中国化学快报

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Selective 3- and 6-OH modification of (-)-clausenamide

Jian Jun Xue, Xiao Ming Yu

中国化学快报. 2011, 22(07): 761-764. https://doi.org/10.1016/j.cclet.2011.01.026

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(-)-Clausenamide is a drug candidate under Phase I clinical trial for treatment of Alzheimer's disease (AD). In order to elucidate the substituent related structure-activity relationship, six one-substituent modified (-)-clausenamide analogues were designed, and four of them, namely 3-0-methyl, 6-0-methyl, 3-des-hydroxyl and 6-des-hydroxyl analogues were prepared by selective 3- and 6- OH modification of (-)-clausenamide.

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Synthesis and VEGF inhibitory activity of 16,17-pyrazo-annulated steroids

Hong Shan Liu, Hu Ling Zheng, Mei Ge, Peng Xia, Ying Chen

中国化学快报. 2011, 22(07): 757-760. https://doi.org/10.1016/j.cclet.2010.12.043

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Eight 16,17-pyrazo-annulated steroidal derivatives were synthesized and evaluated in vitro vascular endothelial growth factor (VEGF) inhibitory activity with 2-methoxyestradiol (2-ME) as the reference compound. Most of the compounds showed potent VEGF inhibitory activity with EC50 values of micromolar or submicromolar range. Among them, the compounds 3 and 8 exhibited similar EC₅₀ values and obviously better TI values compared with 2-ME.

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Asymmetric synthesis of L-carnitine from (R)-3-chloro-1,2-propanediol

Xu Qin Li, Yun Xu Yang Wei Li Wang, Bin Hu, Hui Min Xue, Tian Yi Zhang, Xue Tao Zhang

中国化学快报. 2011, 22(07): 765-767. https://doi.org/10.1016/j.cclet.2011.01.007

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A practical chemical synthesis of L-carnitine (1) has been accomplished from (R)-3-chloro-l,2-propanediol ((R)-4), which is a main by-product originated from (R,R)-Salen Co(Ⅲ) catalyzed hydrolytic kinetic resolution (HKR) of (±)-epichlorohydrin (R)-4 was utilized as a chiral starting material to prepare the key intermediate cyclic sulfite ((R)-5). The new synthetic approach demonstrated an efficient utilization of organic by-product for the asymmetric synthesis of bioactive compounds.

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Synthesis and evaluation of nitrate derivatives of colchicine as anticancer agent

Li Hong Shen, Ya Li, Da Hai Zhang, Yi Sheng Lai, Li Jie Liu

中国化学快报. 2011, 22(07): 768-770. https://doi.org/10.1016/j.cclet.2010.12.037

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To search for more potent antitumor agent, a series of novel nitric oxide-donating colchicine (Col) derivatives (6a-f, 8a and b) were synthesized by coupling nitrates with N-methyl colchiceinamide. Their cytotoxicity against four human cancer cell lines in vitro were evaluated by MTT assay. It was found that many of the derivatives displayed significant activity, particularly, compounds 6c, 8a and 8b showed more potent cytotoxic activities than Col.

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Synthesis of 4H-chromene derivatives by reaction between alkyl isocyanides and dialkyl acetylenedicarboxylate in the presence of 6-hydroxyquinoline

Bita Mohtat, Hoorieh Djahaniani, Issa Yavari, Masomeh G. Dehbalaei, Saba A. Jam

中国化学快报. 2011, 22(07): 771-773. https://doi.org/10.1016/j.cclet.2011.01.005

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The reactive intermediate generated by the addition of alkyl isocyanides to dialkyl acetylenedicarboxylate was trapped by 6-quinolinol to produce highlyfunctionalized 4H-chromenes in fairly good yields.

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Rapid construction of the tricyclic cores of the abietane-and icetexane-type diterpeno

De Lin Chen, Xiao Yu Liu, Hang Cheng, Feng Peng Wang

中国化学快报. 2011, 22(07): 774-776. https://doi.org/10.1016/j.cclet.2011.01.009

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A short synthesis of the tricyclic 6–6–6 and 6–7–6 ring systems of the abietane- and icetexane-type diterpenoids from a common intermediate is presented, using alkylation and acid-catalyzed cyclization as key steps.

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CsF mediated rapid condensation of 1,3-cyclohexadione with aromatic aldehydes:Comparative study of conventional heating vs.ambient temperature

Kamalakar P. Nandre, Vijay S. Patil, Sidhanath V. Bhosale

中国化学快报. 2011, 22(07): 777-780. https://doi.org/10.1016/j.cclet.2011.01.002

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A mild, efficient and high yielding protocol for the synthesis of 2,2'-arylmethelene dicyclohexane-1,3-dione derivatives at room temperature and 9-aryl-l,8-dihydrooctahydroxanthene at conventional heating using cesium fluoride as a catalyst is reported. The major advantages of this reaction are excellent yield, very short reaction time and use of inexpensive catalyst.

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Synthesis and biological evaluation of andrographolide derivatives as potent anti-HIV agents

Bin Wang, Jing Li, Wen Long Huang, Hui Bin Zhang, Hai Qian, Yong Tang Zheng

中国化学快报. 2011, 22(07): 781-784. https://doi.org/10.1016/j.cclet.2011.01.015

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A series of Andro derivatives were described and evaluated for their anti-HIV activity in vitro. Compound 10 and 16b, of which TI were > 10, had some anti-HTV-1 activity in vitro. Therein, compound 10 which was the best potent compound, could serve as a new lead for further development of anti-AIDS agents.

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Synthesis of polynorbornene with pendant moiety bearing azide and terminal alkyne groups

Ze Zhang, Zhi Wei Peng, Kun Zeng Fan

中国化学快报. 2011, 22(07): 785-788. https://doi.org/10.1016/j.cclet.2010.12.020

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A powerful approach to the synthesis of an unprecedented polynorbornene with pendant moiety bearing azide and terminal alkyne groups is developed. Two key intermediates, namely, 3-azido-5-(2-(trimethylsilyl)ethynyl) benzyl alcohol and 4-(4-aza-tricyclo [5.2.1.0^2.6]dec-8-en-4-yl) benzoic acid, were optimally synthesized for convergent synthesis of the corresponding monomer.

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An efficient synthesis of 3-(guaiazulene-l-yl)succinimides by addition of guaiazulene to maleimides

Dao Lin Wang Shao Fei Li, Wei Li, Yuan Feng Li, Li Nan Lin

中国化学快报. 2011, 22(07): 789-792. https://doi.org/10.1016/j.cclet.2011.01.003

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A facile, efficient synthesis of 3-(guaiazulen-l-yl)succinimides was developed by Michael-type addition of guaiazulene to maleimides in the presence of p-toluenesulfonic acid under mild reaction conditions.

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Potassium ferro-cyanide trihydrate complex catalyzed one-pot synthesis of 2-phenylimidazo [4,5-f] [1,10] phenanthroline

Syed Shahed Ali

中国化学快报. 2011, 22(07): 793-796. https://doi.org/10.1016/j.cclet.2011.01.017

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Various 2-phenylimidazo [4,5-f] [1,10] phenanthrolines were synthesized from potassium ferro-cyanide trihydrate (KFCT) complex catalyzed three component reaction of 1,10-phenanthroline-5,6-dione, aromatic aldehydes and ammonium acetate at room temperature in excellent isolated yield. This is a simple and straight forward, high yielding, not involving any hazardous or expensive catalyst method.

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Guanidine hydrochloride:An active and simple catalyst for Mannich type reaction in solvent-free condition

Majid M. Heravi, Masoumeh Zakeri, Narges Mohammadi

中国化学快报. 2011, 22(07): 797-800. https://doi.org/10.1016/j.cclet.2010.12.046

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Commercially available guanidine hydrochloride (GuHCl) has been found to be a highly efficient catalyst for the Mannich reaction. β-Amino carbonyl compounds were obtained in reasonable yields when the Mannich reaction was carried out at room temperature under solvent-free conditions.

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First total synthesis of two new heterocyclic compounds:Bretschneiderazines A and B

Qing Chao Liu, Tian Tian Guo, Zheng Fan, Dong Li, Wen Hong Li

中国化学快报. 2011, 22(07): 801-803. https://doi.org/10.1016/j.cclet.2010.11.036

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Facile synthesis of the two new natural heterocyclic compounds bretschneiderazines A (2) and B (3), isolated from an extract of the stems of Bretschneidera sinensis, is reported. We employed the cyclization reaction of benzamide by directed lithiation and sequential treatment with sulfur and phosgene as key steps. All new compounds have been fully characterized by means of IR, ¹H NMR, ¹³C NMR, and HRMS.

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Synthesis and antitumor evaluation of fluoroquinolone C3 fused heterocycles (Ⅱ):From triazolothiadiazines to pyrazolotriazoles

Guo Qiang Hu, Li Li Hou, Yong Yang, Lei Yi, Song Qiang Xie, Guo Qiang Wang, Nan Nan Duan, Tie Yao Chao, Xiao Yi Wen, Wen Long Huang

中国化学快报. 2011, 22(07): 804-806. https://doi.org/10.1016/j.cclet.2011.01.018

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To further expand an effective modified route for the shift from an antibacterial fluoroquinolone (FQ) to an antitumor FQ, two series of title compounds based on an isostere of the FQ C3 carboxylic group with two fused heterocyclic rings, [l,2,4]triazolo[3,4-b][l,3,4]thiadiazine and pyrazolo[5,l-c][l,2,4]triazole, respectively, were designed and synthesized starting from the current antibacterial FQs, and their in vitro antitumor activity against L1210, CHO cell lines were evaluated via their respective IC50 values.

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PPA-SiO₂ catalyzed efficient synthesis of polyhydroquinoline derivatives through Hantzsch multicomponent condensation under solvent-free conditions

Amir Khojastehnezhad, Farid Moeinpour, Abolghasem Davoodnia

中国化学快报. 2011, 22(07): 807-810. https://doi.org/10.1016/j.cclet.2010.12.051

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Silica gel-supported polyphosphoric acid (PPA-SiO₂) was found to be an efficient catalyst for the one-pot four-component Hantzsch condensation reaction of aryl aldehydes, dimedone, ethyl acetoacetate and ammonium acetate to afford the corresponding polyhydroquinoline derivatives in high yields. The main advantages of the present approach are short reaction times, clean reaction profiles, simple experimental and workup procedures.

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Cyanuric chloride-catalyzed synthesis of 10-aryl-6,8-dimethyl-6,10-dihydro-5-oxa-6,8-diazaanthra[2,3-d] [1,3]dioxole-7,9-diones

Wei Lin Li, Qiu Yan Luo, Fu Lin Yan

中国化学快报. 2011, 22(07): 811-814. https://doi.org/10.1016/j.cclet.2011.01.020

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An environmentally friendly procedure for the preparation of 10-aryl-6,8-dimethyl-6,10-dihydro-5-oxa-6,8-diazaanthra[2,3-d] [1,3]dioxole-7,9-diones under thermal solvent-free conditions in the presence of cyanuric chloride as heterogeneous catalyst was developed.

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Microwave promoted rapid dehydration of aldoximes to nitrites using melamine-formaldehyde resin supported sulphuric acid in dry media

Ramin Rezaei Marzeih Karami

中国化学快报. 2011, 22(07): 815-818. https://doi.org/10.1016/j.cclet.2011.01.008

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A simple and convenient procedure for the synthesis of nitriles by dehydration of aldoxime using supported sulphuric acid on melamine-formaldehyde resin (MFR) under solvent-free condition has been developed. A variety of aromatic and aliphatic aldoximes were converted to the corresponding nitriles. The resin was recovered and reused for subsequent reactions.

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Facile synthesis and characterization of a novel thiophene-fused polycyclic aromatics based on pyrene

Zong Fan Duan, Zhi Gang Yang, Dong Jie Liu, Li Cai, Daiki Hoshino, Tsuyoshi Morita, Gao Yang Zhao, Yasushiro Nishioka

中国化学快报. 2011, 22(07): 819-822. https://doi.org/10.1016/j.cclet.2010.12.054

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A novel large thiophene-fused polycyclic aromatics 1 based on pyrene 5 has been synthesized, and its structure was confirmed by 1H NMR, ^13>C NMR, MS, UV–vis and elemental analysis. The key steps of the synthesis involved the Stille cross-coupling reaction and followed by selective β-β oxidative cyclization of pendant thienyl rings by FeCl₃ under mild conditions.

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A novel approach for synthesis of 3-amino-5-aryl-2,5-dihydropyridazines using onium salt as soluble support

Meng Gao, Cui Fen Lu Gui Chun Yang, Zu Xing Chen

中国化学快报. 2011, 22(07): 823-826. https://doi.org/10.1016/j.cclet.2010.12.055

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In this work it was presented an application of task specific onium salt as soluble support for the synthesis of 3-amino-5-ary 1-2,5-dihydropyridazines. This soluble support is of wide applicability and combines advantages of solid phase synthesis without its limitations with those of solution phase chemistry. After a simple washing step, products were cleaved from the supports and obtained in good yields.

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Melamine-(H₂SO₄)₃ and PVP-(H₂SO₄)n as solid acids:Synthesis and application in the first mono- and di-nitration of bisphenol A and other phenols

Gholamabbas Chehardoli, Mohammad Ali Zolfigol, Seyedeh Bahareh Azimi, Ebadollah Alizadeh d

中国化学快报. 2011, 22(07): 827-830. https://doi.org/10.1016/j.cclet.2011.01.021

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Melamine and poly vinylpyrrolidone (PVP) reacted with neat sulfuric acid readily to form two new organic solid acids namely melamine-(H₂SO₄)₃ and PVP-(H₂SO₄)n· These solid acids were used for the first nitration of bisphenol A as well as other phenols in the presence of NH₄NO₃. Mono- and di-nitro bisphenol A have been characterized with IR and ¹H NMR techniques.

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Design, synthesis and preliminary bio-evaluation of glucose-cholesterol derivatives as ligands for brain targeting liposomes

Fan Lei, Wei Fan, Xian Kun Li, Shan Wang, Li Hai, Yong Wu

中国化学快报. 2011, 22(07): 831-834. https://doi.org/10.1016/j.cclet.2010.12.056

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A series of glucose-cholesterol derivatives 8a-8e as ligands for brain targeting liposomes were synthesized. The preparation of compound 6 involved temporary protection of glucose with chlorotrimethylsilicane and hexamethyldisilazane followed by selectively hydrolyzed. The known cholesteryl tosylate 1 were coupled to ethylene glycols to afford alcohol 2a-2e. Substitution and deprotection of alcohol 2a-2e furnished the acids 4a-4e, which was condensed with compound 6 to get compounds 7a-7e, and then was deprotected in tetrahydrofuran with TEA to obtain the title compounds. As a model drug, tegafur was entrapped by liposomes coupled with 8b, and preliminary in vivo evaluation shown 8b could enhance the ability of liposomes delivering tegafur across the blood brain barrier.

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Two new kaempferol glycosides from the seeds of Camellia semiserrata Chi

Ling Tang, Xiao Juan Wu, Bao Min Feng, Li Ying Shi, Xue Yan Fu, Yong Qi Wang, Mei Feng Liu

中国化学快报. 2011, 22(07): 835-838. https://doi.org/10.1016/j.cclet.2011.01.014

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Two new acetylated kaempferol glycosides were isolated from the seeds of Camellia semiserrata Chi, their structures were elucidated as kaempferol-3-O-[(3-0-acetyl)-α-L-rharnnopyranosyl(1→3)(4-O-acetyl)-α-rhamnopyranosyl(l→6)-β-D-gluco-pyranoside] (1) and kaempferol-3-O-[(2-O-acetyl)-α-L-rhamnopyranosyl (1→3)(4-O-acetyl)-α-L-rhamnopyranosyl(l→6)-β-d-gluco-pyranoside] (2) by spectral experiments (including ESI-MS, ID- and 2D-NMR).

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Identification of the metabolites of biologically active xanthones isolated from Halenia elliptica D.Don by high performance liquid chromatography coupled to ion trap time-of-flight mass spectrometry

Ru Feng, Jian Gong Shi, Xiao Wei Liu, Chun Tao Che, John H. K. Yeung, Yan Wang

中国化学快报. 2011, 22(07): 839-842. https://doi.org/10.1016/j.cclet.2010.12.021

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Metabolism study has been carried out on 1-hydroxy-2,3,5-trimethoxyxanthone (HM-1) and 1-hydroxy-2,3,4,7-tetramethoxyxanthone (HM-2), which are two biologically active ingredients isolated from the Tibetan herb, <Halenia elliptica D.Don., in rat liver microsomes in vitro. A method of high performance liquid chromatography coupled to ion trap time-of-flight mass spectrometry (LCMSn-ESI-IT-TOF) was applied to analyze metabolites of HM-1 and HM-2 on line, and five metabolites were identified containing 1,5-dihydroxy-2,3-dimethoxyxanthone (HM-5), 1,7-dihydroxy-2,3,4-trimethoxyxanthone (HM-9), 1,4, 7- trihydroxy-2,3-dimethoxyxanthone (HM-10), 1,4-dihydroxy-2,3,7-trimethoxyxanthone (HM-11) and 1,2-dihydroxy-3,4,7- trimethoxyxanthone (HM-12). Among these metabolites, HM-9, HM-11, and HM-12 were isomers mutually. The results indicated that HM-1 and HM-2 occurred Phase I metabolic reaction of demethylation in rat microsomes in vitro.

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Probing cytotoxicity of CdSe and CdSe/CdS quantum dots

Yan Jie Bao, Jun Jun Li, Yi Ting Wang Lei Yu, Lei Lou, Wei Ji Du, Zi Qiang Zhu, Hui Peng, Jian Zhong Zhu

中国化学快报. 2011, 22(07): 843-846. https://doi.org/10.1016/j.cclet.2010.12.008

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Toxicities of CdSe and CdSe/CdS quantum dots (QDs) synthesized by ultrasound-assisted methods were investigated in vitro and in vivo. Five human cell lines were used to assess the cytotoxicity of as-prepared CdSe and CdSe/CdS by assays of MTT viability, red blood cell hemolysis, flow cytometry, and fluorescence imaging. The results show that these QDs may be cytotoxic by their influence in S and G2 phases in cell cycles. The cytotoxicity of QDs depends on both the physicochemical properties and related to target cells.

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Crystal structure of β-cyclodextrin-4-chlorobenzoic acid complex:Unusual C-Cl···π interaction between 4-chlorobenzoic acids in β-cyclodextrin dimer

En Ju Wang Guang Ying Chen

中国化学快报. 2011, 22(07): 847-850. https://doi.org/10.1016/j.cclet.2011.01.016

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The inclusion complex of β-cyclodextrin (β-CD) with 4-chlorobenzoic acid was synthesized and its crystal structure was determined by single crystal X-ray diffraction under cryogenic condition. The complex contains two β-CDs, two 4-chlorobenzoic acids and twenty-nine water molecules in the asymmetric unit, and can be formulated as 2(C42H₇₀O₃₅) 2(C₇H₅O₂Cl) 29(H₂O). In the crystal lattice, two β-CDs form a face-to-face dimer jointed together through hydrogen bonding between the secondary hydroxyl groups of β-CDs. Two 4-chlorobenzoic acid molecules which contact by C-Cl···π interactions are included in the β-CD dimer cavity. The β-CD dimers are arranged in brickwork-like pattern along the crystallographic a-axis. The effect of guest molecule length on the inclusion geometry was discussed by comparative study of some β-CD complexes containing similar guests. # 2011 En Ju Wang. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.

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Determination of L-phenylalanine by cucurbit[7]uril sensitized fluorescence quenching method

Chang Feng Li, Li Ming Du, Hao Wu, Ying Xia Chang

中国化学快报. 2011, 22(07): 851-854. https://doi.org/10.1016/j.cclet.2010.12.029

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The determination method of L-phenylalanine (LPA) by fluorescence quenching was developed. The assay was based on the combination of the cucurbit[7]uril (CB[7]) with palmatine hydrochloride (PAL) reaction. In the presence of CB[7], the fluorescence of PAL was quenched by LPA which can be employed to detect LPA. Under the optimal conditions, a linear range 3.63×10^-8-9.68×10^-6 mol/L and a detection limit 1.27×10^-8 mol/L of LPA were obtained. The relative standard deviation (R.S.D) was 1.8% obtained from a series of11 standards each containing 6.05×10^-6 mol/L oLPA. This paper also discusses the mechanism of fluorescence indicator probe.

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Micro-Raman studies on the conformational behaviors of monosodium glutamate in dehydration process

Jing Jing Shou, Guang Zeng, Hao Zhang, Yun Hong Zhang

中国化学快报. 2011, 22(07): 855-858. https://doi.org/10.1016/j.cclet.2010.12.022

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The conformational behaviors of monosodium glutamate (MSG) in a dehydration process were studied by Micro-Raman spectroscopy in combination with Hartree-Fock calculations using 6-31+G^* method. The dehydration process of the MSG droplet was performed by decreasing the ambient relative humidity (RH). The intensity ratio of the 935 cm^-1 band to 884 cm^-1 band (I₉₃₅/ I₈₈₄) kept decreasing when RH decreased. By optimizing the geometries with different fixed dihedral angles, the downtrend of (I₉₃₅/ I₈₈₄) is found to be due to the reduction of MSG molecular volume.

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Adsorption of graphene oxide/chitosan porous materials for metal ions

Yong Qiang He, Na Na Zhang, Xiao Dong Wang

中国化学快报. 2011, 22(07): 859-862. https://doi.org/10.1016/j.cclet.2010.12.049

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Porous graphene oxide/chitosan (PGOC) materials were prepared by a unidirectional freeze-drying method. Their porous structure, mechanical property and adsorption for metal ions were investigated. The results show that the incorporation of graphene oxide (GO) significantly increased the compressive strength of the PGOC materials. The saturated adsorption capacity of Pb²⁺ increased about 31%, up to 99 mg/g when 5 wt% GO was incorporated These biodegradable, nontoxic, efficient PGOC materials will be a potential adsorbent for metal ions in aqueous solution.

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A novel cell-impermeable fluorescent zinc sensor containing poly(ethylene glycol) chain

Ning Zhang, Yi Su, Miao Yu

中国化学快报. 2011, 22(07): 863-866. https://doi.org/10.1016/j.cclet.2011.01.006

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A novel cell-impermeable zinc sensor was synthesized by incorporating poly(ethylene glycol) (PEG) to N-(8-quinolyl)-p-aminobenzenesulfonamide (HQAS) group. The polymeric zinc sensor combines both valuable features of HQAS and PEG. The HQAS of the sensor has the similar functions to TSQ, and exhibits a good fluorescence response to Zn²⁺ but poor fluorescence responses to other metal ions. The PEG chain can prevent the sensor to permeate healthy cell membrane. The stained experiments with the yeast cells as model showed that the sensor cannot stain the healthy yeast cells, but only the damaged or died yeast cells. These results indicated the novel zinc probe was a typical cell-impermeable zinc sensor.

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Facile fabrication of porous pure and Ag nanoparticle-doped poly(4-vinylpyridine) films at the liquid-liquid interfaces

Zhi Bin Ren, Jiang Liu, Yu Ping Chen, Meng Chen, Dong Jin Qian

中国化学快报. 2011, 22(07): 867-870. https://doi.org/10.1016/j.cclet.2010.12.042

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We reported an interfacial self-assembly of regularly layered porous poly(4-vinylpyridine) (P4VP) films at the interfaces of water-chloroform or-dichloroethane. The porous diameters were in the range from hundred nanometers to several micrometers. It was revealed that formation of such kind of porous materials was solvent dependent. Moreover, cyclic Ag nanoparticles could be grown in the porous P4VP films to form Ag–P4VP nanohybrids under radiation.

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Tetrabutylammonium salts of tritransition-metal-substituted A-α-tungstogermanate:Halogen-free and single-component catalysts for the coupling reaction of carbon dioxide and epichlorohydrin

Fa Wang Chen, Tao Dong, Xiao Fang Li, Tie Gang Xu, Chang Wen Hu

中国化学快报. 2011, 22(07): 871-874. https://doi.org/10.1016/j.cclet.2011.01.004

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The green synthesis of chloropropylene carbonate via the coupling reaction of carbon dioxide and epichlorohydrin had been achieved using halogen-free and single-component catalysts tetrabutylammonium salts of tritransition-metal-substituted A-α-tungstogermanate [(n-C₄H₉)₄N]₃H₇GeW₉M₃(H₂O)₃O₃₇ (M = Cu^Ⅱ, Ni^Ⅱ, Co^Ⅱ and Mn^Ⅱ) without any solvent. The catalytic activity was significantly depended on the transition metal introduced in polyoxometalates. [(n-C₄H₉)₄N]₃H₇GeW₉Mn₃(H₂O)₃O₃₇ exhibited the highest catalytic activity with 94.9% conversion for epichlorohydrin and 98% selectivity for chloropropylene carbonate in 3 h. Plausible mechanism was proposed based on the results.

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Fabrication of nanoreactors based on polyoxoperoxometalates and enhancement of their catalytic activity

Mei Jie Wei, Chun Li Zhang, Cong Liang Sun, Ang Li, Xiao Hong Wang

中国化学快报. 2011, 22(07): 875-878. https://doi.org/10.1016/j.cclet.2011.01.001

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The nanoreactors were fabricated by reacting amphiphilic quaternary ammoniums and polyoxoperoxometalates K_n[PW_12-xTi_x-O_40-x(0₂)_x] (x=1, 2 and 3; n = 5, 7 and 9) (K₅[PW₁₁TiO₃₉(O₂)], K₇[PW₁₀Ti₂O₃₈(O₂)2] and K₉[PW₉Ti₃O₃₇(O₂)3]). Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM) were used to characterize the resulting samples. This kind of nanocatalysts could promote NH₄SCN' degradation into simple inorganic compounds such as SO₄^2-, HCO₃^- and NO₃^- only using oxygen as an oxidant under room conditions.

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Synthesis of Cu₂O nanobelts via surfactant-assisted polyol method

Xin Wen Huang, Zong Jian Liu, Yi Fan Zheng

中国化学快报. 2011, 22(07): 879-882. https://doi.org/10.1016/j.cclet.2010.12.032

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The synthesis of nanostructured Cu₂O was conducted in a non-aqueous solution via polyol method at a temperature of 130 ℃. It was found that the formation of Cu₂O nanobelts was heavily dependent on the presence of surfactant cetyltrimethylammonium bromide (CTAB). Cu₂O nanobelts with 100-400 nm in width and several micrometers in length were only observed when CTAB was used, whereas in other cases where CTAB was absent or CTAB was replaced with polyvinylpyrrolidone (PVP K-30), only spherical or cube-like particles were formed. The formation mechanism of Cu₂O nanobelts was discussed.

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本期目录

2011年, 第22卷, 第07期　刊出日期：2011-07-20

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2011年, 第22卷, 第07期 刊出日期：2011-07-20

2011年, 第22卷, 第07期　刊出日期：2011-07-20