MOLECULAR CRYSTALS AND LIQUID CRYSTALS
·
2017
·
IF 0.571
Anna Ruan,Hongyu Guo,Chuang Yang,Fafu Yang
Series of cyclotriveratrylene (CTV) derivatives with triazole ring and three alkyl groups were prepared by one-pot click condensation in yield of 80–88%. The structures and crown conformations were confirmed by NMR and MS. Their liquid crystalline properties were investigated by DSC, POM and XRD analysis. The studies on mesomorphic properties suggested that the CTV derivatives with pentyl, hexyl or dodecyl groups show no mesophase but the one with octadecyl groups possesses ordered hexagonal columnar mesophase. In comparison with the reported columnar CTV liquid crystals with six alkyl chains at least, the CTV columnar CTV liquid crystal with three alkyl chains was reported for the first time. These results suggested a subtle balance between the number and length of alkyl chains for columnar CTV liquid crystalline behavior.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Tingyu Chen,Huiju Huang,Lifang Liu,Jun Fang,Yang Yang
Copolymerization of conjugated nitrogen heterocycles within carbon nitride nowadays is proven to be a successful strategy to promote charge separation. Here, a novel edge-grafted carbon nitride nanosheets by triazole rings were synthesized from the copolymerization of dicyandiamide and 3-amino-1, 2, 4-triazole via microwave-assisted heating with improved yield. Based on the building of a feasible donor-acceptor (D-A) system by such edge grafting, the rapid charge transfer pathways were formed. Benefiting from the thin-layer structure of carbon nitride via microwave-assisted heating and abundant π electrons by intramolecular doping, the system showed enhanced visible light absorption from n-π∗ electrons transition , facile charge separation and transfer, and then an increased H 2 evolution rate (637.58 μmol h −1 g −1 ), which is 17.43 times than the triazole modified sample from conventional thermal condensation method. This work enlightens an innovative pathway for the regulation of carbon nitride photocatalysts by conjugated nitrogen heterocycles for efficient solar energy conversion applications.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Yufeng Liang,Ziqiang Liu,Kejing Lin,Weimin Yin,Yuanqin Zhu
Aromatic hydrocarbon proton exchange membranes (PEMs) hold promises as alternatives to Nafion membranes. Here we report on the design and preparation of graft-type PEMs based on poly ( m -terphenyl fluorenyl)s (TSPHFTP-x) with a featured structure of rigid all-carbon aromatic backbones and long flexible side chains with dual 1,2,3-triazole and disulfonated units. Benefiting from the well-designed structure, the TSPHFTP-x membranes exhibit a well-defined bicontinuous microphase separation structure, thus achieving high proton conductivities up to 175.6 mS cm −1 (25 °C) and 303.0 mS cm −1 (80 °C) under 100 % relative humidity, and excellent dimensional stability with swelling ratio below 24 %. Meanwhile, these membranes show good oxidative stability and mechanical properties. In addition, the H 2 –O 2 fuel cell assembled with the TSPHFTP-50 PEM shows a peak power density of 1013 mW cm −2 at 60 °C. This study provides a valuable insight into the design of polymer architectures for high-performance hydrocarbon PEMs.
研究领域:
材料科学
·
化学工程
·
能源技术
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2018
·Vol. 19
·期 10
·3184
·
IF 3.687
Zhiwen Qi,Chengzhang Wang,Jianxin Jiang,Caie Wu
A series of novel C15 urushiol derivatives were designed by introducing a pechmann structure and F-, Cl-, and Br-nitro substituents with different electronic properties into its alkyl side chain, as well as a triazolyl functional group in its aromatic oxide. Their chemical structures were determined based on the analysis of the NMR (nuclear magnetic resonance) spectroscopic and mass spectrometric data. The results showed that compound4exhibited a strong inhibition of the HepG2 cell proliferation (half maximal inhibitory concentration (IC50): 2.833 μM to human hepatocellular carcinoma (HepG2), and 80.905 μM to human normal hepatocytes (LO2)). Furthermore, it had an excellent synergistic effect with levopimaric acid. The nitrogen atom of the triazole ring formed a hydrogen-bonding interaction with Gly103, Gly154, and Tyr308, which made compound4bind to histone deacetylase (HDAC)2 more tightly. One triazole ring and His33 formed a π–π stacking effect; the other, whose branches were deep into the pocket, further enhanced the interaction with HDAC2. Meanwhile, compound4involved a hydrophobic interaction with the residues Phe210 and Leu276. The hydrophobic interaction and π–π stacking provided powerful van der Waals forces for the compounds.Keywords:urushiol;triazole;diels-alder;pechmann;anti-tumor;HDAC2
研究领域:
药理学
·
肿瘤学
·
分子生物学
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产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2015
·Vol. 183
·期 1
·441-448
·
IF 3.741
Cao Gen-Xia,Wu Xiu-Ming,Dong Yu-Ming,Li Zai-Jun,Wang Guang-Li
We describe a colorimetric assay for the quantitation of melamine (MA). It relies on the observation that MA reverses the inhibition of the light-triggered activity of horseradish peroxidase (HRP) functionalized gold nanoclusters (HRP-Au NCs) by Hg(II) ions. The HRP-Au NCs catalyze the oxidation of the substrate 3,3’,5,5’-tetramethylbenzidine (TMB) by dissolved oxygen if exposed to visible light provided by a 300 W Xe lamp (λ ≥ 400 nm). The addition of Hg(II) suppresses the enzymatic activity due to the metallophilic interaction between Hg(II) and Au(I) present on the surface of the HRP-Au NCs. MA with its triazole ring can restore the catalytic activity of the HRP-Au NCs by inhibiting the metallophilic interaction. As a result of these findings, a colorimetric “turn-on” assay for MA was worked out that can be used to determine MA in the 0.2 to 15 μmol·L −1 concentration range and with a 72 nmol·L −1 detection limit, which is much lower than the established safety limit. The method was successfully applied to the quantitation of MA in (spiked) raw milk and milk powder, with recoveries ranging from 98.5 % to 101.5 %.
We describe a colorimetric assay for the quantitation of melamine (MA). It relies on the observation that MA reverses the inhibition of the light-triggered activity of horseradish peroxidase (HRP) functionalized gold nanoclusters (HRP-Au NCs) by Hg(II) ions.
研究领域:
分析化学
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纳米技术
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食品安全
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产品关联
DOI
高影响因子
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