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권호별목차 / 소장처보기

H : 소장처정보

T : 목차정보

Chinese chemical letters = 中國化學快報 64건

  1. [해외논문]   Synthesis of novel β-propanamides to inhibit cholesteryl ester transfer protein (CETP)  

    Xie, H.L. ; Liu, C.C. ; Li, Y.Q. ; Bai, C.L. ; Hao, C.Z. ; Guo, J. ; Luo, C.Q. ; Zhao, D.M. ; Cheng, M.S.
    Chinese chemical letters = 中國化學快報 v.28 no.2 ,pp. 260 - 263 , 2017 , 1001-8417 ,

    초록

    A novel series of β-propanamide derivatives as inhibitors of cholesteryl ester transfer protein (CETP) were synthesized. Previously, H3 (IC 50 2μmol/L) was observed to inhibit CETP moderately (Xie et al., 2016). Structural modifications based on H3 led to discovery of the successful CETP inhibitor, known as 1-methyl-4-arylpyrazole. Using a similar approach, compound Q08 was identified as a highly potent CETP inhibitor with an IC 50 of 490nmol/L in vitro.

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  2. [해외논문]   Synthesis of newly cationic surfactant based on dimethylaminopropyl amine and their silver nanoparticles: Characterization; surface activity and biological activity  

    Shaban, S.M. ; Aiad, I. ; El-Sukkary, M.M. ; Soliman, E.A. ; El-Awady, M.Y.
    Chinese chemical letters = 中國化學快報 v.28 no.2 ,pp. 264 - 273 , 2017 , 1001-8417 ,

    초록

    The chemical structure of newly synthesized cationic surfactants based on Schiff base was confirmed using Fourier transform infrared spectroscopy, proton nuclear magnetic resonance spectroscopy, and mass spectroscopy. The synthesized surfactants were used in the synthesis of silver nanoparticles by a simple one-step method. The silver nanoparticle (AgNPs) formation was confirmed using transmission electron microscopy (TEM), electron diffraction (SAED), dynamic light scattering (DLS), and energy dispersive X-ray spectroscopy (EDX). The structure of the surfactant played an important role in the synthesis process. Increasing the hydrophobic chain length, the stability, and the amount of surfactant increased the quantity of AgNPs formed. The surface activity of the synthesized cationic surfactants was determined using surface tension measurements at three different temperatures. The synthesized surfactants showed a high tendency toward adsorption and micellization. Increasing the hydrophobic chain length of the synthesized surfactant increased its adsorption. Screening the synthesized cationic surfactants and their nano-form against bacteria and fungi showed that they are highly effective. The silver nanoparticles enhanced the biological activity of the synthesized cationic surfactants.

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  3. [해외논문]   Synthesis, characterization and antioxidant activities of highly functionalized cyclopentadienes catalyzed by ZnO-nanorod as economic and efficient heterogeneous nano catalyst  

    Sajjadi-Ghotbabadi, H. ; Javanshir, S. ; Rostami-Charati, F.
    Chinese chemical letters = 中國化學快報 v.28 no.2 ,pp. 274 - 279 , 2017 , 1001-8417 ,

    초록

    A three-component condensation was applied for the preparation of cyclopentadiene derivatives through the reaction of primary amines, alkyl propiolate and dialkyl acetylenedicarboxylate in the presence of catalytic amount of ZnO-nanorods (Zn-NR) under solvent-free conditions at 50 o C. The method has proved to be synthetically green, simple, and effective with high atom economy and yield. The catalyst also revealed significant reusability. Moreover, the antioxidant activity and free radical scavenging capacity of the newly synthesized derivatives 4a, 4b, 4c, and 4d was screened using free radical scavenging 2,2-diphenyl-1-picrylhydrazyl (DPPH) and ferric reducing antioxidant power (FRAP) assays and compared with hydroxytoluene (BHT) and tert-butylhydroquinone (TBHQ). These compounds do not exhibit good DPPH radical scavenging, but they have a desirable FRAP.

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  4. [해외논문]   Preparation and photochromic properties of pyrazolones/polyvinyl alcohol composite films  

    Guo, J.X. ; Guo, M.X. ; Jia, D.Z. ; Li, Y.H.
    Chinese chemical letters = 中國化學快報 v.28 no.2 ,pp. 280 - 284 , 2017 , 1001-8417 ,

    초록

    Novel photochromic composite films have been successfully fabricated by dispersing pyrazolone derivative: 1,3-Diphenyl-4-(3-chlorobenzal)-5-hydroxypyrazole 4-phenylsemicarbazone (1a) into hydrosol of polyvinyl alcohol (PVA). The microstructure, photochromic behaviors and thermal bleaching properties were investigated by Raman spectroscopy, X-ray powder diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and ultraviolet-visible absorption spectroscopy (UV-vis). The results showed that 1a was not only blended but also well dispersed in the PVA polymer films with a suitable content of chromophore. Upon UV light irradiation, the composite films gradually changed from colorless to yellow and recovered fully to the initial state upon thermal bleaching. The time constants of photochromic reactions were almost the same as those of 1a observed in their crystalline state, indicating that the photochromic phenomenon is barely disturbed by the polymer matrix.

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    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  5. [해외논문]   Novel organic dye sensitizers containing fluorenyl and biphenyl moieties for solar cells  

    Xie, Y. ; Han, L. ; Ge, C.S. ; Cui, Y.H. ; Gao, J.R.
    Chinese chemical letters = 中國化學快報 v.28 no.2 ,pp. 285 - 292 , 2017 , 1001-8417 ,

    초록

    Three novel triarylamine dyes (AFL1-AFL3) containing fluorenyl and the biphenyl moieties have been designed and synthesized for application in dye-sensitized solar cells. The light-harvesting capabilities and photovoltaic performance of these dyes were investigated systematically through comparison of different π-bridges. The dye with a furan linker exhibited a higher open-circuit voltage (V OC ) and monochromatic incident photon-to-current conversion efficiency (IPCE) compared to thiophene and benzene linker. Thus, AFL3 containing a furan linker exhibited the maximum overall conversion efficiency of 5.81% (V OC =7 760mV,J SC =1 11.36mAcm -2 and ff=0.68) under standard global AM 1.5 G solar condition.

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    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  6. [해외논문]   Hydrogenation of cinnamaldehyde over bimetallic Au-Cu/CeO2 catalyst under a mild condition  

    Liao, X.M. ; Pitchon, V. ; Cuong, P.H. ; Chu, W. ; Caps, V.
    Chinese chemical letters = 中國化學快報 v.28 no.2 ,pp. 293 - 296 , 2017 , 1001-8417 ,

    초록

    Bimetallic Au x Cu y /CeO 2 (x/y=3/1, 1/1, and 1/3) catalysts were prepared by direct anion exchange (DAE), following impregnation (IMP) methods, and used for selective hydrogenation of cinnamaldehyde. The effects of pretreatments, such as calcination or reduction on the catalytic activities of these catalysts were investigated. XRD and HRTEM showed that for the reduced catalysts, there is the formation of an Au-Cu alloy. HAADF-STEM displayed that reduction pretreatment leads to a very homogenous distribution of Au and Cu on the external catalyst surface. Reaction parameters, such as CAL concentration, the stirring speed, nature of the solvent influence the catalytic activities. Pretreatments lead to a major effect on CAL conversion and HCAL selectivity. Catalysts Au x Cu y /CeO 2 pretreated under reduction display higher CAL conversion and HCAL selectivity than that of under calcination mainly due to the synergistic effect resulting in a formation of Au-Cu alloy.

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    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  7. [해외논문]   Synthesis, characterization, and phase transition of an inorganic-organic hybrid compound, [(3-nitroanilinium+)(18-crown-6)][IO4-](CH3OH)  

    Liu, Z.Q. ; Liu, Y. ; Chen, Y. ; Zhao, W.Q. ; Fang, W.N.
    Chinese chemical letters = 中國化學快報 v.28 no.2 ,pp. 297 - 301 , 2017 , 1001-8417 ,

    초록

    A novel inorganic-organic hybrid supramolecular compound, [(3-nitroanilinium + )(18-crown-6)][IO 4 - ](CH 3 OH) (1), was discovered as phase-transition materials displaying dielectric anomalous behaviors. The yellow block crystal formed by N-H...O hydrogen bonding that made contact through the cavity of 18-crown-6 was characterized by single-crystal X-ray diffraction, elemental analysis, infrared analysis, thermogravimetric analysis, differential scanning calorimetry, and potential-energy calculations. Differential scanning calorimetry measurements indicate that the compound experiences a reversible phase transition at around 220K. Temperature-dependent dielectric measurements further confirm the phase transitions. Potential-energy calculations demonstrate that the phase transition occurs due to the molecular order-disorder rotation of CH 3 OH, whereas the space grouping of the crystal remains unchanged.

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  8. [해외논문]   Decoration of CNTs' surface by Fe3O4 nanoparticles: Influence of ultrasonication time on the magnetic and structural properties  

    Yu, R. ; Jiang, C.F. ; Chu, W. ; Ran, M.F. ; Sun, W.J.
    Chinese chemical letters = 中國化學快報 v.28 no.2 ,pp. 302 - 306 , 2017 , 1001-8417 ,

    초록

    The decoration of CNTs surface by magnetic nanoparticles was achieved by an ultrasonication-assisted hydrothermal method (UAHM). The effect of ultrasonication time on the crystal structure, magnetic performance, and chemical composition of the magnetic CNT composite material was determined. X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), and vibrating sample magnetometry were used to characterize the physical, chemical, and magnetic properties of the composites. The composites synthesized via the UAHM exhibited superparamagnetic properties. The ultrasonication time was a critical factor that affected the structure and magnetic performance of the composites. By simply controlling the ultrasonication time, the crystal phase structure of Fe oxide could be selectively modulated and the magnetic performance of the MCs could be effectively tuned.

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    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  9. [해외논문]   Supported bimetallic catalyst Pt-Pb/SiO2 for selective conversion of nitrobenzene to p-aminophenol in pressurized CO2/H2O system  

    Zhang, T.T. ; Jiang, J.Y. ; Wang, Y.H.
    Chinese chemical letters = 中國化學快報 v.28 no.2 ,pp. 307 - 311 , 2017 , 1001-8417 ,

    초록

    Various supported Pt-Pb bimetallic catalysts were prepared and applied for the catalytic conversion of nitrobenzene to p-aminophenol in the environmentally benign pressurized CO 2 /H 2 O system. Among the bimetallic catalysts prepared, Pt-Pb/SiO 2 is the best and nitrobenzene could be converted to p-aminophenol with a selectivity as high as 82% when the reaction was carried out using this catalyst at 110 o C under 5MPa CO 2 and 0.2MPa H 2 .

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  10. [해외논문]   Scrupulous recognition of biologically important acids by fluorescent ''turn off-on'' mechanism of thaicalix reduced silver nanoparticles  

    Darjee, S.M. ; Bhatt, K.D. ; Panchal, U.S. ; Jain, V.K.
    Chinese chemical letters = 中國化學快報 v.28 no.2 ,pp. 312 - 318 , 2017 , 1001-8417 ,

    초록

    Water dispersible silver nanoparticles (AgNps) were prepared using thiacalix[4]arene tetrahydrazide (TCTH) as a reducing and stabilizing agent. TCTH-AgNps were characterized by surface plasmon resonance (SPR), transmission electron microscopy (TEM) and energy dispersive X-ray (EDX). Relatively uniform 20nm spherical particles of TCTH-AgNps were efficiently formed over a pH range of 5-9 and from 10-40 o C. The interaction behavior of TCTH-AgNps with different amino acids was investigated using spectrophotometry and spectrofluorimetry. Among the amino acids tested, only tryptophan and histidine showed fluorescence quenching and fluorescence enhancement, respectively. The linear detection range by Stern-Volmer plot was 5nmol/L to 0.48μmol/L for tryptophan and 4nmol/L to 0.54μmol/L for histidine. TCTH-AgNps were able to effectively reduce the levels of gram-positive bacteria, gram-negative bacteria, and fungi. These properties argue for the potential use of TCTH-AgNps as detectors of histidine and tryptophan and as antibiotics.

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