JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2016
·
IF 2.822
Weihua Zhu,Tingting Huang,Mingfeng Qin,Minzhi Li,John Mack,Xu Liang
In this study, a facile dechlorination of lindane is achieved under mild electron reductive conditions with a series of Co(III)corroles used as electrocatalysts . Spectroscopic, electrochemical, and spectroelectrochemical measurements are used to determine the mechanism of the reaction. A GC–MS analysis of the dechlorination products indicates that the meso -aryl substituents of the cobalt(III)corroles have a significant influence on the dechlorination efficiency when a fixed potential is applied. Under reductive catalysis, the Co(III)corroles provide highly satisfactory dechlorination results, since lindane was ultimately converted to chlorobenzene .
研究领域:
环境科学
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化学
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2021
·
IF 3.196
Jin-Juan Xing,Ping-Ping Sun,Yu-Hang Zhang,Xian-Yi Zhao,Fa-Nian Shi
ABSTRACT Three Co (III) complexes based on double ligands {[Co(2,2’-bpy)(2,5-HPda) (2,5-Pda)]Cl·2H 2 O, namely Co-1; [Co(2,2’-bpy)(2,5-Pda) 2 ]·2H 2 O, namely Co-2; [Co(2,2’-bpy)(2,5-HPda)(2,5-Pda)]NO 3 ·H 2 O, namely Co-3} were synthesized by hydrothermal methods. Single crystal X-ray diffraction (XRD), X-ray photoelectron spectrometer (XPS) and energy dispersive spectrometer (EDS) were applied to confirm the components of the three complexes and the oxidation states of the central atom. Optical micrograph, powder X-ray diffraction (PXRD), Fourier transform infrared spectroscopy (FT-IR) and ultraviolet-visible spectrum (UV-vis) were used to characterize these complexes. The thermal stabilities of the three complexes were further evaluated by thermo gravimetric analysis (TG). Afterwards, Co-3 was calcined under a flow of nitrogen at 420 °C for 2 h and the composites (C(N,O)/Co x O y ) were formed. When the composites were used as electrode materials for supercapacitors, the results showed an excellent specific capacitance of 544 F·g −1 in 6 M KOH solution at a current density of 2 A·g −1 . The cycle tests showed that the specific capacitance retained well after 2000 cycles at 20 A·g −1 current density.
研究领域:
材料化学
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能源科学
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2010
·
IF 3.325
Xianggang Liu,Xiangjin Qu,Hai Fan,Shiyun Ai,Ruixia Han
An electrochemical method for the detection of DNA hybridization using a novel electroactive, cationic, and water-soluble branched polyethyleneimine (BPEI)–cobalt(III)–phenanthroline(phen) polymeric indicator and single-stranded neutral peptide nucleic acid (PNA) probe on the Au electrode was developed. The indicator possesses some free amine groups, as well as cationic cobalt complexes in the polymer chain. It does not bind to neutral PNA capture probe alone. However, the indicator strongly interacts with the negatively charged backbone of the complementary oligonucleotide bound to the PNA probe through electrostatic interactions . The coordination spherical moieties also interact with the probe by embedding into the double-helix structure of PNA–DNA. These two interactions enable transduction of hybridization, producing a clear electrical signal in differential pulse voltammetry (DPV). The correlation against non-complementary DNA, three-base and one-base mismatch DNA was sharp, and the signal of indicator for the target DNA demonstrated a linear relationship within the concentration range of 5.0 × 10 −9 to 2.5 × 10 −7 M ( R = 0.9940) with a detection limit of 5.6 × 10 −10 M. These studies showed that the novel polymeric indicator and single-stranded PNA probe could be used to fabricate an electrochemical biosensor for DNA detection. This technique can provide an alternative route for expanding the range of detection methods available for DNA hybridization.
研究领域:
生物化学
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分析化学
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分子生物学
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DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
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2022
·Vol. 33
·期 6
·1892-1897
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IF 3.348
Xing Chen,Chenyang Hu,Huidi Xu,Rui Qu,Xiaohong Hu,Jie Yang,Xiaofeng Song
Polyurethane (PU) as a multifunctional material has been produced by various methods. In this work, a series of novel chloric PUs are made from p -toluene sulfonyl isocyanate (TSI) and epichlorohydrin (ECH) via direct salen catalysis under mild temperature. Catalytic efficiency and activity of salen metal complexes are analyzed and evaluated. The salen-cobalt (III) (DNP) exhibits high yield, excellent urethane selectivity, narrow polymer weight distribution in bulk polymerization with the molar ratio of TSI with catalyst changing. And compared to bulk polymerization, salen-cobalt (III) (DNP) can promote the reaction better in solution polymerization and synthesize the product with higher molecular weight. The obtained polymer shows excellent thermal stability, and its thermal degradation starts from 240.8°C. So, it will provide experience for developing functional PU under mild reaction conditions.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
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2016
·
IF 3.958
Li-Ting Huang,Atif Ali,Hua-Hua Wang,Fan Cheng,Hai-Yang Liu
Four cobalt (III) corroles bearing different number of pentafluorophenyl and phenyl groups were synthesized and characterized by elemental analysis, HR-MS, UV–vis, NMR, XPS as well as cyclic voltammetry. The first investigation of cobalt corrole catalyzed oxidation of alkene was conducted by using styrene as substrate. The best yield was obtained in acetonitrile solvent in the air with TBHP oxidant (96% yield based on oxidant, up to 96 TON). Benzaldehyde was detected as the main product by using PhI(OAc) 2 , TBHP, KHSO 5 , PhIO as oxidants. In contrast, styrene oxide was found to be the major product when using m -CPBA oxidant. Nearly no products could be found by using H 2 O 2 oxidant. Possible catalytic oxidation pathway was also discussed based on the obsewrvations of UV–vis changes of the ctatalytic system in the absence of substrate and in-situ HR-MS.
研究领域:
有机化学
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催化化学
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DOI
高影响因子
INORGANICA CHIMICA ACTA
·
2024
·
IF 2.7
Hou Cong Li,Ye Fan Zheng,Ming Zhu Wang,Chen Chen Geng,Min Hou,Chang Qing Liu,Wen Ge Li
Two new ligands, 2-(5,6-dihydrobenzo[4,5]imidazo[1,2-c]quinazolin-6-yl)phenol (H 2 L1′) and 2-(5,6-dihydrobenzo[4,5]imidazo[1,2-c]quinazolin-6-yl)-4-fluorophenol (H 2 L2′) were synthesized by 2-(2-aminophenyl)benzimidazole with salicylaldehyde and 5-fluorosalicylaldehyde, respectively. While the two ligands (H 2 L1′ and H 2 L2′) were coordinated with nickel (II) and cobalt (II) ions and represented open-chain Schiff base structures (H 2 L1 and H 2 L2). Their metal complexes: [Ni 2 (HL1) 2 (C 2 H 5 OH) 2 Cl 2 ]‧2C 2 H 5 OH (complex 1), [Co (HL1) (L1)] (complex 2), [Ni 2 (HL2) 2 (C 2 H 5 OH) 2 Cl 2 ]‧2C 2 H 5 OH (complex 3) and [Co (HL2) (L2)] (complex 4) were obtained by solvothermal reaction. The four Schiff base complexes were characterized by infrared spectroscopy, elemental analysis, thermal stability analysis, X-ray powder diffraction, single-crystal X-ray diffraction, and lipophilicity assay. Single crystal X-ray analysis reveals that complexes 1 and 3 crystallize in a monoclinic system with space group P 21/n, while complexes 2 and 4 crystallize in a trigonal system with space group R -3. The lipophilicity assay (Log P) showed that the introduction of fluorine atoms enhanced the lipophilicity of ligands and complexes. The MTT method was used to determine the IC 50 values of complexes, ligands, and cisplatin against four different tumor cells (A-549, SMMC-7721, MDA-MB-231, and CNE-2Z) and one normal cell (IOSE 80). The results indicated that the four complexes exhibited stronger anticancer efficacy than ligands, among which the fluorine-substituted Co (III) complex (complex 4) displayed greater cytotoxicity compared with cisplatin in inhibiting SMMC-7721, MDA-MB-231 cells and A-549 cells, respectively. In addition, complex 4 can increase intracellular reactive oxygen species levels, arrest cells in the G0/G1 phase, upregulate Bax levels, and downregulate Bcl-2 levels, inducing MDA-MB-231 cell apoptosis in a dose-dependent manner.
研究领域:
化学
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医学
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肿瘤学
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DOI
高影响因子
GREEN CHEMISTRY
·
2016
·Vol. 18
·期 12
·3567-3576
·
IF 8.506
Xu Jiang,Faliang Gou,Fengjuan Chen,Huanwang Jing
A series of innovative bisimidazole-functionalized porphyrin cobalt(III) complexes have been devised, synthesized and characterized using NMR, MS and elemental analysis. These homogeneous catalysts were applied to the cycloaddition of epoxides and carbon dioxide without organic solvent and co-catalyst. It was found that the performance of the catalysts deeply relies on their structural features. The alkoxyl chain length of the linkage and the imidazole position relative to the phenyl rings of porphyrin evidently affects the catalyst activities. [5,15-Di(3-((8-imidazolyloctyl)oxy)phenyl)porphyrin] cobalt(III) chloride (J-m8) and [5,15-di(2-((6-imidazolylhexyl)oxy)phenyl)porphyrin] cobalt(III) chloride (J-o6) demonstrated excellent activity under optimal reaction conditions. Synchronously, a preliminary kinetic investigation of this reaction was carried out using three catalysts and illustrated the activation energies of cyclic carbonate formation. Furthermore, a tri-synergistic catalytic mechanism has been carefully proposed in light of the features of the new catalysts and experimental results.
研究领域:
化学
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催化反应
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产品关联
DOI
高影响因子
POLYMER
·
2025
·
IF 4.5
Shuo Zeng,Qinghai Zhou,Xianhong Wang,Guo-Hua Hu,Zhao Wang,Liqun Zhang
Integrating carbon dioxide into polymeric materials aims to reduce dependence on fossil fuels in polymer development, while also helping to mitigate air pollution. In this study, we present a method for synthesizing CO 2 -based polymers with tunable glass transition temperatures ( T g ) ranging from −25 °C to +5 °C through the terpolymerization of CO 2 , allyl glycidyl ether (AGE, an unsaturated epoxide), and a saturated epoxide containing a long alkyl chain. By varying the AGE content and the alkyl chain length, we produced a series of elastomers with diverse mechanical properties. AGE incorporation provides effective cross-linking sites, resulting in higher cross-linking density, increased tensile strength, and reduced elongation at break as AGE content rises. Additionally, the introduction of saturated epoxides modulates the cross-linking density, with the T g decreasing linearly as the alkyl chain length of the saturated epoxides increases.
研究领域:
材料科学
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环境科学
·
化学工程
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产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Zhihong Yan,Hong Li
A Cobalt (III) trisphenanthroline complex ([Co(phen)3] 3+ ) has been adsorption assembled on a glassy carbon electrode (GCE) modified with DNA decorated with graphene oxide (GO) by multiple sweep voltammetry. In the present protocol, GO is served as a functional unit of DNA to greatly improve the efficient immobilization of DNA on the GC electrode and also offer a favorable microenvironment to keep the DNA structure of double-stranded (dsDNA), which facilitates the intercalation of redoxactive [Co(phen)3] 3+ . The evidences from scanning electron microscope, X-ray diffraction, cyclic voltammetry, electrochemical impedance spectroscopy, emission spectroscopy and differential pulse voltammetry reveal that [Co(phen)3] 3+ can be assembled on the surfaces of GO-decorated dsDNA driven by electrostatic attraction, intercalation and π-stacking interaction. Furthermore, the highly stable [Co(phen)3] 3+ /GO-dsDNA/GCE is used to the highly selective determination of 6- mercaptopurine (6-MP) in the human blood with satisfactory. The reduction peak current was linear to 6-MP concentration in the range from 5×10 -8 to 2×10 -6 M 6-MP, and the detection limit is 1.5×10 -8 M ( S / N = 3)
研究领域:
分析化学
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电化学
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纳米材料
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生物传感器
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产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 3
·1-8
·
IF 5.479
Liu Shi Gang,Luo Dan,Han Lei,Li Nian Bing,Luo Hong Qun
A hybrid material composed of guanine-rich single stranded DNA (G-rich ssDNA) and cobalt oxyhydroxide (CoOOH) nanosheets is used as a nanoprobe for fluorometric turn-on detection of ascorbic acid (AA). The CoOOH nanosheets function as a recognition component for AA. The G-rich ssDNA is used to produce a G-quadruplex, and the G-quadruplex/thioflavin T (ThT) complex acts as a fluorescent reporter. In the absence of AA, p-phenylenediamine (PPD) is oxidized to form oxPPD which has a dark red color. It causes the fluorescence of the G-quadruplex/ThT complex to be quenched. However, in the presence of AA, the CoOOH nanosheets of the nanoprobe are preferentially reduced by AA. Hence, PPD is not oxidized, and fluorescence is not quenched. A fluorometric turn-on method was developed based on these findings. It has a detection limit of 94 nM and works in the concentration range from 1 to 10 and 20 to 80 μM. This method was applied to the determination of AA in (spiked) fruit juice samples.
Schematic presentation of a fluorescent assay of ascorbic acid (AA) is established using a nanoprobe composed of guanine-rich single stranded DNA (G-rich ssDNA) and cobalt oxyhydroxide (CoOOH) nanosheets. It is based on competitive reduction of CoOOH by p-phenylenediamine (PPD) and AA. Thioflavine T (ThT) induces the formation of fluorescent G-quadruplex/ThT complex. The oxidized form of PPD (oxPPD) can quench the fluorescence via fluorescence resonance energy transfer (FRET), but AA suppresses quenching.
研究领域:
分析化学
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生物传感器
·
纳米技术
·
荧光光谱
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产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 12
·4757-4764
·
IF 3.069
Yunfan Yin,Qianghua Wu,Qingxian Liu,Longchao Du
The greenhouse gas carbon dioxide was converted to an oligomeric poly(propylene carbonate)-diol by a high activity salen–Co(III) catalyst. The new mussel biomimetic hydrogel was synthesized by the reaction of poly(propylene carbonate)-diol with 1,6-hexamethylene diisocyanate followed by lysine dopamine as a chain extender. DSC tests indicate that the hydrogel has two Tg peaks, and they gradually become compatible upon increasing the molecular weight of poly(propylene carbonate)-diol. The TGA curve shows that the hydrogel gradually degrades with the degradation of the dopamine side chain, the poly(propylene carbonate) backbone and the polyurethane backbone. UV-vis spectroscopy showed that when mixed with Fe3+, Fe3+ has different complex numbers with the hydrogel at different pH values, accompanied with color changes. Rheological tests show that the stronger the alkalinity, the greater the elastic modulus of the hydrogel. SEM confirmed the cross-linking structure of the hydrogel. The numerous catechol groups impart good cell affinity and bio-tissue adhesion to the hydrogel and promote tissue adhesion and integration. By using CO2, the biomimetic material can reduce greenhouse gas emissions, which will have broad application prospects.
研究领域:
材料科学
·
化学工程
·
环境科学
·
生物材料
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）