中国化学快报

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A new approach to the synthesis of N-monosubstituted aniline and its derivatives via β-cyclodextrin host-guest complexes

Min Zhang, Yong Gao, Rong Zu Hu, Zhen Shi

中国化学快报. 2008, 19(10): 1139-1142. https://doi.org/10.1016/j.cclet.2008.07.009

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A novel method for the synthesis of N-monosubstituted aniline and its derivatives via β-cyclodextrin(CD)host-guest complexes has been presented.The mild reaction gives the title compounds with high selectivity in good yields of 90-98%.

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An expeditious and one-pot synthesis of unsymmetrical 2,5-disubstituted-1,3,4-oxadiazoles under microwave irradiation and solvent-free conditions

Nasser Montazeri, Kurosh Rad-Moghadam

中国化学快报. 2008, 19(10): 1143-1146. https://doi.org/10.1016/j.cclet.2008.06.050

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A one-pot synthesis of some unsymmetrical 2,5-disubstituted-1,3,4-oxadiazoles via cyclocondensation of benzoylhydrazines with orthoesters under solvent-free and microwave conditions are described here.The reaction is efficiently catalyzed by silicasupported sulfuric acid as it provided the title compounds in high yields and relatively short times.The catalyst is reusable and can be applied several times without considerable decrease in the yields and rates of the reactions.

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Synthesis and characterization of a novel high thermally stable energy compound: 1-(1-Adamantylamino)-2,4,6-trinitrobenzene

Sheng Jun Luo, Wan Long Pan, Ying Nan Chi, Yan Qing Xu, Kun Lin Huang, Chang Wen Hu

中国化学快报. 2008, 19(10): 1147-1150. https://doi.org/10.1016/j.cclet.2008.06.030

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1-(1-Adamantylamino)-2,4,6-trinitrobenzene (1) as a potential energy material has been synthesized in excellent yield and characterized by FT-IR,¹H NMR and single crystallographic methods,and is thermally stable,decomposed in the range of 215-72℃.

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Silica supported sodium hydrogen sulfate(NaHSO₄/SiO₂): A mild and efficient reusable catalyst for the synthesis of aryl-14-H-dibenzo[a,j]xanthenes under solvent-free conditions

Shallnaz Rostamizadeh, Nasrin Shadjou, Ali Mohammad Amani, Saeed Balalaie

中国化学快报. 2008, 19(10): 1151-1155. https://doi.org/10.1016/j.cclet.2008.07.026

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A simple and efficient procedure for the preparation of aryl-14-H-dibenzo[a,j]xanthenes by a one-pot condensation reaction of 2-naphthol and aryl aldehydes,in the presence of silica supported sodium hydrogen sulfate(NaHSO₄/SiO₂)as a catalyst and in the absence of solvent has been developed.The present method offers several advantages such as excellent yields,short reaction time (10-30 min),mild condition,simple work-up,and the Use of a cheap and environmentally friendly catalyst with remarkable reusability.

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Direct electrocatalvtic reduction of p-nitrophenol at room temperature ionic 1iquid modified electrode

Wei Sun, Mao Xia Yang, Qiang Jiang, Kui Jiao

中国化学快报. 2008, 19(10): 1156-1158. https://doi.org/10.1016/j.cclet.2008.07.011

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Direct electrochemical reduction of p-nitrophenol(PNP)was investigated on a room temperature ionic liquid N-butylpyridinium hexafluorophosphate(BPPF₆)modified carbon paste electrode(CILE).The cathodic peak potential was positively shifted and the peak currents were increased compared to that obtained on traditional carbon paste electrode(CPE).The results indicated that the presence of ionic liquid BPPF₆ on the electrode surface showed excellent catalytic ability to the electrochemical reduction of PNP.The electrochemical behaviors of PNP on the CILE were investigated by cyclic voltammetry and the conditions such as the scan rate,the buffer pH,the substrate concentration were optimized.The electrochemical parameters were further calculated with the results of the electron transfer number(n),the charge-transfer coefficient(α) and the surface concentration(Γ_Υ)as 1.76,0.37 and 2.47×10^-9 mol/cm²,respectively,for the selected reducfive peak.The results indicated that PNP showed all irreversible adsorption-controlled electrode process on the CILE.

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Synthesis of novel fullerene α-amino acid conjugates

Jing Zhang, Yan Xia Wang, Feng Kang, Ying Ya Shao, Zong Jie Li, Xin Lin Yang

中国化学快报. 2008, 19(10): 1159-1162. https://doi.org/10.1016/j.cclet.2008.06.035

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Aspartie acid and glutamic acid with protected α-amino and α-carboxyl groups had been used to react with the activated hydroxyl group of N-substituted 3,4-fuUero pyrrolidine.The products were deprotected,affording two monofullerene α-amino acids,monofullerene aspartic acid(mFas) and monofullerene glutamic acid(mFgu).Then a bifullerene glutamic acid conjugate (bFguC)was synthesized by reaction of mFgu containing protected amino group with N-subsfimted 3,4-fullero pyrrolidine.

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Synthesis and neuroprotective properties of novel cinnamide dertvatives

Bin Wu, Li Zhou, Hui Hui Cai

中国化学快报. 2008, 19(10): 1163-1166. https://doi.org/10.1016/j.cclet.2008.06.052

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A new series of compounds (E)-1-(4-(bis-arylmethyl)piperazin-l-y1)-3-arylprop-2-en-1-one(1a-r),have been synthesized and their structures were confirmed by ESI-MS and ¹H NMR.The preliminary pharmacological screening showed that some of these compounds had similar neuroprotective effects with Edaravone.

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Practical reduction of imines by NaB H₄/alumina under solvent-free conditions: An efficient route to secondary amine

Foad Kazemi, Ali Reza Kiasat, Ebrahim Sarvestani

中国化学快报. 2008, 19(10): 1167-1170. https://doi.org/10.1016/j.cclet.2008.06.043

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Sodium borohydride supported on alumina reduces imines to the corresponding secondary amines in high to excellent isolated yields under solvent-free conditions.Noteworthy is that highly chemoselective reactions were achieved in the presence of other functional groups such as halogen,nitro,and cyano groups.

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Silica supported perchloric acid(HClO₄-SiO₂): A mild,reusable and highly efficient heterogeneous catalyst for the synthesis of axidoalkyl naphthols

Gholam Hossein Mahdavinia, Mohammad A.Bigdeli, Majid M.Heravi

中国化学快报. 2008, 19(10): 1171-1174. https://doi.org/10.1016/j.cclet.2008.06.048

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An efficient and direct procedure has been developed for the preparation of amidoalkyl naphthols by a one-pot condensation of aryl aldehydes,2-naphthol and urea or amides,in the presence of HClO₄-SiO₂ as a heterogeneous catalyst.The reactions were carried out under reflux and solvent-free conditions.The present methodology offers several advantages such as excellent yields,simple procedure,easy work-up and ecofriendly reaction condition.The catalystis easily prepared,stable,reusable and efficient under the reaction conditions.

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A novel ligand-free palladium catalytic system with SO₃H-functional ionic liquids as cocatalyst for amidocarbonylation reaction

Qing Lu Zhao, Lai Lai Wang

中国化学快报. 2008, 19(10): 1175-1178. https://doi.org/10.1016/j.cclet.2008.07.005

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Effects of Lewis acid BF₃·OEt₂,and Brønsted acids TsOH,CF₃COOH,H₃PO₄,and HClO₄ as cocatalyst respectively on the ligand-free palladium-catalyzed amidocarbonylation were investigated.SO₃H-functional ionic liquids 1-methyl-3-(4-sulfonic acid)butylimidazolium hydrosulfate[MIm(CH₂)₄SO₃H][HSO₄]and 1-methyl-3-(4-sulfonic acid)butyrlimidazolium triflate [MIm(CH₂)₄SO₃H][OTf]were firstly employed as cocatalysts instead of these Lewis acid and Brønsted acids.By using a ligand-free and weak corrosive catalyst in situ prepared form PdBr₂,LiBr·H₂O,and[MIm(CH₂)₄SO₃H][OTq,the amidocarbonylation of benzaldehyde,acetamide,and CO could proceed smoothly and afford N-acetyl-α-phenylglycine with yield of 58% in [C₆mim]PF₆ medium.

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Asymmetric bioreduction of substituted acenaphthenequinones using plant enzymatic systems: A novel strategy for the preparation of (+)-and(-)-mono hydroxyacenaphthenones

Lian Peng Tong, Jing Nan Cui, Wei Min Ren, Xing Yong Wang, Xu Hong Qian

中国化学快报. 2008, 19(10): 1179-1182. https://doi.org/10.1016/j.cclet.2008.06.037

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Regio- and enantioselective reduction of substituted acenaphthenequinones were conducted under mild reaction conditions using plant enzymatic systems.A screening of 15 plants allowed the selection of two suitable plants fulfilling enantiocomplementarity.The (+)-and(-)-mono hydroxyacenaphthenones were achieved with high conversion and good enantiomeric purity using peach(Prunus persica(L.)Batseh.,conversion 98%,71% ee)and carrot(Daucus carota L.,conversion 95%,81% ee),respectively.

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Solvent- and catalyst-free synthesis of dihydropyrimidinthiones in one-pot under focused microwave irradiation conditions

Hong Wen Zhan, Jin Xian Wang, Xi Tian Wang

中国化学快报. 2008, 19(10): 1183-1185. https://doi.org/10.1016/j.cclet.2008.06.039

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Fifteen dihydropyrimidinthiones have been synthesized by microwave-assisted Biginelli reactions without any solvent of catalyst.The advantages of this novel protocol include the excellent yield,operational simplicity,short time and the avoidance of the use of organic solvents and catalysts.

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Oxalic acld as a catalyst for efficient synthesis of bis-(indolyl)methanes,and 14-aryl-14H-dibenzo[a,j]xanthenes in water

Nagnnath D.Kokare, Jaiprakash N.Sangshetti, Devanand B.Shinde

中国化学快报. 2008, 19(10): 1186-1189. https://doi.org/10.1016/j.cclet.2008.07.015

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A simple,efficient,and environment benign route was developed for the preparation of bis-(indolyl)methanes and 14-aryl-14H-dibenzo[a,j]xanthenes from condensation of various aromatic aldehydes or ketones with indole,and 2-naphthol,respectively,using oxalic acid catalyst in aqueous medium.Use of cheap and easily available catalyst,better yields and simple reaction protocol are the advantages of the present method.

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Photochemical reaction between magnesium tetraphenyl porphyrin and oxygen

Jian Bin Zhang, Peng Yan Zhang, Guo Hua Chen, Fang Han, Xiong Hui Wei

中国化学快报. 2008, 19(10): 1190-1192. https://doi.org/10.1016/j.cclet.2008.07.004

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The photochemical reaction of magnesium tetraphenyl porphyrin(MgTPP) with O₂ was studied in CH₂Cl₂ by steady-state fluorescence,UV-vis absorption,FTlR and MALDI-TOF MS measurements.These spectra indicate that O₂ can react with Mg TPP excited by irradiation.forming the stable 1:1 coordinated adduct of MgTPP-O₂.In the adduct,the oxygen atoms of O₂ may insert in the Mg-N bonds in MgTPP and birid with the nitrogen atoms of MgTPP to form N-O-Mg bonds.

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Design, synthesis and biological estimation of 1-(benzoxazole-2-y1)piperazine and 4-(benzoxazole-2-yl)piperidine derivatives as potential α₁-AR antagonists

Jia Bin Li, Lin Xia, Bin Wu, Tao Wang, Zhen Zhou Jiang

中国化学快报. 2008, 19(10): 1193-1195. https://doi.org/10.1016/j.cclet.2008.06.042

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Two series of 1-(benzoxazole-2-yl) piperazine(8a-i) and 4-(benzoxazole-2-yl) piperidine compounds(10a-i) were designed,synthesized and evaluated for their α₁-AR antagonistic activities.Biological assay in vitro indicated that 10h showed slightly stronger α₁-AR antagonistic activity to that of our lead compound 1.

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Synthesis and characterization of α-{3-[2-hydroxy-3-(N-methyl-N-hydroxy-ethylamino)propoxy]propyl}-ω-butylpolydimethylsiloxanes

Hai Feng Sun, Qing Si Zhang, Meng Zhang, Yi Tao Yu, Jian Ping Zong

中国化学快报. 2008, 19(10): 1196-1198. https://doi.org/10.1016/j.cclet.2008.06.047

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α-{3-[2-hydroxy-3-(N-methyl-N-hydroxyethylamino)propoxy]propyl}-ω-butylpolydimethylsiloxanes Ⅲ with various moleculax weights were prepared by epoxy addition of α-[3-(2,3-epoxy-propoxy)propyl]-ω-butylpolydimethylsiloxanes Ⅱ and N-methylmonoethanolamine.At each step.the outcome compounds were characterized through FT-IR and NMR spectra,the results showed that each step was successfully carried out and objective products were achieved.

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Synthesis and characterization of novel calix[6]phyrin derivatives

Wei Chen, Tian Jun Liu

中国化学快报. 2008, 19(10): 1199-1201. https://doi.org/10.1016/j.cclet.2008.06.055

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Three novel calix[6]phyrin derivatives have been synthesized by reaction of corresponding tripyrrane with aromatic aldehyde.The reaction condition was optimized and the structures of these compounds have been characterized by NMR and MS.

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Facile synthesis and cytotoxicity of 5-C-alkylates of 20(S) camptothecins

Di Zao Li, Xian Dao Pan, Hong Yan Liu, Song Wu

中国化学快报. 2008, 19(10): 1202-1205. https://doi.org/10.1016/j.cclet.2008.07.022

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A series of 5-C-alkylating camptothecins have been synthesized by one-step method.and their in vitro antitumor activity was evaluated against six human cancer cell lines.The results showed that all 5-C-alkylatcs of camptothecins possessed poor cytotoxicity on six human cancer cell lines.

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Synthesis and antitumor activity of 6-and 2-(1-acylsulfanylalkyl)-5,8-dimethoxy-1,4-naphthoquinones

Li Ming Zhao, Tian Pei Xie, Yu Qin He, De Feng Xu, Shao Shun Li

中国化学快报. 2008, 19(10): 1206-1208. https://doi.org/10.1016/j.cclet.2008.06.046

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Sixteen novel 6-and 2-(1-aeylsulfanylalkyl)-5,8-dimethoxy-1,4-naphthoquinones were designed and synthesized.Their eytotoxicifies were evaluated in vitro against BEL-7402,HT-29 and SPC-Al cell lines.The pharmacological results showed that most of the prepared compounds displayed the excellent selectivity for HT-29 cell line.Compound 16b exhibited the most potent antitumor activity among the tested compounds.

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Synthesis and characterization of a novel hydroxypolyether blocked polydimethylsiloxane PEO-b-PDMS-b-PEO

Wei Hu Li, Xing Yuan Zhang, Jia Bing Dai

中国化学快报. 2008, 19(10): 1209-1211. https://doi.org/10.1016/j.cclet.2008.07.021

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A novel hydroxypolyether blocked polydimethylsiloxane,poly(ethylene oxide) propyl-b-polydimethylsiloxane-b-propyl poly(ethylene oxide)(PEO-b-PDMS-b-PEO)was synthesized by simple hydrosilation reaction of poly(ethylene glycol) monoallyl ether with α,ω-dihydrogen terminated PDMS(HPDMS).Fourier transform infrared spectroscopy(FTIR) and ¹H NMR were used to identify the structure of PEO-b-PDMS-b-PEO and intermediate product HPDMS.Based on the effect investigations of temperature.reactant molar ratio,catalyst and time on the hydrosilation,it Was found that the conversion of Si-H bond to Si-C bond increased with the increase of catalyst and time,and the reaction completed when the content of catalyst Was 22 μg/g and the time Was 5 h,respectively.Urethane reaction of OH and NCO group confirms that PEO-b-PDMS-b-PEO is more reactive toward to diisocyanate than α,ω-dihydroxylbutyl terminated PDMS.

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Two new secolignans from the roots of Urtica mairei Levl.

Wei Wang, Xing Guo Yan, Li Xin Duan, Yuan Zhou, Ling Tang, Yong Qi Wang, Bao Min Feng

中国化学快报. 2008, 19(10): 1212-1214. https://doi.org/10.1016/j.cclet.2008.06.049

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Twonew secolignans(1 and 2)were isolated from the roots of Urtica mairei Levl.The structures of these two compounds were determined on the basis of extensive spectroscopic methods including HR-E1-MS.1D and 2D NMR experiments.

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Two new lignans from Dipteronia dyeriana

Rong Guo, Min Luo, Chun Lin Long, Ma Lin Li, Zhi Qin Ouyang, Yi Ping Zhou, Yue Hu Wang, Xing Yu Li, Ya Na Shi

中国化学快报. 2008, 19(10): 1215-1217. https://doi.org/10.1016/j.cclet.2008.06.051

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A new sesquilignan,7',8'-didehydroherpetotriol(1),and a new lignan glycoside,(+)-isolariciresinol-9'-O-α-L-rhamnopyranosyl-(1→6)-β-D-glucopyranoside(2),were isolated from the branches of Dipteronia dyeriana.Their structures were elucidated by spectroscopic methods and chemical evidence.Compound 1 possessed inhibitory activity against human leukaemia K562 cells with an IC₅₀ value of 39 μmol/L.

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Two new rotenoids from the root of Derris elliptica

Hai Ying Lu, Jing Yu Liang, Ping Yu, Wei Qu, Ling Zhao

中国化学快报. 2008, 19(10): 1218-1220. https://doi.org/10.1016/j.cclet.2008.06.014

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Two new rotenoids 4',5'-dihydroxy-6a,12a-dehydrodeguelin(1),11,4',5'-trihydroxy-6a,12a-dehydrodeguelin(2),along with two known rotenoids rotenone and deguelin were isolated from the root of Derris elliptica collected in Guangdong Province,China.Their structures were established by extensive spectroscopic analysis.

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A new cytotoxic caged polyprenylated xanthone from the resin of Garcinia hanburyi

Li Li Wang, Zhan Lin Li, Yong Peng Xu, Xiao Qiu Liu, Yue Hu Pei, Yong Kui Jing, Hui Ming Hua

中国化学快报. 2008, 19(10): 1221-1223. https://doi.org/10.1016/j.cclet.2008.06.013

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A new caged polyprenylated xanthone,gambogic aldehyde(1),was isolated from the resin of Garcinia hanburyi.Its structure was elucidated on the basis of spectral data including 1D and 2D NMR data.In addition.the antiproliferative ability of compound 1 was determined in mouse leukemia P388 and P388/ADR ceils.

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Two new secoiridoid glycosides from the roots of Picrorhiza scrophulariiflora

Lian Chun Zou, Tong Fei Zhu, Shu Cai Gan, Da Cheng Wang, Yu Zhang, Xu Ming Deng

中国化学快报. 2008, 19(10): 1224-1227. https://doi.org/10.1016/j.cclet.2008.06.044

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From the roots of Picrorhiza scrophulariiflora,two new sccoiridoid glycosides,named picrosecosides I and Ⅱ(1,2)have been isolated.Their structures were elucidated on the basis of chemical and spectropic evidences.

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Two novel nortriterpenes from the roots of Phlomis umbrosa

Pu Liu, Li Ying Li, Rui Qi Niu, Wei Ping Yin, Tian Zeng Zhao

中国化学快报. 2008, 19(10): 1228-1230. https://doi.org/10.1016/j.cclet.2008.06.053

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Two novel 28-noroleanane-derived spirocyclic triterpenoids with unusual skeleton structures,phlomisone(1),phlomistetraol A (2),were isolated from the roots of Phlomis umbrosa.Their structures were elucidated by spectroscopic methods,including 1D,2D nuclear magnetic resonance(NMR),high-resolution mass spectrometry(HR-MS).

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A new lipophilic monosaccharide from Erigeron annuus

Sheng Chao Yang, Jian Xin Pu, Ying Lu, Feng Hui Xiao, Wei Lie Xiao, Han Dong Sun

中国化学快报. 2008, 19(10): 1231-1233. https://doi.org/10.1016/j.cclet.2008.06.038

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A new lipophilic monosaccharide,erigearide A(1),was isolated from the aerial parts of Erigeron annuus(Lima.) Pers.Its structure was elucidated by analysis of spectroscopic evidence.

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A new forsythenside from Forsythia suspensa

Yan Zhi Wang, Qin Ge Ma, Xiao Ke Zheng, Wei Sheng Feng

中国化学快报. 2008, 19(10): 1234-1236. https://doi.org/10.1016/j.cclet.2008.06.041

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A new forsythenside,4-hydroxy-4-[8-[[1-[(4-hydroxyphenyl)acetyl]-β-D-glucopymllosyl-6-]oxy]ethyl]-2,5-cyclohexadien-1-one,named forsythenside F, wasisolasted from the plant of Forsythia suspensa(Thunb.) Vahl.The structure of the new compound was established on the basis of various spectroscopic analysis,including ¹H NMR, ¹³C NMR,2D NMR techniques(HMBC and HSQC),and HR-ESI-MS.

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A new angelol-type coumarin glucoside from Angelica pubescens

Xi Fei Ding, Xu Feng, Yun Fa Dong, Xing Zeng Zhao, Yu Chen, Ming Wang

中国化学快报. 2008, 19(10): 1237-1239. https://doi.org/10.1016/j.cclet.2008.07.023

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A new angelol-type coumarin glucoside,6-[(1R,2R)-1,2-dihydroxy-3-β-D-glucosyloxy-3-methylbutyl]-7-methoxycoumarin,wag isolated from the roots of Angelica pubescens.Its structure was elucidated on the basis of spectral analysis.

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A highly selective and sensitive fluorescent chemosensor for Zn²⁺

Xiu Ying Zhang, Zuo Hui Wang, Lin Yang

中国化学快报. 2008, 19(10): 1240-1243. https://doi.org/10.1016/j.cclet.2008.07.006

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A new selective Zn²⁺ fluorescent chemosensor,o-vanillin-4-ethoxybenzoylhydrazone(1),was designed and prepared.Free 1 mainly displayed very weak fluorescence at 480 nm upone xcitation at 403 nln.It displayed high selectivity for Zn²⁺ and had a 518-fold fluorescent enhancement upon binding of Zn²⁺, while the other cation ions had only little influence on the fluorescence of 1.Mechanism of enhancement of 1's fluorescence by Zn²⁺ was briefly discussed.

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Simultaneous electrochemical DNA hybridization assay for PAT and FMV 35S gene sequence using quantum dots as labels

Jiang Hua Zhong, Peng Qin, Wei Sun, Kui Jiao

中国化学快报. 2008, 19(10): 1244-1247. https://doi.org/10.1016/j.cclet.2008.06.036

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An electrochemical method for the simultaneous detection of two different DNA sequenees from PAT and FMV 35S gene sequence using CdS and PbS quantum dots (QDs)as labels was described.The QDs were readily functionalized with oligonucleotides as electrochemical DNA probes and selectively hybridized to the complementary sequences immobilized on the microplate.The QDs anchored on the hybrids were dissolved in the solution by the oxidation of HNO₃ and further detected by a sensitive differential pulse anodic stripping voltammetric method(DPASV).The DPASV signals of the oxidation of Cd²⁺ and Pb²⁺ ions present in the solution were difierent and reflected the identity of corresponding ssDNA targets sequences.

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Glucose, cellobiose, lactose and raffinose used as chiral stationary phases in HPLC

Jian Yu Wang, Feng Zhao, Mei Zhang, Ya Peng, Li Ming Yuan

中国化学快报. 2008, 19(10): 1248-1251. https://doi.org/10.1016/j.cclet.2008.07.003

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This paper presents the enantioseparation using glucose,cellobiose,lactose and raffinose as chiral selector bonded to silica gel via an arm in HPLC.Surprisingly,they also possess high enantioseparation selectivity,may be used in normal-phase and reversedphase mode.and there is a big chiral discriminating complementary.This work indicates that oligosacchafides could soon become very attractive as a new class of chiral stationary phase for HPLC.

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Influence of alkali mixed effect on the mixing enthalpy in 0.75B₂O₃-0.25[xNa₂O-(1-x)K₂O]glass system

A.Kouyate, A.E Ahoussou, A.Yapi, D.Diabate, J.Rogez, A.Trokourey

中国化学快报. 2008, 19(10): 1252-1255. https://doi.org/10.1016/j.cclet.2008.06.034

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The mixed alkali effect was investigated in the glass system 0.75B₂O₃-0.25[xNa₂O-(1-x)K₂O]through thermodynamic properties.The calorimetric measurements were performed in HF solution calorimetry at 298 K,The mixing enthalpy values show non-linear behaviour upon substitution of one alkali ion by another.This thermodynamic non-idealiIy is caused by the slight variations of distance between metallic cations,the macromolecular structure being unchanged.It can be explained,at least qualitatively,using electrolyte theory based on the Coulombic interactions of charged species originally developed by Debye and Hiickel.

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Preparation and hydrogen permeation properties of BaCe_0.95Nd_0.050_3-δ membranes

Ming Ya Cai, Hui Xia Luo, Zhong Li, Armin Feldhoff, Jiirgen Caro, Hai Hui Wang

中国化学快报. 2008, 19(10): 1256-1259. https://doi.org/10.1016/j.cclet.2008.06.054

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Dense mixed proton and electron conducting membrane made of BaCe_0.95Nd_0.05O_3-δ(BCNd5)was prepared by pressing followed by sintering.X-ray diffraction(XRD)was used to characterize the phase structure of both the powder and the sintered membranes.The microstructure of the sintered membranes was studied by scanning electron microscopy(SEM).Hydrogen permeation through the BCNd5 membrane was studied using a high temperature permeator.The hydrogen permeation fluxes under wet conditions are higher than those under dry conditions,which is due to H⁺ hopping via surface OH groups.At 925℃,a hydrogen permeation flux of 0.02 mL/min cm² was obtained under wet condition.which recommends BCNd5 as a potential material for hydrogen-selective membranes.

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Self-assembled helical nanostructures from an asymmetrical perylene diimide

Lan Ying Yang, Min Min Shi, Mang Wang, Hong Zheng Chen

中国化学快报. 2008, 19(10): 1260-1263. https://doi.org/10.1016/j.cclet.2008.07.008

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An asymmetrical perylene diimide 3,N-(4-methoxyphenyl)-N'-(4-nitrophenyl)-perylene-3,4,9,10-tetracarboxylic diimide,was synthesized,and its self-assembly and dissociation behaviors in chloroform was studied in detail bv UV-vis and fluorescence spectroscopies.The resulting unique helical nanostructures from 3 were proposed to be self-assembled via the cooperative actions of π-π stacking,steric hindrance and electrophile-nucleophile type pairing.

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2008年, 第19卷, 第10期　刊出日期：2008-10-20

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本期目录

2008年, 第19卷, 第10期 刊出日期：2008-10-20

2008年, 第19卷, 第10期　刊出日期：2008-10-20