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Strategies for the construction of supramolecular assemblies from poly-NHC ligand precursors

Science China Chemistry 2021年第5期64卷 701-718页

作者： Yang Li jian-Gang Yu Li-Li Ma Man Li yuan-yuan An Ying-Feng Han Key Laboratory of Synthetic and Natural Functional Molecule Chemistry FM&EM International Joint LaboratoryCollege of Chemistry and Materials ScienceNorthwest UniversityXi’an 710127China College of Chemical and Material Engineering Quzhou UniversityQuzhou 324000China State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China

The field of supramolecular assemblies has developed rapidly in the last few decades,thanks in a large part to their diverse *** assemblies have been mostly based on Werner-type coordination motifs in which metal centres are coordinated by nitrogen or oxygen ***,N-heterocyclic carbene(NHC)ligands have been employed as carbon donors not only because of their appealing structures but also due to the extensive applications in catalysis,biomedicine and material science of the resulting *** the last decade,NHC-based supramolecular assemblies have witnessed rapid growth and extensive application in molecular recognition,luminescent materials and *** different topological systems,a diverse selection of poly-NHC precursors and synthetic strategies is crucial to precisely control the synthesis of supramolecular *** synthetic strategies have been developed to synthesise two-dimensional(2D)molecular metallacycles and three-dimensional(3D)metallacages from a wide range of poly-NHC precursors,including a straightforward one-pot strategy,supramolecular transmetalation,stepwise synthesis,an improved one-pot strategy involving self-sorting behaviour of 3D metallacages and a subtle variation strategy of poly-NHC ligand *** review offers a summary of the synthetic strategies applied for the construction of different poly-NHC-based supramolecular assemblies,particularly emphasizes recent progress in the synthesis of large and complex supramolecular assemblies from poly-NHC precursors,and further attention is given to their application in postsynthetic modifications(PSMs),host-guest chemistry,luminescent properties and biomedical applications.

关键词： N-heterocyclic carbene organometallic chemistry supramolecular chemistry synthetic strategies applications

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An environmentally benign benzylic oxidation catalyzed by hypervalent iodine intermediate in water

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Chinese Chemical Letters 2012年第8期23卷 891-894页

作者： yuan Xu jian Tao Hu Jie Yan College of Chemical Engineering and Materials Science Zhejiang University of TechnologyHangzhou 310032China

An effective and environmentally benign benzylic oxidation for transition of alkylarenes into the corresponding carbonyl compounds was reported. Alkylarenes were mixed and stirred with potassium bromide, m-chloroperbenzoic acid and a catalytic amount of iodobenzene in water at 60 ℃ for several hours, a series of the corresponding carbonyl compounds was obtained in moderate to good yields. In the reaction, iodobenzene was first oxidized by m-chloroperbenzoic acid into the hypervalent iodine intermediate which then reacted with potassium bromide to form the key radical initiator for the benzylic oxidation.

关键词： Benzylic oxidation Hypervalent iodine intermediate Catalytic reaction Synthesis

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Molecular Cloning and Expression Analysis of an Actin Gene from Chinese Licorice(Glycyrrhiza uralensis Fisch)

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Chemical Research in Chinese Universities 2009年第3期25卷 357-361页

作者： WANG Fang DONG Le yuan jian-jun Department of Biology School of Chemical and Biology Science Quanzhou Normal University Quanzhou 362000 P R. China

A PCR-based homologous cloning strategy was used to identify an actin gene from the roots of Chinese licorice（Glycyrrhiza uralensis Fisch）. Results of sequence analysis indicate that a 1137 bp cDNA with an open reading frame encoding 377 amino acids, actin ortholog, GuActin, was successfully cloned and characterized（GenBank accession No. EU190972）. Thus far, GuActin is the first actin of Chinese licorice that has been identified at a molecular level. Analysis by Northern blot shows that GuActin was expressed strongly in the roots, particularly in radicles than in stems and leaves. These results suggest that GuActin may be a member of the vegetative subfamily of the actin family.

关键词： Actin Gene cloning Chinese licorice(Glycyrrhiza uralensis Fisch) Gene expression

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Promoting the Activity of Bifunctional Catalysts for Autoxidation of 1-Octanethiol

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Chinese Chemical Letters 2001年第6期12卷 529-532页

作者： jian Hua ZHU Zhen WU yuan CHUN Department of Chemistry Nanjing UniversityNanjing 210093

Methanol and detergent are chosen to be additives for the catalysts derived from active carbon supported MgO and cobalt phthalocyanine (CoPc) or CoPc/NaY zeolite, and dramatically improved the activity and stability o... 详细信息

关键词： Additive 1-octanethiol autoxidation CoPc/SiO2 CoPc/NaY zeolite

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Effect of Xinfeng capsule in the treatment of active rheumatoid arthritis: a randomized controlled trial

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Journal of Traditional Chinese Medicine 2015年第6期35卷 626-631页

作者： Wang Yali Liu jian Wang yuan Sun Yue Rheumatism Department Anhui University of Chinese Medicine Department of Rheumatism Immunity The First Affiliated HospitalAnhui University of Chinese Medicine

OBJECTIVE: To explore the use of Xinfeng capsule(XFC) in the treatment of active rheumatoid arthritis(RA) and its effect on immunoglobulin titer, B cell-activating factor(BAFF) and its receptor(BAFF-R).METHODS: A multi-center randomized, doubleblind, parallel-controlled study was conducted. 45 RA patients were assigned to two groups: one was treated with XFC plus the placebo for leflunomide(LEF) and the second group was treated with LEF plus XFC placebo, for 12 weeks. The clinical and laboratory parameters were collected at baseline and at 12 ***: After 12 weeks of treatment, patients in the two groups all showed an therapeutic effect when ACR20, ACR50 and ACR70 were compared,but the differences between two groups were not significant(P < 0.05). The serum levels of Ig G1,BAFF and BAFF-R in the XFC group were lower than those in the LEF group(P < 0.05). The level Ig G subtypes correlated with clinical parameters; Ig G2 levels positively correlated with C-reactive protein(CRP)(P < 0.01); Ig G3 levels positively correlated with white blood cell count and CRP(P < 0.01);Ig G4 levels positively correlated with Complement4( C4)(P < 0.01); the level of BAFF negatively correlated with Lymphocyte( LYMPH#)(P < 0.01); however,BAFF-Rpositivelycorrelatedwith Platelet( PLT)and a1-acid glycoprotein(AGP)(P < 0.01).CONCLUSION: XFC can regulate the level of BAFF/BAFF-R in active rheumatoid arthritis and improve the levels of immunoglobulins in RA patients.

关键词： Arthritis, rheumatoid Xinfeng capsule Immunoglobulins Randomized controlled trial

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Embedding pyridine units in acceptors to construct donor-acceptor conjugated polymers

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Chinese Chemical Letters 2019年第1期30卷 25-30页

作者： Zi-yuan Wang Jie-Yu Wang jian Pei Beijing National Laboratory for Molecular Sciences Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education Key Laboratory of Polymer Chemistry and Physics of Ministry of Education Center for Soft Matter Science and Engineering College of Chemistry and Molecular Engineering Peking University

The development of donor-acceptor(D-A) conjugated polymers greatly promotes the device performance in organic electronics. Recently, the strategy of embedding pyridine units into D-A conjugated polymer backbones has attracted much attention due to the resulted lowered LUMO levels. In addition, the possible non-bonding interactions resulted from the nitrogen atoms also improve the coplanarity of the polymer backbones. All these factors have great contribution to enhance the device performance. In this review, we summarized the recent development of pyridine-embedded D-A conjugated polymers and their applications in organic field-effect transistors(OFETs).

关键词： Donor-acceptor Conjugated polymers Coplanarity Pyridine-embedded Organic electronics

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A typical flat-panel membrane bioreactor with a composite membrane for sulfur removal

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Frontiers of Earth Science 2014年第1期8卷 142-149页

作者： jian GUAN yuan XIAO Jimin SONG Junhe MIAO China Special Equipment Inspection and Research institute Beijing 100013 China Shenyang Institute of Special Equipment Inspection and Research Shenyang 110035 China

The aim of this work was to provide a concrete study to understand the effects of operation on biofilm morphology and microstrucmre and degradation efficiency for the disposal of sulfur dioxide produced by coal-fired power plants. For this purpose, a flat-panel reacto~ membrane bioreactor （MBR） with a composite membrane consisting of a dense layer and a support layer was designed; the membrane bioreactors inoculated with Thiobacillus ferrooxidans were further conducted for the removal of sulfur dioxide. Dry weight, active biomass, pressure drop, removal efficiency, morphology and structure of the formed biofilms were investigated and analyzed over period of biofilm formation. The results found that the dry weight, biomass, pressure drops and removal efficiency increased rapidly during biofilm formation, remained relatively stable in the stabilization period ofbiofilm growth, and finally reached 0.085 g, 7.00 pg, 180 Pa, and 78%, respectively. Our results suggested the MBR is available for flue-gas desulfurization.

关键词： membrane bioreactor biofilm flue gas desul- furization biodegradation sulfur dioxide

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Assessment model for tribological property of ceramic/stainless steel rubbing pairs in H_2O_2 solution

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Science China(Technological Sciences) 2013年第12期56卷 3017-3023页

作者： DONG CongLin yuan ChengQing LI jian YAN XinPing School of Energy and Power Engineering Wuhan University of Technology Key Laboratory of Marine Power Engineering & Technology of Ministry of Communications Wuhan University of Technology Wuhan Research Institute of Materials Protection

The tribological properties of ZrO2 ceramic and 1Cr18Ni9Ti stainless steel rubbing pairs were investigated using a special tribo-tester under different concentrations of hydrogen peroxide (H2O2) *** comparison analyses of the friction coefficients,worn volume rates,worn particles and surface roughness were conducted under the tested *** were significant differences of the tribological properties of the rubbing pairs in the different concentrations H2O2 solution because of oxidation and *** research has revealed that the main wear mechanisms between the rubbing pairs are severe adhesive wear,abrasive wear and corrosive wear in the H2O2 solution with different concentrations.A model has been established to assess the most suitable concentration of the H2O2 solution for the tribological properties of the rubbing *** result shows that 50% concentration of the H2O2 solution is the most *** assessment result is consistent with the experimental *** is believed that the knowledge gained in this study is useful for the optimization of the friction pairs in the extreme condition.

关键词： ZrO2 ceramic 1Cr18Ni9Ti stainless steel hydrogen peroxide

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Evolutional Properties of Localized Excitations for Generalized Broer-Kaup System in （2＋1） Dimensions

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Communications in Theoretical Physics 2006年第3X期46卷 461-466页

作者： ZHENG Chun-Long YE jian-Feng XU yuan College of Mathematics and Physics Lishui University Lishui 323000 China Basic Department Guangsha College of Applied Construction Technology Dongyang 321006 China Department of Information Engineering Lishui College of Professional Technology Lishui 323000 China

Using a special Painleve-Baecklund transformation as well as the extended mapping approach and the linear superposition theorem, we obtain new families of variable separation solutions to the （2＋1）-dimensional generalized Broer-Kaup （GBK） system. Based on the derived exact solution, we reveal some novel evolutional behaviors of localized excitations, i.e. fission and fusion phenomena in the （2＋1）-dimensional GBK system.

关键词： GBK system variable separation solution localized excitation fission fusion

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Deposition Behavior at Different Substrate Temperatures by Using Supersonic Laser Deposition

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Journal of Iron and Steel Research International 2013年第10期20卷 87-93页

作者： yuan Lin-jiang LUO fang YAO jian-hua Key Laboratory of Special Purpose Equipment and Advanced Processing Technology of Ministry of Education Zhejiang University of Technology College of Zhijiang Zhejiang University of Technology

The supersonic laser deposition （SLD） is a new fabrication process which combines the supersonic powder stream found in cold spray with laser heating of the deposition zone. Because of the instantaneity of particles impact, the deformation behaviors and the adhesion behaviors of particles impacted on the substrate by SI.D cannot be well investigated through experiments. Therefore, a finite elemen! model was developed to solve the problems above. Meanwhile, the heat effect of the substrate heated by laser was discussed. The effective plastic strain and the effec- tive stress between the particle and substrate at different laser preheal temperatures were studied. The results show that laser depositing temperatures of 1 000 and 1 100 ℃ on substrate would be the optimized for the bonding of parti- cles and substrate. In addition, the simulation results conformed to experimental results.

关键词： supersonic laser deposition deformation behavior adhesion behavior finite element model

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