摘要：
Two Th (IV) complexes {[4-NO2-C6H4(O)C= N-N = C(R)-(R)C= N-N = C(O)-(4-NO2-C6H4)](2)Th(CH3OH)(2)} ( R = Ph ( I ); CH3 (II))were synthesized and characterized by IR, elemental analysis and thermal stability analysis, and the crystal structures were determined by X-ray diffraction. The Th in the complexes I and II adopt ten coordination configuration. Complex I and II also forms a two-dimensional network structure through the abundant hydrogen bond interaction of C -H on the benzene ring with O atom on NO2- groups. The UV-vis and quantum chemical calculations of I and II have been investigated. (c) 2021 Elsevier B.V. All rights reserved.
摘要：
Two new bearing Bi（Ⅲ） supramolecular compounds [Bi（pydcH）3(Bi（pydcH）（pydcH2）（pydc）(Bi（pydcH）（pydcH2）（pydc）]（1） and {[Bi（pydcH）3]·（H2O）5（Dmap）}2（2） have been successfully synthesized via hydrothermal reaction（pydcH2 = 2,6-pyridine dicarboxylate, Dmap = 4-dimethylamiopyridine）. They have been structurally determined by single-crystal X-ray analysis, and characterized by fluorescence analysis and thermogravimetric analysis（TG）. Both compounds 1 and 2 are of the same triclinic system with different structures. The decomposition mechanisms of compounds 1 and 2 are discussed. Compared to 1, lots of small molecules were possibly removed from compound 2 below 250 ℃. In addition, the photoluminescence properties were also investigated.
作者机构：
[李文艺; 唐胤恒] College of Chemistry and Materials Science, Hengyang Normal University, Hengyang, 421000, China;[陈锦杨; 欧阳文韬; 陆雨函; 何卫民] School of Chemistry and Chemical Engineering, University of South China, Hengyang, 421001, China
通讯机构：
[Chen, J.; He, W.] S;School of Chemistry and Chemical Engineering, China
作者机构：
[Deng, Peihong; Li, Junhua] Hengyang Normal Univ, Key Lab Funct Organometall Mat Hunan Prov Univ, Dept Chem & Mat Sci, Key Lab Funct Met Organ Cpds Hunan Prov, Hengyang 421008, Peoples R China.;[He, Quanguo; Tian, Yaling; Wu, Yiyong; Xiao, Jingyun; Feng, Jinxia] Hunan Univ Technol, Sch Life Sci & Chem, Zhuzhou 412007, Peoples R China.
通讯机构：
[Peihong Deng] D;[Quanguo He] S;School of Life Science and Chemistry, Hunan University of Technology, Zhuzhou 412007, China<&wdkj&>Department of Chemistry and Material Science, Hengyang Normal University, Key Laboratory of Functional Metal-Organic Compounds of Hunan Province, Key Laboratory of Functional Organometallic Materials of Hunan Provincial Universities, Hengyang 421008, China
摘要：
In recent years, small-sized electrodes have drawn widespread attraction in electroanalysis due to high sensitivity, rapid response and low cost. Hereby, a sub-millimeter paste electrode with inner diameter of 0.8 mm was prepared by combining the excellent properties of reduced graphene oxide (rGO) and acetylene black (AB), and the electrochemical behavior of tyrosine (Tyr) on the modified electrode (denoted as rGO/ABPE) was investigated in detail. The electrochemical responses obtained on the sub-millimeter rGO/ABPE were compared with that obtained on a conventional size electrode with diameter of 3 mm. The results showed that the 0.8 mm one has better performance than that of 3 mm. Compared with the paste electrode made of graphite powder, the oxidation peak current of Tyr increased significantly due to the synergistic effect of rGO and AB. Under the optimized experimental conditions, the calibration curve of Tyr showed a linear relationship between 0.1 and 100 ?M (R = 0.9995) with good sensitivity of 3.314 ?A ?M-1 cm-2, and the detection limit was 0.06 ?M. By comparison with conventional size electrode, the detection of Tyr on the sub-millimeter electrode shows higher sensitivity, wider linear range and lower detection limit. In addition, the excellent reproducibility, stability and selectivity of the sub-millimeter rGO/ABPE make it suitable for Tyr analysis in both food and biological samples.
期刊：
JOURNAL OF THE ELECTROCHEMICAL SOCIETY,2021年168(12):126529 ISSN：0013-4651
通讯作者：
Deng, Peihong
作者机构：
[He, Quanguo; Deng, Peihong; Li, Junhua] Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Peoples R China.;[He, Quanguo; Deng, Peihong; Li, Junhua] Univ Hunan Prov, Key Lab Funct Organomet Mat, Hengyang 421008, Peoples R China.;[He, Quanguo; Deng, Peihong; Li, Junhua] Key Lab Funct Metal Organ Cpds Hunan Province, Hengyang 421008, Peoples R China.;[He, Quanguo; Deng, Peihong; Li, Junhua] Key Lab Chem Sensing & Catalysis, Hengyang 421008, Peoples R China.;[He, Quanguo; Zuo, Jinsong; Wei, Yanping; Feng, Jinxia; Xiao, Jingyun; Ding, Jianhua] Hunan Univ Technol, Sch Life Sci & Chem, Zhuzhou 412007, Peoples R China.
通讯机构：
[Deng, Peihong] H;[Deng, Peihong] U;[Deng, Peihong] K;Hengyang Normal Univ, Dept Chem & Mat Sci, Hengyang 421008, Peoples R China.;Univ Hunan Prov, Key Lab Funct Organomet Mat, Hengyang 421008, Peoples R China.
摘要：
High levels of uric acid (UA) in the human body usually cause diabetes, hypertension and atherosclerosis, kidney diseases, and neurological diseases. Hence, it is important to develop sensitive methods for UA determination. In this paper, nanocomposite composed of ceria nanoparticles and reduced graphene was successfully modified on the surface of glassy carbon electrode (ceria NPs-rGO/GCE) by a simple electroreduction method. The morphology, structure and property of the ceria NPs-rGO/GCE was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). The electrocatalytic activity of the ceria NPs-rGO/GCE for uric acid (UA) oxidation was studied in detail. The results showed that the ceria NPs-rGO/GCE exhibited excellent selectivity and high sensitivity for UA detection. In 0.05 M H2SO4 solution, a linear range of 0.02-20 mu M and a low detection limit of 8.0 nM of UA were obtained on the ceria NPs-rGO/GCE. This developed method was successfully applied for the detection of UA in human serum and urine samples, and its recoveries reached 95.8%-105.0%. (C) 2021 The Electrochemical Society ("ECS"). Published on behalf of ECS by IOP Publishing Limited.
期刊：
Microporous and Mesoporous Materials,2021年323:111240 ISSN：1387-1811
通讯作者：
Xia Xiaohong
作者机构：
[Deping, Wang] Hengyang Normal Univ, Coll Chem & Mat Sci, Hengyang 421008, Hunan, Peoples R China.;[Deping, Wang] Key Lab Funct Met Organ Cpds Hunan Prov, Hengyang, Peoples R China.;[Hongbo, Liu; Wufeng, Fan; Wenming, Hu; Xiaohong, Xia] Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Hunan, Peoples R China.;[Junqiang, Liu] Hunan Univ, Hunan Joint Int Lab Adv Mat & Technol Clean Energ, Changsha 410082, Hunan, Peoples R China.;[Hongbo, Liu] Chenzhou Shanshan Corp, Chenzhou 423400, Hunan, Peoples R China.
通讯机构：
[Xia Xiaohong] C;College of Material Science and Engineering, Hunan University, Changsha, Hunan, 410082, China<&wdkj&>Hunan Joint International Laboratory of Advanced Materials and Technology for Clean Energy, Hunan University, Changsha, Hunan, 410082, China
摘要：
Metal-organic frameworks (MOFs) have attracted numerous attentions as anode materials for lithium-ion batteries (LIBs) owing to their unique tunable structures. However, utilizing MOFs in electrochemical devices has been hampered by the inferior electrical conductivity and poor stability that dominate the cycling stability and rate performance of electrodes. Herein, a Ni-PTA/graphene hybrid with porous spherical structure has been successfully constructed by interconnected needle-like Ni-MOFs nanocrystals after the introduction of amine functionalized graphene (NG). The conductivity and structural stability of the composites have been greatly improved due to the chemical bonds formed between the N-containing graphene and the MOFs. When used as anode materials for LIBs, the synthesized Ni-PTA/NG composite shows a superior Li storage with a reversible capacity of 1585 mAh g-1 at a current density of 200 mA g-1. In addition, Ni-PTA/NG composite demonstrates an ameliorative rate performance (340 mAh g-1 at 5 A g-1) and long-term cyclability (570 mAh g-1 at 1 A g-1 after 420 repeated cycles), significantly higher than traditional graphene/MOF composite materials. The novel method in this work paves a new way to form 3D structure by using NG to induce MOF germination, which may be extended to preparing other metal/metal oxides materials for electrochemical energy-storage systems.
作者机构：
[Yuan, Ze; Cui, Ying; Song, Minghui; Zhen, Deshuai; Hu, Jiawen] Hunan Univ, Hunan Key Lab Two Dimens Mat, Adv Catalyt Engn Res Ctr, Minist Educ, Changsha 410082, Hunan, Peoples R China.;[Yuan, Ze; Cui, Ying; Song, Minghui; Zhen, Deshuai; Hu, Jiawen] Hunan Univ, Coll Chem & Chem Engn, Changsha 410082, Hunan, Peoples R China.;[Cui, Ying; Li, Junhua] Hengyang Normal Univ, Coll Chem & Mat Sci, Hengyang 421001, Peoples R China.;[Zhu, Baode] Xiangnan Univ, Coll Chem Biol & Environm Engn, Chenzhou 423043, Peoples R China.;[Qian, Dong] Cent South Univ, Coll Chem & Chem Engn, Hunan Prov Key Lab Chem Power Resources, Changsha 410083, Peoples R China.
通讯机构：
[Zhen, Deshuai; Li, Junhua] H;[Zhu, Baode] X;Hunan Univ, Hunan Key Lab Two Dimens Mat, Adv Catalyt Engn Res Ctr, Minist Educ, Changsha 410082, Hunan, Peoples R China.;Hunan Univ, Coll Chem & Chem Engn, Changsha 410082, Hunan, Peoples R China.;Hengyang Normal Univ, Coll Chem & Mat Sci, Hengyang 421001, Peoples R China.
关键词：
Electrochemical biosensor;CRISPR-Cas13a system;Catalytic hairpin assembly;Cascade signal amplification;miRNA-21
摘要：
MicroRNAs (miRNAs) are related to many biological processes and regarded as biomarkers of disease. Rapid, sensitive, and specific methods for miRNA assay are very important for early disease diagnostic and therapy. In the present work, an ultrasensitive electrochemical biosensing platform has been developed for miRNA-21 assay by combining CRISPR-Cas13a system and catalytic hairpin assembly (CHA). In the presence of miRNA-21, it would hybridize with the spacer region of Cas13a/crRNA duplex to activate the cleavage activity of CRISPR-Cas13a system, leading to the release of initiator of CHA to generate amplified electrochemical signals. Base on the CRISPR-Cas13a-mediated cascade signal amplification strategy, the developed electrochemical biosensing platform exhibited high sensitivity with a low detection limit of 2.6 fM (S/N = 3), indicating that the platform has great potential for application in early clinical diagnostic.
作者机构：
[Fan, Shanji; Hu, Zecheng; Chen, Hong; Huang, Hong; Xu, Jiachi] Univ South China, Affiliated Hosp 1, Hengyang Med Sch, Hengyang 421001, Hunan, Peoples R China.;[Cui, Ying] Hengyang Normal Univ, Coll Chem & Mat Sci, Hengyang 421001, Peoples R China.
通讯机构：
[Cui, Ying] H;Hengyang Normal Univ, Coll Chem & Mat Sci, Hengyang 421001, Peoples R China.
关键词：
TiO2 Nanotubes;Cytochrome c;Sensitivity;CdS
摘要：
A CdS nanocrystal enhanced TiO2 nanotubes (CdS@TiO2 NATs) photoelectrode was prepared via successive ionic layer adsorption and reaction (SILAR) of CdS on the surface of TiO2 NATs. A HS-aptamer owing a specific binding toward cytochrome c was modified onto the CdS@TiO2 NATs, which resulting a decrease in the photoelectrical current intensity. Cytochrome c is therefore quantified based on the decrease in photoelectrical current. High specificity and high sensitivity were obtained with a linear range from 3 pM to 80 nM, and a limit of detection of 2.53 pM.
摘要：
A electrochemical sensor based on graphene and gold nanoparticles modified glassy carbon electrode (GCE) was developed for the determination of tyrosine (Tyr). The graphene and gold nanoparticles modified glassy carbon electrode (GR/Au NPs/GCE) was prepared by potentiostatic deposition of gold nanoparticles on the grephene coated GCE. Cyclic voltammetry and linear sweep voltammetry were used to study the electrochemical behavior of Tyr on the modified electrode, which showed improved electrocatalytic behavior for oxidation of Tyr due to the significant enhancement of peak current. A linear response between the peak current and the Tyr concentration was detected between 100 nM–100 μM and the detection limit (S/N = 3) was 47 nM. The simple preparation and the good sensitivity make this graphene/gold nanoparticles modified GCE very promising for Tyr analysis in real samples.
摘要：
More and more attention has been paid to AlCrN coatings with self-lubricating property and high temperature oxidation resistance. In this study, the synergy of V and Si on the microstructure, tribological and oxidation properties of AlCrN coatings is investigated in detail. With V is gradually replaced by Si, coatings' microstructures are transformed from compact columnar to coarse columnar, and a dense fine-grained structure, and finally to a featureless dense structure. When the V content is 10 at.%, the coating is consisted of c-VN and c-Al(Cr)N solid solution phases. As decreasing the ratio of V to Si, there is only a cubic Al-Cr-V-N solid solution phase in Al0.58Cr0.31V0.08Si0.03N coating and the coexistence of c-Al(Cr)N and h-Al(Cr)N phases in Al0.58Cr0.31V0.04Si0.07N coating. The addition of Si can promote the transition from c-Al(Cr)N solid solution to h-Al(Cr)N solid solution, and finally forming a nanocomposite structure composed of h-Al(Cr)N nanocrystalline and alpha-Si3N4 for Al0.58Cr0.32Si0.1N coating. The performance test results indicate that the Al0.58Cr0.31V0.04Si0.07N coating has the best resistance to plastic deformation, the lowest wear rate of 2.72 x 10(-16) m(3).N-1.m(-1) and the oxidation resistance temperature of 1000 degrees C attributing to the synergistic effect of V and Si.
作者机构：
[刘剑; 陈熙; 黄依倪; 易正戟] Key Laboratory of Functional Organometallic Materials, University of Hunan Province, Key Laboratory of Functional Metal-Organic Compounds of Hunan Province, College of Chemistry and Material Science, Hengyang Normal University, Hengyang, 421008, China
通讯机构：
[Yi, Z.] K;Key Laboratory of Functional Organometallic Materials, China
作者机构：
[Dr. Yao Zhou; Prof. Dr. Jun-tao Li] College of Energy, Xiamen University, Xiamen, 361005 China;Hunan Engineering Research Center for monitoring and treatment of heavy metals pollution in the upper reaches of XiangJiang River, Key Laboratory of Functional Metal-Organic Compounds of Hunan Province, College of Chemistry and Material Science, Hengyang Normal University, Hengyang, 421001 China;[Dr. Jian Yang; Dr. Wei-qiong Li; Prof. Dr. Jian-feng Li; Prof. Dr. Shi-Gang Sun] State Key Lab of Physical Chemistry of Solid Surface, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005 China;[Dr. Peng-fang Zhang] Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, 252000 P. R. China;[Dr. Yi-jin Wu; Teng-xiu Tu] College of Energy, Xiamen University, Xiamen, 361005 China<&wdkj&>Hunan Engineering Research Center for monitoring and treatment of heavy metals pollution in the upper reaches of XiangJiang River, Key Laboratory of Functional Metal-Organic Compounds of Hunan Province, College of Chemistry and Material Science, Hengyang Normal University, Hengyang, 421001 China
通讯机构：
[Dr. Yao Zhou; Prof. Dr. Jun-tao Li] C;College of Energy, Xiamen University, Xiamen, 361005 China
摘要：
Defects have been found to enhance the electrocatalytic performance of NiFe-LDH for oxygen evolution reaction (OER). Nevertheless, their specific configuration and the role played in regulating the surface reconstruction of electrocatalysts remain ambiguous. Herein, cationic vacancy defects are generated via aprotic-solvent-solvation-induced leaking of metal cations from NiFe-LDH nanosheets. DFT calculation and in situ Raman spectroscopic observation both reveal that the as-generated cationic vacancy defects tend to exist as VM (M=Ni/Fe); under increasing applied voltage, they tend to assume the configuration VMOH, and eventually transform into VMOH-H which is the most active yet most difficult to form thermodynamically. Meanwhile, with increasing voltage the surface crystalline Ni(OH)x in the NiFe-LDH is gradually converted into disordered status; under sufficiently high voltage when oxygen bubbles start to evolve, local NiOOH species become appearing, which is the residual product from the formation of vacancy VMOH-H. Thus, we demonstrate that the cationic defects evolve along with increasing applied voltage (VM → VMOH → VMOH-H), and reveal the essential motif for the surface restructuration process of NiFe-LDH (crystalline Ni(OH)x → disordered Ni(OH)x → NiOOH). Our work provides insight into defect-induced surface restructuration behaviors of NiFe-LDH as a typical precatalyst for efficient OER electrocatalysis.
期刊：
Chinese Journal of Structural Chemistry,2021年40(12):1639-1646 ISSN：0254-5861
作者机构：
Key Laboratory of Functional Metal-organic Compounds of Hunan Province,Key Laboratory of Functional Organometallic Materials of College of Hunan Province,Department of Chemistry and Material Science,Hengyang Normal University,Hengyang,Hunan 421008,China;[FENG Yong-Lan; ZHANG Fu-Xing; KUANG Dai-Zhi; JIANG Wu-Jiu] 湖南省高等专科学校
摘要：
A series of dibutyltin complexes,(Bu_2Sn)_2L, [(Bu_2Sn)_2L]_3 and H_2LSnBu_2, were synthesized by microwave-assisted methanolic solvothermal method, where H_4L is [2-(OH)-R-ArCH=NNH]_2CX, and X = O, R = 4-NEt_2(T1),5-Br(T2);X = S, R = H(T3);R = 5-Br(T4).Their structures were characterized by elemental analysis, IR and(~1H, ~(13)C)-NMR spectra.The molecular structure of T2 was confirmed by X-ray diffraction.The crystal of T2 belongs to monoclinic system, space group Ia.Five-coordinated distorted triangular bipyramids and six-coordinated distorted octahedral configurations were formed by the coordination of oxygen and nitrogen atoms of ligand with two dibutyltins, thus forming a trimeric hexanuclear butyltin complex by the cross coordination of three units(Bu_2Sn)_2L with enol imines.The T2 and T4 exhibit fluorescence emission in DMF solvents and DMF-water mixture.The fluorescence intensity of T2-DMF-H_2O system decreases almost linearly with the increase of water volume fraction(WVF).The aggregation fluorescence enhancement effect of T4-DMF-H_2O solution system increases with the increase of WVF at the range of 0~20% WVF.When WVF is more than 20%, the fluorescence intensity decreases with the increase of WVF.In addition, T1~T4 have broad growth activities on target plants, such as Portulaca oleracea L.,Amaranthus spinosus L.,Cassia tora L.,Brassica campestris L.ssp.chinensis var.utilis Tsen et Lee, and Amaranthus tricolor L.,and can be used as a candidate herbicide for further research.
期刊：
Chinese Journal of Structural Chemistry,2021年40(12):1673-1679 ISSN：0254-5861
作者机构：
[张志坚; 谭宇星; 蒋伍玖] Key Laboratory of Functional Metal-organic Compounds of Hunan Province, Key Laboratory of Functional Organometallic Materials, University of Hunan Province, Hunan Provincial Engineering Research Center for Monitoring and Treatment of Heavy Metals Pollution in the Upper Reaches of Xiangjiang River, College of Chemistry and Materials Science, Hengyang Normal University;[南小龙] Nuclear Bureau of Hunan Province Nuclear Industry Brigade 306;[谭延亮] Hunan Provincial Engineering Research Center for Uranium Mineral Exploration Technology, College of Physics and Electronic Engineering, Hengyang Normal University
摘要：
Two UO_2~(2+) complexes {[C_5H_4N(O)C=N-N=C(Ph)-(Ph)C=N-N=C(O)-C_5H_4N]_2UO_2(CH_3OH)}(I) and {[C_5H_4N(O)C=N-N=C(Ph)-(Ph)C=N-N=C(O)-C_5H_4N]_2UO_2(C_5H_4N(O)C=N-NH_2)}(II) were synthesized and characterized by IR,elemental analysis and thermal stability analysis, and the crystal structures were determined by X-ray diffraction.The crystal of complex I belongs to monoclinic system, space group P2_1/n with a = 11.7678(4), b= 16.9667(6), c = 14.3051(5) A,β = 98.918(3)°, Z = 4, V = 2821.64(17) A~3, D_c = 1.837 Mg·m~(-3),µ(MoKa)= 5.805 mm~(-1), F(000) = 1504, R = 0.0346 and wR = 0.0688.The crystal of complex II is of triclinic system, space group P1 with a = 11.6417(5),b = 11.7297(5),c = 14.2197(5) A,α = 71.697(4)°,β=86.020(3)°, y = 71.572(4)°,Z = 2, V= 1748.02(12) A~3,D_c = 1.742 Mg·m~(-3), µ(MoKa) = 4.704 mm~(-1), F(000) = 894,R = 0.0283 and wR = 0.0537.The U1 is a seven-coordinate pentagonal bipyramidal configuration in I and an eight-coordinate hexagonal dipyramidal configuration in II.The thermal stability and quantum chemical calculations of I and II were also investigated.
