中国化学快报

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Preparation of 4-and 6-desphenyl analogues of (-)-clausenamide and alternative synthesis of (+)-epi-clausenamide

Jian Jun Xue, Yu Mei Zhou, Xiao Ming Yu

中国化学快报. 2011, 22(11): 1261-1264. https://doi.org/10.1016/j.cclet.2011.07.002

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4-and 6-desphenyl analogues of (-)-clausenamide, 6 and 7, were prepared in optical active form from commercially available D-pyroglutamic acid and the known racemic pyrrolidinone 13, respectively. In order to confirm the absolute stereochemistry of (+)-and (-)-7, intermediate 19b was transferred into the (+)-epi-clausenamide 8.

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The first catalytic asymmetric addition of diethylzinc to aldehyde promoted by chiral thiourea

Zhi Guo Qiao, Tian Hua Shen, Zhen Fang Fu, Jun Qi Li, Hong Wang, Qing Bao Song

中国化学快报. 2011, 22(11): 1265-1268. https://doi.org/10.1016/j.cclet.2011.07.015

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A series of C₂-symmetric and asymmetric chiral thiourea derivatives were synthesized from commercial L-phenylalanine. All of the new compounds have been fully characterized by IR, ¹H NMR, ¹³C NMR, MS spectra and elemental analyses. The chiral thioureas were used as chiral ligands in the catalytic enantioselective ethylation of aldehydes with diethylzinc, the corresponding sec-alcohols were gained with excellent enantioselectivities (up to 87.1% ee) and high yields (up to 76.7%) after the conditions were optimized.

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Synthesis of novel chiral N, P-containing multidentate ligands and their applications in asymmetric transfer hydrogenation

Shen Luan Yu, Yan Yun Li, Zhen Rong Dong, Juan Ni Zhang, Qi Li, Jing Xing Gao

中国化学快报. 2011, 22(11): 1269-1272. https://doi.org/10.1016/j.cclet.2011.05.033

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Novel chiral PN₄-type multidentate aminophosphine ligands have been successfully synthesized by Schiff-base condensation of bis (o-formylphenyl)phenylphosphane and various chiral amino-sulfonamides. Their structures were fully characterized by IR, EI-MS and NMR. The catalytic systems, prepared in situ from the multidentate ligands and iridium (I) complexes, showed high activity in asymmetric transfer hydrogenation of propiophenone in 2-propanol solution, leading to corresponding optical alcohol with up to 75% ee.

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Mild, convenient and efficient synthesis of novel 2,2-dichloro-1,3-diarylaziridines from Schiff bases by phase transfer CTAB catalysis under low concentration alkaline conditions

Hossein Naeimi, Khadijeh Rabiei

中国化学快报. 2011, 22(11): 1273-1276. https://doi.org/10.1016/j.cclet.2011.05.027

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A mild and efficient method for preparation of novel 2, 2-dichloro-1, 3-diarylaziridines from Schiff base compounds in the presence of N-cetyl-N, N, N-trimethyl ammonium bromide (CTAB) as phase transfer catalyst has been described. The reaction is dramatically enhanced in the presence of quaternary ammonium salt. The corresponding products have been obtained in excellent yields, high purity and short reaction times.

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Synthesis and cytotoxic activity of 2,5-disubstituted pyrimido[5,4-c] quinoline derivatives

Fan Zhang, Xin Zhai, Li Juan Chen, Jian Guo Qi, Bo Cui, Yu Cheng Gu, Ping Gong

中国化学快报. 2011, 22(11): 1277-1280. https://doi.org/10.1016/j.cclet.2011.05.030

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A series of 2, 5-disubstituted pyrimido[5, 4-c]quinoline derivatives were synthesized and their cytotoxic activity against H460, HT-29 and MDA-MB-231 cell lines was evaluated in vitro. It was found that most of the tested compounds especially compound 17, shown stronger activity to the selected three cell lines than ZM447439.

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Highly regioselective synthesis of dicyano-8a, 10,11-trihydropyrrolo[1,2-a] [1,10]phenanthrolines via a domino-Knoevenagel-cyclization

Reza heydari, Batool Tahamipour

中国化学快报. 2011, 22(11): 1281-1284. https://doi.org/10.1016/j.cclet.2011.05.035

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1, 10-Phenanthrolinium N-ylides, can react with malonitrile and aromatic aldehydes via a domino-Knoevenagel cyclization to afford a new class of mhydropyrrolo[l, 2-a] [l, 10]phenanthroline derivatives as stable helical compounds in a simple, mild, and efficient protocol in excellent yields.

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Highly active bifunctional salenTi(IV) catalysts for asymmetric cyanosilylation of aldehydes and TMSCN

Ye Qian Wen, Wei Min Ren, Xiao Bing Lu

中国化学快报. 2011, 22(11): 1285-1288. https://doi.org/10.1016/j.cclet.2011.06.016

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A novel enantiopure salen ligand bearing a diphenylphosphine oxide on the 3-position of one aromatic ring was synthesized and combined with Ti (Oi-Pr)₄ as a monometallic bifunctional catalyst for asymmetric cyanosilylation reaction of aldehydes with trimethylsilyl cyanide (TMSCN). The catalyst system exhibited excellent activity and moderate enantioselectivity. The addition of TMSCN to 4-nitrobenzaldehyde in the presence of 1 mol% catalyst loading could complete within 10 min at ambient temperature. An intramolecularly cooperative catalysis was observed in this system wherein the central metal Ti (IV) is suggested to play a role of Lewis acid to activate aldehydes while the appended diphenylphosphine oxide worked as Lewis base to activate TMSCN.

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Synthesis of vegetable oil based polyol with cottonseed oil and sorbitol derived from natural source

Lian Kun Jia, Li Xiang Gong, Wen Jiao Ji, Cheng You Kan

中国化学快报. 2011, 22(11): 1289-1292. https://doi.org/10.1016/j.cclet.2011.05.043

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In order to prepare the polyol with all bio-based components as raw materials, cottonseed oil was first epoxidized by peroxyformic acid generated in situ from hydrogen peroxide and formic acid, and the cottonseed oil based polyols with variable hydroxyl value were then prepared by the ring-opening of epoxidized cottonseed oil with sorbitol, which is a multi-functional hydroxyl compound derived from a natural source. The chemical structure of the products was characterized with FTIR analysis, and the residual epoxy oxygen content and hydroxyl value of the polyol versus the ring-opening time were investigated.

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Synthesis, antimicrobial evaluation and QSAR studies of 3-ethoxy-4-hydroxybenzylidene/4-nitrobenzylidene hydrazides

Davinder Kumar, Archana Kapoor, Ananda Thangadurai, Pradeep Kumar, Balasubramanian Narasimhan

中国化学快报. 2011, 22(11): 1293-1296. https://doi.org/10.1016/j.cclet.2011.06.014

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A series of 3-ethoxy-4-hydroxybenzylidene/4-nitrobenzylidene hydrazides (1-20) was synthesized and tested for in vitro antimicrobial activity. The results of antimicrobial studies indicated that the compounds having dinitro, methoxy, hydroxy and nitro substituents on phenyl ring of the aromatic acids were most active ones. The QSAR investigation indicated the importance of the topological parameter, third order molecular connectivity index (³χ) in describing the antimicrobial activity of synthesized hydrazides.

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Synthesis and biological study of novel 5-{(4-(6,7-dihydrothieno-[3,2-c]pyridin-5(4H)-ylsulfonyl)phenylamino)-methyl}-quinolin-8-ol and its metal complexes

Paresh N. Patel, Khyati D. Patel, Hasmukh S. Patel

中国化学快报. 2011, 22(11): 1297-1230. https://doi.org/10.1016/j.cclet.2011.05.042

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A novel 5-( (4-(6, 7-dihydrothieno[3, 2-c]pyridin-5 (4H)-ylsulfonyl)phenylamino)methyl)quinolin-8-ol (HTPSMQol) was synthesized by optimized reaction of 4-(6, 7-dihydrothieno[3, 2-c]pyridin-5 (4H)-ylsulfonyl)aniline with 5-chloromethyI-8-hydroxy_quinoline hydrochloride (CMHQ). Also complexes of HTPSMQol were prepared by using various M (Ⅱ) metal salts. All compounds were analyzed by spectroscopic techniques and screened against various strains of microorganisms. The results showed higher antimicrobial activity of HTPSMQol compared to its metal complexes and comparable with Ciprofloxacin.

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Synthesis and properties of a novel squaraine dye modified by ferrocene

Yang Wei Huang, Nan Yan Fu

中国化学快报. 2011, 22(11): 1301-1304. https://doi.org/10.1016/j.cclet.2011.05.039

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A novel squaraine dye (SQ) modified by ferrocene has been synthesized through (E)-l-dodecyl-2-ferrocenyl vinyl-1H-pyrrole and squaric acid. The molecular structure of SQ was characterized by ¹H NMR, ¹³C NMR, MS and elemental analysis. SQ is high soluble in common solvents. The maximum absorptions of SQ in different solvents are in the range of 708-734 nm, exhibiting positive solvatochromism with increasing solvent polarity. The optical and electrical properties of SQ indicate that it is a promising electron donor material for bulk-heterojunction organic solar cell.

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Surfactant-assisted synthesis of bis(indolyl)methanes in water

Eskandar Kolvari, Mohammad Ali Zolfigol, Hoda Banary

中国化学快报. 2011, 22(11): 1305-1308. https://doi.org/10.1016/j.cclet.2011.07.004

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An environmentally friendly synthesis method for bis (indolyl)methanes has been developed in the presence of sodium lauryl ether sulfate (SLES), electrophilic substitution reactions of indoles with aldehydes were accomplished in water as solvent at room temperature without any Bronested or Lewis acid catalysts.

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Synthesis and preliminary biological evaluation of a technetium-99m labeled thymidine analog

Chun Xiong Lu, Zheng Wu Wang, Quan Fu Jiang, Jie Tang, Cheng Tan, Jian Kang Zhang

中国化学快报. 2011, 22(11): 1309-1312. https://doi.org/10.1016/j.cclet.2011.06.012

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The synthesis and labeling of ^99mTc-N³-{N'-[2-sulfanyl-ethylamino)acetyl]-2-aminoethyl-sulfanyl-l-hexanamide}thymidine (^99mTc-NHT) were studied. In the presence of sodium glucoheptonate (GH) and ethylene diamine tetraacetic acid (EDTA), ^99mTc-NHT was obtained by using bisaminoethanethiol (N₂S₂) as a bifunctional coupling agent. The radiochemical purity of the ^99mTc-NHT was over 95%. Biodistribution of ^99mTc-NHT was performed in hepatoma HepA tumor-bearing mice. At 2 h p. i., the ratios of tumor-to-muscle, tumor-to-bone and tumor-to-blood were 4.41±0.32, 2.45±0.24 and 1.51±0.18, respectively.

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Melamine-formaldehyde resin supported H⁺:A mild and inexpensive reagent for synthesis of coumarins under mild conditions

Ramin Rezaei, Leila Dorosty, Maryam Rajabzadeh, Reza Khalifeh

中国化学快报. 2011, 22(11): 1313-1316. https://doi.org/10.1016/j.cclet.2011.06.009

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Melamine-formaldehyde resin supported H⁺ is used as an efficient catalyst in the Pechmann condensation reaction of phenols with β-ketoesters, in solvent-free media leading to the formation of coumarin derivatives using conventional heating and microwave irradiation in excellent yields with good purity.

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Sulfamic acid as a reusable and green catalyst for efficient and simple synthesis of 2-substituted-2,3-dihydroquinazolin-4(1H)-ones in water or methanol

Amin Rostami, Ashkan Tavakoli

中国化学快报. 2011, 22(11): 1317-1320. https://doi.org/10.1016/j.cclet.2011.06.008

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A series of 2, 3-dihydroquinazolin-4 (1H)-ones have been synthesized in good to excellent yields through direct cyclocondensa-tion of anthranilamide and aryl aldehydes or ketones in water or methanol under mild conditions. The reaction was efficiently promoted by 10 mol% sulfamic acid (SA, H₂NSO₃H) and the catalyst could be recovered easily after the reactions and reused without evident loss of reactivity.

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Performance of Mo-V-Te-P catalysts supported on the SiC for propane selective oxidation to acrolein

Yang Wang, Fei Ma, Shu Chen, Fang Chen, Wei Min Lu

中国化学快报. 2011, 22(11): 1321-1325. https://doi.org/10.1016/j.cclet.2011.06.015

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A series of MoTe_0.15V_0.1P_xO_n catalysts supported on the SiC were prepared by incipient wetness impregnation. The addition of P to MoTe_0.15V_0.1O_n/SiC catalysts improved the catalytic performance of selective oxidation from propane to acrolein (ACR), and the catalyst showed highest selectivity (33.7%) and yield (10.7%) when x=0.05. The MoTe_0.15V_0.1P_xO_n/SiC catalysts have been characterized by XRD, H₂-TPR, Raman, XPS and NH₃-TPD. The results indicated that a little H₃PMo₁₂O₄₀ heteropoly acid and (VO)₂P₂O₇ formed and MoO₃ phase lessened after addition of P. The addition of P promoted the active species dispersed, increased the acidity on the surface, as well as might make the redox process easier. These significant differences improved the activity and selectivity of ACR.

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Synthesis and characterization of novel conjugated polymers based on 3-cyclobutene-l,2-dione moiety

Er Fu Huo, Yong Zou, Hui Qin Sun, Yan Huang, Zhi Yun Lu, Qing Jiang

中国化学快报. 2011, 22(11): 1326-1330. https://doi.org/10.1016/j.cclet.2011.05.025

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Three novel conjugated polymers bearing 3, 4-bis (4-hexylthiophen-2-yl)-3-cyclobutene-l, 2-dione unit in their main chain have been synthesized successfully in good yields through Suzuki or Stille coupling reaction. Their molecular structures have been confirmed by FT-IR, ¹H NMR and ¹³C NMR. All these copolymers exhibit broad and strong absorption bands in UV-vis region, and their optical band gaps are calculated to be 1.6-2.0 eV, suggesting that they have good coverage with the solar spectrum. These polymers have good thermostability and solubility in common organic solvents. Moreover, all these objective macromolecules possess high electron affinity of~3.8 eV determined from cyclic voltammetry measurement, implying that they are potential n-type polymeric photovoltaic materials.

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Phenolic compounds from the aqueous extract of Acacia catechu

Xing Cui Li, Li Xin Yang, Hong Qing Wang, Ruo Yun Chen

中国化学快报. 2011, 22(11): 1331-1334. https://doi.org/10.1016/j.cclet.2011.07.014

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From the aqueous extract of Acacia catechu, two new phenolic compounds (3R, 4R)-3-(3, 4-dihydroxyphenyl)-4-hydroxycy-clohexanone (1) and (4R)-5-(l-(3, 4-dihydrophenyl)-3-oxoburyl)-dihydrofuran-2 (3H)-one (2) were obtained. Their structures were determined on the basis of spectroscopic analysis. Free-radical scavenging activities of them were evaluated.

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Study of spatial distribution for the active ingredient in ibuprofen tablet based on near-infrared micro-imaging technology

Dong Wang, Yun Sheng Ding, Jin Li Cao, Yue He, Sheng Feng Ye, Shun Geng Min

中国化学快报. 2011, 22(11): 1335-1338. https://doi.org/10.1016/j.cclet.2011.07.001

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The NIR micro-images of ibuprofen tablets were collected in this research. Compare correlation imaging and principal component analysis (PCA) with histogram were applied to acquire the spatial distribution of ibuprofen granule. The result indicated that a similar distribution trend can be acquired by both of the two methods mentioned above; the information of PC2 results from ibuprofen mainly since the correlation coefficient between PC2 loading vector and the NIR spectrum of ibuprofen is 0.9930. The result of PCA indicated that the information of PC2 results from ibuprofen mainly for both the low and the high content of ibuprofen in the tablets. The correlation coefficient between the data of the two PC2 loading vectors of the low and the high content of ibuprofen in the tablets is 0.9998, which indicates that the result of PCA is stable and reliable.

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Concave cell design for FTIR measurements

Xiang Qin Lin, Zhi Xiang Zhang, Wan Qun Hu

中国化学快报. 2011, 22(11): 1339-1342. https://doi.org/10.1016/j.cclet.2011.05.038

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Wedged and V-shaped cells have advantages on depressing strong absorption bands and keeping the photo windows wide open without absorption block. Alternatively, this work presents a concave cell design, which is constructed by a plano-convex CaF₂ lens in combination with a flat plate. Mathematical equations have been provided for data treatment with Matlab programs. The result indicates that the concave cell has advantages similar to the V-shaped cell. Reflection-absorption measurements of ethanol have been conducted on the cell in mid-IR region for demonstration. The spectrum obtained from the concave cell can easily be interpreted to regenerate its normal spectrum, which is fitting well with the spectrum taken in a conventional thin-layer cell. The concave cell is easier to construct and more convenient to operate, willing to have popular usages.

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Apolipoprotein B100 analysis in microchip with electrochemical detection

Cheng Cheng Liu, Yun Liu, Hui Xiang Wang, Yan Bo Qi, Peng Yuan Yang, Bao Hong Liu

中国化学快报. 2011, 22(11): 1343-1346. https://doi.org/10.1016/j.cclet.2011.05.028

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Apolipoprotein B100 (apoB-100) is a major protein of the cholesterol-rich low-density lipoprotein (LDL) and reflects a better assessment of total atherogenic burden to the vascular system than LDL. In this work, a simple and sensitive method has been developed to determine picoliter apoB-100s using the PMMA microfluidic chip coupled with electrochemical detection system. This method performs very well with a detectable linear range of 1-800 pg/mL and a detection limit of 1 pg/mL. A real serum sample has further been detected by this microchip-based biosensor. The results show that this kind of method is practicable and has the potential application in clinical analysis and diagnosis.

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Effect of noncovalent complexations on coordination interactions in a tricomponent system of β-cyclodextrin, copper chloride and hexamethylene tetramine

Jing Yang, Le Xin Song, Zheng Dang, Shu Zhen Pan, Fang Yun Du

中国化学快报. 2011, 22(11): 1347-1350. https://doi.org/10.1016/j.cclet.2011.05.029

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This study reveals that the noncovalent complexation between β-CD and Cu (HMTA)²⁺ makes a positive contribution to the coordination interaction between Cu²⁺ and HMTA in a tricomponent system. Besides, mono-and binuclear complexes:[β-CD·Cu]⁺ and[Cu-β-CD·Cu)⁺ were observed under the condition of ESI-MS.

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Molecularly imprinted macroporous monolithic materials for protein recognition

Qi Liang Deng, Yan Li Li, Li Hua Zhang, Yu Kui Zhang

中国化学快报. 2011, 22(11): 1351-1354. https://doi.org/10.1016/j.cclet.2011.05.044

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Synthetic materials that can specifically recognize proteins will find wide application in many fields. In this report, bovine serum albumin was chosen as the template protein. Acrylamide and N, N'-methylenebisacrylamide were employed as the functional and cross-linker monomers, respectively. Molecularly imprinted macroporous monolithic materials that can preferentially bind the template protein in an aqueous environment were prepared by combination of molecular imprinting technique and freezing/thawing preparation method. The resulted imprinted macroporous monolithic columns were evaluated by utilizing as stationary phase in high performance liquid chromatography and solid-phase extraction materials. The experimental results indicated that the imprinted macroporous monolithic column exhibited good recognition for template protein, as compared with the control protein (hemoglobin), whereas the non-imprinted polymer (prepared under the same conditions except without addition template protein) had no selective properties.

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Monotropic smectic A to double layer smectic C transition of biphenyl containing liquid crystal acetylene

Zhen Qiang Yu, Cai Zhen Zhu, Zhe Zhang, Jian Hong Liu, Jacky W. Y. Lam, Ben Zhong Tang

中国化学快报. 2011, 22(11): 1355-1358. https://doi.org/10.1016/j.cclet.2011.06.013

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5-[(4'-Heptoxy-4-biphenylyl)carbonyloxy]-l-pentyne (A-3, 7) was synthesized and the phase structures and transitions were investigated by differential scanning calorimetry (DSC), wide angle X-ray diffraction (WAXD), polarized light microscopy (PLM) and the molecular packing in the crystal and liquid crystalline phases were simulated by molecular dynamic simulation. The results showed that the sample formed thermodynamically metastable SmA and SmC₂ phases before crystallized during cooling and the crystal phase directly transformed into isotropic phase during heating.

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Preparation of TeO_x-SiO₂ film with excellent third-order nonlinear optical properties by electrochemically induced sol-gel method

Qiang Li, Min Gu

中国化学快报. 2011, 22(11): 1359-1362. https://doi.org/10.1016/j.cclet.2011.07.003

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TeO_x-SiO₂ composite films having third-order nonlinearities were prepared by electrochemically induced sol-gel deposition method on ITO substrate. The third-order optical nonlinearities of the films were measured by Z-scan technique. The third-order nonlinear susceptibilities (χ⁽³⁾) of the as-prepared films are 5.9×10^-7 to 4.29×10^-6 esu. The surface morphology and composition of the films were characterized by SEM/EDX, which identified that Te metallic particles well dispersed in TeO_x-SiO₂ gel films.

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Application of Li₂SiO₃ as a heterogeneous catalyst in the production of biodiesel from soybean oil

Jian Xun Wang, Kung Tung Chen, Shiuh Tsuen Huang, Chiing Chang Chen

中国化学快报. 2011, 22(11): 1363-1366. https://doi.org/10.1016/j.cclet.2011.05.041

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Biodiesel was synthesized from soybean oil by transesterification over Li₂SiO₃ catalyst. The Li₂SiO₃ can be used for biodiesel production directly without further drying or thermal pretreatment, no obvious difference in the FAME conversion (92.4-96.7%) between the air-exposed catalyst (24-72 h) and the fresh one (94.2%). This leads to important benefits when considering industrial applications of Li₂SiO₃ as a solid catalyst for storing and handling catalyst without taking special actions.

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Synthesis and nonlinear optical properties of copolymers of fluoro-containing bisphenol A and chromophores

Jie Ping Shi, Hui Yang, Li Wei, Hong Wen Hu, Guo Yuan Lu

中国化学快报. 2011, 22(11): 1367-1370. https://doi.org/10.1016/j.cclet.2011.05.006

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A series of new fluoro-containing copolymers have been synthesized by a Mitsunobu reaction with 4, 4'-(hexafluoro-isopropylidene)bisphenol A (6FBPA) and the corresponding N, N-dihydroxyethylaminoaryl azo or ring-locked triene compounds, which have high thermal stability and good solubility in organic solvents. The nonlinear optical (NLO) measurements made by Marker fringe method at 1064 nm indicate that the copolymers embedded with the ring-locked triene and azo chromophores exhibit higher macroscopic nonlinear optical coefficient (70.2 pm/V and 26.5-34.6 pm/V, respectively). Thermal analysis and UV-visible absorption spectra show that the copolymers have good thermal stability (T_d=264-319℃) and optical transparency (λ_max<500nm).

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Synthesis and characterization of poly[(4-vinylphenyl)dimethyl-silane]-b-polybutadiene-b-poly[(4-vinylphenyl)dimethylsilane](PVPDMS-b-PBd-b-PVPDMS)

Hong Wei Ma, Bai Wang, Chun Qing Zhang, Yang Li, Yan Ming Hu, Yu Rong Wang

中国化学快报. 2011, 22(11): 1371-1374. https://doi.org/10.1016/j.cclet.2011.05.004

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The novel functionalized triblock copolymers, poly[(4-vinylphenyl)dimethylsilane]-b-polybutadiene-b-poly[(4-vinylphenyl)-dimethylsilane] (PVPDMS-b-PBd-b-PVPDMS), were synthesized by anionic polymerization method using high vacuum technique. The hydrocarbon-soluble dilithium initiator synthesized from 1, 3-di[l-(methylphenyl)ethenyl]benzene (MPEB) was used to synthesize polybutadiene (PBd) precursors and the triblock copolymers in the presence of sec-BuOLi. The precursors and copolymers were characterized by size exclusion chromatography (SEC), ¹HNMR and DSC techniques.

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Mesomorphous structure change by tail chain number in ionic liquid crystalline complexes of linear polymer and amphiphiles

Zhi Yu Cheng, Bi Ye Ren, Shu Ying He, Xin Xing Liu, Zhen Tong

中国化学快报. 2011, 22(11): 1375-1378. https://doi.org/10.1016/j.cclet.2011.05.024

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Three polymer-amphiphile complexes were prepared by combining poly (allylamine hydrochloride) (PAH) with the potassium salt of mono-, di-, and trisubstituted benzoic acid dendrons (4-octyloxybenzoic acid, 3, 5-dioctyloxybenzoic acid, and 3, 4, 5-trioctyloxybenzoic acid). The solid structure and properties were monitored with FT-IR, XRD, TG, DSC, and polarized optical microscope (POM). Difference in the tail chain number of the dendritic amphiphile induced two different mesomorphous structures:lamella for the mono-, disubstituted dendron containing complexes and hexagonal column for the trisubstituted dendron containing complexes. These corresponded to the ionic thermotropic liquid crystal SmA and φ_h phases, respectively. This finding is significant for design of functional nanostructures based on the ionic complexation of polymers and amphiphiles.

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A novel scalable synthesis process of PPTA by coupling n-pentane evaporation for polymerization heat removal

Tao Zhang, Guo Hua Luo, Fei Wei, Yan Yan Lu, Wei Zhong Qian, Xin Lin Tuo

中国化学快报. 2011, 22(11): 1379-1382. https://doi.org/10.1016/j.cclet.2011.05.037

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In this study, we compared the effect of n-pentane and ice-water bath on removing the thermal effect in the poly (p-phenylene terephthalamide) (PPTA) polymerization process. The results indicate that the n-pentane can help to transfer the reaction heat faster and better. Adding suitable amount of n-pentanes into the PPTA preparation process not only improve the heat transfer, but also reduce the motor power in the polymerization process. Moreover, the introduction of n-pentane properly does not result in decrease of the inherent viscosity (η_inh) of polymer. Instead, it leads to increased viscosity of polymer during the PPTA preparation process. The results indicate that n-pentane can effectively transfer the reaction heat and avoid overheating during the polymerization of PPTA.

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The effect of diphenylamine on the electronic, optical, and charge transport properties of BTD-based derivative:Insights from theory

Bo Hu, Chan Yao, Qing Wei Wang, Xu Ri Huang

中国化学快报. 2011, 22(11): 1383-1386. https://doi.org/10.1016/j.cclet.2011.04.017

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Theoretical investigations have been performed to explore the variation in electronic, optical, and charge transport properties upon the change of the chemical composition along the backbone in 2, 1, 3-benzothiadiazole (BTD)-based derivative. Narrow difference between hole and electron transportations with the charge hopping model indicates studied BTD-based derivative can be used as good ambipolar transport material in organic light-emitting diodes.

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2011年, 第22卷, 第11期　刊出日期：2011-11-20

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2011年, 第22卷, 第11期 刊出日期：2011-11-20

2011年, 第22卷, 第11期　刊出日期：2011-11-20