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PDF file Download: JCCS_V56_6_1257-1264.pdf
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| Preparation of Silica Supported Tin Chloride: As a Recyclable Catalyst for
the Silylation of Hydroxyl Groups with HMDS |
| Khodabakhsh Niknam,* Mohammad Ali Zolfigol, Dariush Saberi and Hajar Molaee |
| Silica-supported tin chloride [SiO2-Sn(Cl)4-n] has been prepared by mixing tin chloride with activated silica gel. An alcoholic and phenolic hydroxyl groups were converted into their corresponding trimethylsilyl ethers with hexamethyldisilazane in the presence of catalytic amounts of silica supported tin chloride at room temperature. This catalyst could be recycled and reused fifteen times without loss efficiency. |
| VOL.56 NO.6 (2009/12) |
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PDF file Download: JCCS_V56_6_1244-1249.pdf
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| Hybrid Silver Nanowire/Titanium Oxides Nanocomposites as Anode for Dye-Sensitized Solar Cell Application |
| Tsan-Yao Chen, Chia-Ming Fan, Jun-Yi Wu, and Tsang-Lang Lin* |
| The DSSC with TiO2 coated silver nanowires shows significantly improved photovoltaic efficiency and structural durability compared with that of the standard P-25 and the silver nanowires without coating. The coating of silver nanowires improves the structrual durability by making the silver nanowires resistant to the corrosion by the iodine electrolyte as well as to enhance the photoconversion. |
| VOL.56 NO.6 (2009/12) |
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PDF file Download: JCCS_V56_6_1236-1243.pdf
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| Improved Catalytic Performance of Pt Supported on Multi-Wall Carbon
Nanotubes as Cathode for Direct Methanol Fuel Cell Applications
Prepared by Dual-stepped Surface Thiolation Processes |
| Tsan-Yao Chen, Tsang-Lang Lin*, Chien-Chung Chenb,Chieng-Ming Chen and Chia-Fu Chen |
| The electrode of multi-walled carbon nanotubes was treated by a dual-stepped surface thiolation process. The carbonate ligands were landed at the surface of MWCNTs by nitric acidifies. Thiol groups were conjugated at the CNT-COO- end in the second step. The obtained MWCNTs electrode contains significantly improved Pt nanoparticles dispersion and methanol electrooxidation activities (improved by 350%) comparing to that treated by acidifies reactions. |
| VOL.56 NO.6 (2009/12) |
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PDF file Download: JCCS_V56_6_1231-1235.pdf
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| Preparation of Antibacterial Waterborne Polyurethane/silver
Nanocomposite |
| Chein-I Wu, Jiann-Wen Huang, Ya-Lan Wen,
Shaw-Bing Wen,* Yun-Hwei Shen* and Mou-Yung Yeh* |
| The nano-size silver particles are prepared through mixing aqueous solution of AgNO3 and WPU reduced by NaBH4. The particle size of Ag is dependent on the concentration of AgNO3. Higher AgNO3 concentration results in larger particle. Transparent WPU/Ag nanocomposite films are formed after solvent (water) evaporation. The WPU matrix can prevent the Ag particles from aggregating. The WPU/Ag nanocomposite films possess good antibacterial activity. |
| VOL.56 NO.6 (2009/12) |
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PDF file Download: JCCS_V56_6_1225-1230.pdf
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| Effect of Manganese Dioxide Dispersion on the Absorbing Properties of
Manganese Dioxide (MnO2)-Epoxy Composites
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| Tzu-Hao Ting |
| In this work, Manganese dioxide (MnO2) particle was synthesized and introduced into epoxy resin to be microwave absorber. XRD and TEM studies have established formation of MnO2 particle. It is obvious that epoxy-MnO2 composites increase performance of microwave absorbing properties in 2–18 GHz and 18-40 GHz.. The absorbing performance of MnO2-epoxy composites at same sample thickness and at various sample thickness were also studied. It was found that the best absorbing property and an absorption frequency range shifting could be obtained at the frequency range of 2–18 and 18–40 GHz. |
| VOL.56 NO.6 (2009/12) |
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PDF file Download: JCCS_V56_6_1216-1224.pdf
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| Syntheses, Structures and Luminescent Properties of Metal Halide
Complexes Containing 2,3-Diphenylquinoxaline |
| Chun-Wei Yeh, Umasankar Ray and Jhy-Der Chen* |
| The reaction of 2,3-diphenylquinoxaline (L) with CuI afforded the dinuclear complex [CuI(L)]2, whereas with MX2 (M = Cu, Hg; X = Cl, Br) gave the mononuclear complexes CuX2(L)2 and HgX2(L)2. The molecules are interlinked through C-H---π and/or π - π stacking and anion---π interactions. It is concluded that metal complexes containing L ligands and without coordinated or packed solvent have a tendency to form a 0-D structure. |
| VOL.56 NO.6 (2009/12) |
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PDF file Download: JCCS_V56_6_1205-1215.pdf
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| The π-Bonding Trend in VIB M(CO)6 Observed by NMR Spectroscopy - A Natural Bond Orbital View |
| Shao-Pin Wang*, Ker-Ming Yan, Wen-Yi Hsu,
Min-Ying Huang and Hui-Ying Wu |
| Among 6B M(CO)6, the unusually high 2π population in Cr(CO)6 is ascribed to the strongest hyperconjugative donor‐acceptor interactions, 5σ → 2π and σΜ‐CO → 2π. |
| VOL.56 NO.6 (2009/12) |
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FULL PAPER |
PDF file Download: JCCS_V56_6_1198_1204.pdf
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| Geometric Effects on Conductance in Single Molecule Electron Transport
Junctions |
| Shang-Chieh Hsieh, Fur-Der Mai, Soonmin Jang, Hong-Yi Tang and Feng-Yin Li* |
| Conductance of a dithiol-benzene molecule sandwiched between two gold electrodes was studied theoretically. The conductance differences between the simplified models and the model without simplification were examined. The disturbance in Au contact surfaces is the major factor for the conductance difference. To obtain better results, the center molecule of the molecular junction should be at least optimized with post-HF methods. |
| VOL.56 NO.6 (2009/12) |
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FULL PAPER |
PDF file Download: JCCS_V56_6_1191-1197.pdf
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| Synthesis and Characterization of Novel Arylaldehyde
(Arylketone)-(4-substituted phenyl-5-substituted
phenoxy-methyl-4H-1,2,4-triazole-3-yl)-thiol Acetyl Hydrazones |
| Heng-Wen Zhang, Yan-Ping Li*, Chen-Jiang Liu, Hai-Long Li and Wen-Li Sun |
| Fourteen novel arylaldehyde-(4-substituted phenyl-5-substituted phenoxy-methyl-4H-1,2,4-triazole-3-yl)-thiol Acetyl Hydrazone derivatives were synthesized by 4-substituted phenyl-5-substituted phenoxy-methyl-1,2,4-triazole-3-thione as starting material according to substructure link principle, followed by thioetherification, hydrazide reaction and hydrazone reaction. The structures of these compounds were confirmed by IR, 1H NMR and elemental analysis. Crystal structure of compounds 1b and 6d were determined by the X-ray diffraction. |
| VOL.56 NO.6 (2009/12) |
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PDF file Download: JCCS_V56_6_1186_1190.pdf
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| A New Diterpenoid and Other Constituents from Acanthopanax brachypus Harms |
| Hao-Bin Hu and Jun Fan* |
| A new labdane-type diterpene glycoside, 3α-trans-sinapoyloxy-jhanol 18-O-β-D-glucopy ranoside (1), together with four known compounds (2-5) were isolated from the stem bark of Acanthopanax brachypus. Their structures were characterized by means of spectroscopic methods, including 1H, 13C, 2D-NMR and HR-MS, as well as chemical methods and comparison with the literature data. |
| VOL.56 NO.6 (2009/12) |
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PDF file Download: JCCS_V56_6_1180-1185.pdf
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| Facile Access to Benzothiazole-containing Pyrrolo[1,2-a]quinolines and
Pyrrolo[2,1-a]isoquinolines via Nitrogen Ylides |
| Kamal M. Dawood,* Eman A. Ragab and Nabila A. Khedr |
| Quinoline and isoquinoline react with 2-(bromoacetyl)benzothiazole (1) in dry benzene to give the corresponding quinolinium and isoquinolinium salts 2 and 10 which undergo base-mediated [3+2] 1,3-dipolar cycloaddition with some acetylene and ethylene derivatives to give the corresponding benzothiazole-containing pyrrolo[1,2-a]quinoline and pyrrolo[2,1-a]isoquinoline derivatives. |
| VOL.56 NO.6 (2009/12) |
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PDF file Download: JCCS_V56_6_1175-1179.pdf
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| Ultrasound Assisted Synthesis of Coumarin Thioglycopyranoside Derivatives |
| Lei Yu, Jian-Fang Gao and Ling-Hua Cao* |
| The methyl coumarins reacted with N-bromo-succinimide gave compounds a~c which on further reacted with various peracetyl sulfhydryl glycose (1~3) under ultrasonic irradiation afforded a series of novel coumarin thioglycopyranoside derivatives 1a~1c, 2a~2c, 3a~3c. This method offered several advantages such as excellent yields and short reaction times. All the new compounds were characterized on the basis of the IR, 1H NMR, 13C NMR and elemental analysis. |
| VOL.56 NO.6 (2009/12) |
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FULL PAPER |
PDF file Download: JCCS_V56_6_1168-1174.pdf
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| Investigation of the Reaction of Gold(III) with
2-[2-(4-Dimethylamino-phenyl)-vinyl]-1,3,3-trimethyl-3H-indolium. Application for Determination of Gold |
| Rastislav Serbin, Yaroslav R. Bazel, Marcel Torok, Josef Havel, Ioseph S. Balogh,
Zholt O. Kormosh,* Gabriela Holéczyová and Vasil Andruch |
| A new, simple, rapid, sensitive, efficient and low-cost spectrophotometric procedure for the determination of gold was developed. The method is based on the reaction of [AuCl4]- with 2-[2-(4-dimethylamino-phenyl)-vinyl]-1,3,3-trimethyl-3H-indolium reagent to form a colored ion associate extractable by various organic solvents.
The molar absorptivity of the ion associates is in the range (5.7-9.2)×104 L mol-1 cm-1 depending on the extractant. Butyl acetate was chosen as the extractant. The optimum reaction conditions were established: pH 2-4, concentration of the dye reagent (0.8-1.5)×10-4 mol L-1. |
| VOL.56 NO.6 (2009/12) |
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PDF file Download: JCCS_V56_6_1163-1167.pdf
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| Separation of the Phenoxy Acid Herbicides and Their Enantiomers by Capillary Zone Electrophoresis in Presence of Highly Sulphated Cyclodextrins |
| Ashok Kumar Malik,* Jatinder Singh Aulakh, Agnes Fekete and Philippe Schmitt-Kopplin |
| Capillary zone electrophoresis was used for the chiral and mutual separation of four phenoxy acid herbicides namely fenoprop (1, 1'), dicloprop (2, 2'), mecoprop (3, 3') and 2, 4- DB (4) using highly sulphated cyclodextrins (HSCD) in the ammonium formate buffer. With -HSCD the required base line separation was achieved. The limit of detection (S/N=3) achieved are 0.15 ppm, 0.14 ppm, 0.14 ppm and 0.11ppm for fenoprop dicloprop, mecoprop and 2,4-DB, respectively. |
| VOL.56 NO.6 (2009/12) |
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FULL PAPER |
PDF file Download: JCCS_V56_6_1156-1162.pdf
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| A Novel Method for Uric Acid Determination Using CdS Quantum Dots as Fluorescence Probes |
| Su-Qin Han* and Shou-Miao Zhao |
| A novel method has been developed for uric acid analysis based on the quenching of fluorescence emission from CdS quantum dots by uric acid. Also, the effect of different surfactant agents, in order to improve the fluorescent signals of the CdS QDs, has been investigated, and CTAB was selected. The limit of detection (S/N=3) was 0.1 ng/mL. |
| VOL.56 NO.6 (2009/12) |
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FULL PAPER |
PDF file Download: JCCS_V56_6_1139-1146.pdf
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| Differential Pulse Polarographic Determination of Cd(II) and Pb(II) in Milk
Samples after Solid-phase Extraction Using Amberlite XAD-2 Resin
Modified with 2,2-DPED3P |
| N. Y. Sreedhar,* P. Reddy Prasad, M. Sankara Nayak, D. Rekha and C. Nageswara Reddy |
| In the present paper, solid phase extraction procedure was developed for the determination of Cd(II) and Pb(II) in cows’, goats’, ewes’, buffalos’ and humans’ milk samples using newly synthesized reagent 2,2'-DPED3P (2,2'-{[1,2-diphenylethane-1,2-diylidene]dinitrilo}diphenol) for preconcentration and separation prior to differential pulse polarography using amberlite XAD-2 in the ranges of pH 4.0-5.0. The sorbed elements were subsequently eluted with 10mL of 2 M HCl elutes were analysed by differential pulse polarography. Effects of various instrumental parameters are investigated and received conditions are optimized. |
| VOL.56 NO.6 (2009/12) |
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FULL PAPER |
PDF file Download: JCCS_V56_6_1128-1138.pdf
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| Carbon Nanotubes Coated Fiber for Solid-phase Microextraction of
Bovine Fibrinogen and Bovine Serum Albumin |
| Ping-Ping Tang, Ji-Bao Cai* and Qing-De Su |
| Solid-phase microextraction (SPME) fibers were coated with single-wall nanotubes (SWNTs) and multi-wall nanotubes (MWNTs) to study their adsorption and extraction ability of proteins. The fibers coated with CNTs had advantages over traditional SPME fibers in selectivity and sensitivity. The results show that the selectivity, sensitivity and reproducibility of this method are good for real sample analysis. |
| VOL.56 NO.6 (2009/12) |
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FULL PAPER |
PDF file Download: JCCS_V56_6_1118-1127.pdf
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| Photocatalytic Degradation of Ethyl tert-Butyl Ether in Aqueous Solution
Mediated by TiO2 Suspensions: Parameter and Reaction Pathway Investigations |
| Chung-Shin Lu* and Tien-Yu Chiang |
| Degradation of ethyl tert-butyl ether with UV/TiO2 was studied by solid-phase microextraction and gas chromatography-mass spectrometry. Eight intermediates have been identified by searching the mass spectra library, giving insight into the early steps of the degradation process. Results suggest that possible transformation pathways may include hydrogen abstraction and oxidation reactions. |
| VOL.56 NO.6 (2009/12) |
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FULL PAPER |
PDF file Download: JCCS_V56_6_1112-1117.pdf
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| Effect of Li2O Addition on the Preparation of (Y2-yLiy)Ti2O7-y |
| Wen-Ping Su, Yu-Hsuen Lee, Ching-Tien Hsieh, Hwo-Shuenn Sheu, Jyh-Fu Leeb,
Yong-Ping Chiang and H.-C. I. Kao* |
| SEM images (x2000) of (Y2-yLiy)Ti2O7-y with y = 0.06, using the nominal compositions of the Li2O as (a) 1y, and (b) 3y, prepared by the same procedures. In (a), granular particles with different sizes appeared; however, in (b) particles melted and the size distribution is uniform. The extra Li2O, 2y, in the latter behaves as a flux to lower the melting point of (Y2-yLiy)Ti2O7-y. |
| VOL.56 NO.6 (2009/12) |
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FULL PAPER |
PDF file Download: JCCS_V56_6_1108-1111.pdf
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| Synthesis and Structure Analysis of Aurivillius Phases
Pb1-xBi4+xTi4-xMnxO15 |
| Zulhadjri, B. Prijamboedi, A. A. Nugrohob and Ismunandara* |
| Pb1-xBi4+xTi4-xMnxO15 compounds with composition 0x0.6 were synthesized by molten salts method using eutectic mixture of Na2SO4/K2SO4 salts (1:1 molar ratio) as the flux. The refinement of X-ray powder diffraction data by LeBail method revealed that these compounds belong to the Aurivillius phase with the space group A21am. |
| VOL.56 NO.6 (2009/12) |
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