V-RFB) using QAPPESK anion-exchange membrane had better performance with 88.3% of overall energy efficiency.
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  TiO₂/polyaniline composites:An efficient photocatalyst for the degradation of methylene blue under natural light

  Fang Wang, Shi Xiong Min

  中国化学快报. 2007, 18(10): 1273-1277. https://doi.org/10.1016/j.cclet.2007.08.010

  摘要 ( ) 可视化 收藏

  Polyaniline (PAn) sensitized nanocrystalline TiO₂ composites (TiO₂/PAn) were successfully prepared and used as an efficient photocatalyst for the degradation of dye methylene blue (MB). The results showed that PAn was able to sensitize TiO₂ efficiently and the composite photocatalyst could be activated by absorbing both the ultraviolet and visible light (λ:190~800 nm), whereas pure TiO₂ absorbed ultraviolet light only (λ<380 nm). Under the irradiation of natural light, MB could be degraded more efficiently on the TiO₂/PAn composites than on the TiO₂. Furthermore, it could be easily separated from the solution by simple sedimentation.
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  The complexes of multiimidazole with copper (Ⅰ) display tyrosinase activity

  Rong Xiao, Xiao Yu Su, Ru Gang Xie

  中国化学快报. 2007, 18(10): 1278-1280. https://doi.org/10.1016/j.cclet.2007.07.013

  摘要 ( ) 可视化 收藏

  The six multiimidazole copper(Ⅰ) complexes are utilized to mimic tyrosinase. The main product is 3, 5-di-t-butylcatechol from o-hydroxylation of the substrate 2, 4-di-t-butylphenol. The highest yield of catechol is up to 82.2% and selectivity 94.8% by[Cu(Ⅰ)₂(3b)(MeCN)₂](ClO₄)₂ and O₂ under mild conditions, which are found to be more efficient than that already reported.
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  Methylation of 2-methylnaphthalene with methanol to 2,6-dimethylnaphthalene over HZSM-5 modified by NH₄F and SrO

  Chen Zhang, Xin Wen Guo, Ya Nan Wang, Xiang Sheng Wang, Chun Shan Song

  中国化学快报. 2007, 18(10): 1281-1284. https://doi.org/10.1016/j.cclet.2007.07.025

  摘要 ( ) 可视化 收藏

  The methylation of 2-methylnaphthalene (2-MN) into 2, 6-dimethylnaphthalene (2, 6-DMN) was investigated over the solid acid catalysts. The results show that HZSM-5 modified by NH₄F has better catalytic performance than parent HZSM-5 due to the decrease in the acidity. When NH₄F/HZSM-5 is further modified by SrO, its catalytic activity decreases due to the decrease in the total acid amount and acidic strength. As a result, the comprehensive modification of NH₄F and SrO leads to the increase in the 2, 6-DMN selectivity (2, 6-DMN to DMN), up to 64.8% when 2-MN conversion is 10%. We calculated the ESP charge by density functional theory and the results show that the 6-position in 2-MN has higher ESP charge value than 7-position. The formation of 2, 6-DMN is favored energetically as compared to that for 2, 7-DMN. This suggests during the alkylation of 2-MN inside the ZSM-5 channel, the formation of 2, 6-DMN is favored electronically than that of 2, 7-DMN. Hence, lowering the acidity of catalyst is a key factor to obtain high selectivity of 2, 6-DMN.
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  Preparation of nanometer FeCuP alloy and its application in decomposition of PH₃

  Chang Xiu Han, Ji Li Ren, Xue Jiao Tang, Bao Gui Zhang

  中国化学快报. 2007, 18(10): 1285-1288. https://doi.org/10.1016/j.cclet.2007.08.005

  摘要 ( ) 可视化 收藏

  A new ternary Fe-based alloy catalyst FeCuP applied to decompose PH₃ was prepared with low-cost material by chemical reduction deposition method. The properties of it were characterized by XRD, ICP and SEM. Its catalytic activity on the decomposition of PH₃ and the decomposition conditions were studied. FeCuP alloy exhibits high thermal stabilities and high catalytic activity. Using it as catalyst, the decomposition temperature of phosphine decreases from over 800℃ to 400-500℃. The decomposition rate of phosphine achieved 100%.
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  The preparation and fluorescence properties of europium nanoparticles

  Xi Bao Gao, Jiang Yu, Ning Li, Hong Yin Yin, Jing He Yang

  中国化学快报. 2007, 18(10): 1289-1292. https://doi.org/10.1016/j.cclet.2007.07.010

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  A new structured metallic nanomaterial of europium nanoparticle was prepared using tannic acid as the reductive agent, and nanoeuropium protein conjugates were synthesized by the method of lipoic acid modification on the surface of nanoparticle, which opens a new field of application of lanthanides in nanotechniques. Their properties were also characterized by UV-vis absorption spectroscopy, transmission electron microscopy (TEM), and fluorescence spectroscopy. The europium nanoparticle and its protein conjugates solution were stable and water-soluble. The fluorescence intensity of the composite europium nanoparticles was significantly increased in the presence of trace protein, and was linear proportional to the concentration of proteins under optimum conditions. According to this, a fluorimetric method for the determination of protein was developed in this paper.
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  Critical bubble radius in solvent sublation

  Peng Yu Bi, Hui Ru Dong, Nan Nan Wang

  中国化学快报. 2007, 18(10): 1293-1296. https://doi.org/10.1016/j.cclet.2007.08.009

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  The complex compound of dithizone-Co(Ⅱ) was separated and concentrated from the aqueous phase to n-octanol by solvent sublation. From the analysis of the coalescence behavior of bubbles on water-organic interface, the conception of critical bubble radius was proposed, and the value of the critical bubble radius in the water-octanol system was obtained:1.196×10^-3 m. The simulation of the mathematical model using CBR and experimental data is completed with perfect results, and the simulation of the mathematical model using CBR is very different with the classic one. The analytical results proved that the critical bubble radius should be adequately considered in mathematical model of solvent sublation.
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  A preliminary study of isopropyl alcohol matrix effect and correction in ICP-MS

  Zhao Chu Hu, Shan Gao, Sheng Hong Hu, Yong Sheng Liu, Hai Hong Chen

  中国化学快报. 2007, 18(10): 1297-1300. https://doi.org/10.1016/j.cclet.2007.08.012

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  Isopropyl alcohol matrix effect was found to be element specific by using the defined matrix effect factor in ICP-MS, which could not be corrected by using the conventional internal reference method. Unlike the conventional internal reference method, the presented method allows for the analyte to behave differently from the internal reference under the influence of the matrix.
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  A combined electrochemical and DFT study of the lattice strain effect on the surface reactivity of Pd

  You Gui Chen, Lin Zhuang, Jun Tao Lu

  中国化学快报. 2007, 18(10): 1301-1304. https://doi.org/10.1016/j.cclet.2007.08.006

  摘要 ( ) 可视化 收藏

  We report a combined study of electrochemical experiments and ab initio calculations on tuning the surface reactivity of Pd via a compressive lattice strain achieved by employing nanoparticles of Pd-Cu alloys with a Pd-rich surface. Surface oxygen-containing species were used as the probing molecule for revealing the surface reactivity. Both density functional theory (DFT) calculations and experiments showed linear relationships, with very close slopes, between the adsorption strength of OH_ads and the Pd lattice constant. Not only is this work a successful realization of controllable modulation in the surface reactivity, but it also provides valuable information for the rational design of Pd-based catalysts for fuel cell applications.