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Polymerization of methyl methacrylate catalyzed by mono-/bis-salicylaldiminato nickel(Ⅱ) complexes and methylaluminoxane

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Frontiers of Chemical Science and Engineering 2011年第1期5卷 19-25页

作者： jihong lu Danfeng ZHANG Qian CHEN Buwei YU School of Materials Science and Engineering East China University of Science and TechnologyShanghai 200237China Daqing Petrochemical Research Center of CNPC Daqing 163714China

Two types of salicylaldiminato-based nickel complexes,mono-ligated Ni(II)complexes([O-C_(6)H_(4)-o-C(H)=N-Ar]Ni(PPh_(3))(Ph)(5),[O-(3,5-Br_(2))C_(6)H_(2)-o-C(H)=N-Ar]Ni(PPh_(3))(Ph)(6),[O-(3-t-Bu)C_(6)H_(3)-o-C(H)=N-Ar]Ni(PPh_(3))(Ph)(7))and bis-ligated Ni(II)complexes([O-(3,5-Br_(2))C_(6)H_(2)-o-C(H)=N-Ar]_(2)Ni(8),[O-(3,5-Br_(2))C_(6)H_(2)-o-C(H)=N-2-C_(6)H_(4)(PhO)]_(2)Ni(9),Ar=2,6-C_(6)H_(3)(i-Pr)_(2))were synthesized and characterized by Fourier transform infrared spectroscopy(FT-IR),nuclear magnetic resonance(NMR),mass spectrography(MS)and elemental analysis(EA).In the presence of methylaluminoxane(MAO)as cocatalyst,all the nickel complexes exhibited high activities for the polymerization of methyl methacrylate(MMA)and syndiotactic-rich poly(methyl methacrylate)(PMMA)was *** complexes with less bulky substituents on salicylaldiminato framework possessed higher activities,while with the same salicylaldiminato,the mono-ligated nickel complexes showed higher catalytic activity than bis-ligated ones.

关键词： late transition metal catalyst methyl methacrylate polymerization salicylaldiminato nickel complexes methylaluminoxane syndiotactic structure

Synthesis and characterization of a sensitive and selective Fe^(3+) fluorescent sensor based on novel sulfonated calix[4]arene-based host-guest complex

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Chinese Chemical Letters 2022年第5期33卷 2469-2472页

作者： Ran Cen Ming Liu jihong lu Weifang Zhang Jingjing Dai Xi Zeng Zhu Tao Xin Xiao Key Laboratory of Macrocyclic and Supramolecular Chemistry of Guizhou Province Guizhou UniversityGuiyang 550025China

A novel fluorescent sensor was prepared from sulfonated calix[4]arene(SC4A)by the host-guest com-plexation method using the fluorescent dye rhodamine B(RB)as a structure-directing *** crystal structure of the host-guest complex(RB@(SC4A)_(3))was confirmed by X-ray diffraction studies while its performance and sensing mechanism for metal ion pollutants were characterized using fluorescence and nuclear magnetic resonance *** results showed that RB@(SC4A)_(3) had a triangular branch structure resulting from host-guest mediation of the interactions between the three SC4A host molecules and the three terminal groups of the guest molecule *** host-guest complex exhibited sensitive and selective sensing towards Fe^(3+)ions via a fluorescence quenching *** results indicated that RB@(SC4A)_(3) could be a promising sensitive and selective fluorescent sensor for metal ion pollutants *** also provided new insights into the synthesis of calixarene-based host-guest complex.

关键词： Calixarenes Rhodamine B Metal ions Fluorescence probe Host-guest chemistry

影响磺胺甲[口恶]唑-甲氧苄啶共晶形成的因素

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中国医药工业杂志 2024年第8期55卷 1114-1120,1128页

作者：陆纪宏范珊珊王强刘相奎沈裕辉浙江金华康恩贝生物制药有限公司浙江金华321016 中国医药工业研究总院上海医药工业研究院有限公司上海201203

药物共晶在改善难溶性药物溶解和溶出方面有广阔的应用前景。复方磺胺甲[口恶]唑片中含磺胺甲[口恶]唑和甲氧苄啶,这2种活性药物成分可能形成共晶。经过与标准样品对比,确定该现象存在于片剂中。该文继续探讨了制剂工艺中水分含量、压... 详细信息

药物共晶在改善难溶性药物溶解和溶出方面有广阔的应用前景。复方磺胺甲[口恶]唑片中含磺胺甲[口恶]唑和甲氧苄啶,这2种活性药物成分可能形成共晶。经过与标准样品对比,确定该现象存在于片剂中。该文继续探讨了制剂工艺中水分含量、压力和温度这3个因素对磺胺甲[口恶]唑-甲氧苄啶共晶形成的影响。结果显示,水分可诱导共晶形成;温度升高至128℃后才会形成共晶;压力对共晶的形成无影响。2种活性药物成分形成的共晶,晶体结构稳定,提高了片剂的抗压性。

关键词：磺胺甲[口恶]唑甲氧苄啶共晶复方磺胺甲[口恶]唑片抗菌药

Versatile zeolite overlayer on ZnO film enabling high-performance bilayer NO_(2) sensoring

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Nano Research 2024年第10期17卷 9193-9201页

作者： Tianshuang Wang Yiheng Li Dan Li Peng Sun Xiaowei Song Geyu lu jihong Yu State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin University2699 Qianjin StreetChangchun 130012China State Key Laboratory on Integrated Optoelectronics College of Electronic Science and EngineeringJilin University2699 Qianjin StreetChangchun 130012China International Center of Future Science Jilin University2699 Qianjin StreetChangchun 130012China

Bilayer structure with functional overlayer has been commonly adopted to resolve the issue of moisture poisoning in ***,the conventional overlayers always suffer from blocking access of gas molecules to sensing layer due to lacking porosity and deteriorated adsorption ***,taking advantages of the well-defined porous structure and hydrophobic nature of pure silica zeolite,we assembled an overlayer of Pd-PdO clusters-encapsulated mesoporous silicalite-1(MFI)zeolite(named M-S-1)on ZnO sensing layer,to prevent moisture poisoning,and enhance gas diffusion and adsorption *** inherent capability of MFI zeolite to incorporate monodispersed nanometric(ca.3 nm)Pd-PdO cluster in its void space is of great importance for the NO_(2) *** Pd-PdO@M-S-1 overlayer can attain negligible moisture interference to the ZnO layer without significantly altering the gas selectivity and baseline resistance,and enhance gas ***,the Pd-PdO@M-S-1/ZnO bilayer sensor can ultra-selectively(S_(nitrogen dioxide)/S_(interference gas)>4),and ultra-stably detect trace level of NO_(2)(9.5 ppb)at low temperature(370 K)under high levels of humidity(90%RH).This work exemplifies a next-generation solution to design bilayer sensors using zeolite overlayer for eliminating the humidity dependence of the gas-sensing properties.

关键词： zeolites metal clusters bilayer structure NO_(2)chemiresistor

In Situ Al_2O_3-TiB_2/Al-Cu Composite Fabricated by Reaction Pressing of TiO_2-Al-B-CuO System

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Journal of Materials Science & Technology 1996年第1期12卷 25-28页

作者： Zongyi MA jihong LI Yuxiong lu Xiaoguang NING and Jing BI(Lab. of Atomic Imaging of Solids, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, China) Lab. of Atomic Imaging of Solids Institute of Metal Research Chinese Academy of Sciences Shenyang 110015 China

The in situ formed Al2O3 and TiB2 particulates reinforced Al-3.3 wt pct Cu alloy composite hasbeen successfully fabricated by reaction pressing of TiO2, Al, B and CuO powders. The in situformed Al2O3 and TiB2 particulates with a size from 10 nm to 2 μm are unifOrmly distributedin the matrix. The composite has a tensiIe Strength of 482 MPa and an elastic modulus of103.3 GPa.

关键词： CuO TiO Al TiB

Two new phenolic amides from Allium chinense

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Chinese Herbal Medicines 2023年第4期15卷 603-606页

作者： Xiaoqing Li Shikai Yan jihong lu Rui Wang Xianpeng Ma Xue Xiao Yan Zhang Huizi Jin Department of Natural Product Chemistry School of PharmacyShanghai Jiao Tong UniversityShanghai 200240China Institute of Chinese Medicinal Sciences Guangdong Pharmaceutical UniversityGuangzhou 510006China Guizhou Jingcheng Pharmaceutical Co. Ltd.Guiyang 550200China

Objective: To isolate the phenolic amides from the dried bulbs of Allium chinense and investigate their myocardium protective ***: The chemical constituents were isolated and purified by combining with silica gel column,Sephadex LH-20 column, HPLC and other chromatography techniques. Their structures were elucidated by NMR techniques and mass spectrometry. The isolated compounds were evaluated to determine their protective effect for myocardium cells in ***: Two new phenolic amides, namely, alichinemide Ⅰ(1) and alichinemide Ⅱ(2), and six konwn amides were isolated from the dried bulbs of A. chinense. The structures of compounds 3–8 were identified as 3-indolcarbaldehyde(3), 1-(2-aminophenyl)urea(4), 2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole-3-carboxylic acid(5), N-trans-feruloyltyramine(6), N-trans-p-coumaroyltyramine(7), and N-(3,4-dimethoxyphenethyl) acetamide(8). Compound 3(50 μmol/L) showed significant inhibitory effect on the damage of H9c2 myocardial cells induced by H2O2in ***: Compounds 1 and 2 were new phenolic amides. Compound 3 could be one of the potential myocardium protective constituents of A. chinense.

关键词： alichinemideⅠ alichinemideⅡ Allium chinense 3-indolcarbaldehyde myocardium protective activities phenolic amides

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蓖麻挥发物与创伤诱导挥发物组成成分分析

林业科学 2006年第9期42卷 140-142页

作者：孙凡鲁继红东北林业大学林学院哈尔滨150040

Solid phase micro-extraction (SPME) technique was applied to extract the volatiles and wound-induced volatiles of Ricinus communis, the volatiles were isolated and identified by GC-MS. The main volatile from intact leaves of Ricinus communis was 3 kinds of different constitution of dibutyl phthalate (87.81%), and dibutyl phthalate has the highest content (61.73%); besides the main volatile, a small quantity of decanamine, N-butyl (5.11%) and morpholine,4-octadecyl (7.07%) were identified too. When the leaves were broken to pieces, more volatiles were isolated, and 8 kinds of wound-induced volatiles were identified, they are unsaturated hexyl ester、hexyl aldehyde and hexyl-ol mostly, among them 3-hexen-1-ol, acetate was the main component, with content of 92.28%.

关键词：蓖麻挥发物创伤诱导挥发物固相微萃取

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论商业新闻与和谐社会

当代传播 2006年第1期 11-12页

作者：吕继红周胜林上海商学院新闻传播学院教授200041 复旦大学新闻学院教授200041

一、和谐社会的宣传中，商业新闻空间很大，大有可为。商业的特点是流通，流通的结果是人际交流。商业的人际交流有许多关系要处理：生产者与供应商，供应商与消费者，商店经营者与顾客，还有服务业、维修业与顾客、消费者等等。这些关... 详细信息

一、和谐社会的宣传中，商业新闻空间很大，大有可为。商业的特点是流通，流通的结果是人际交流。商业的人际交流有许多关系要处理：生产者与供应商，供应商与消费者，商店经营者与顾客，还有服务业、维修业与顾客、消费者等等。这些关系处理不好，社会就不会和谐。因为商业涉及社会生活的面非常广，衣、食、住、行哪一样都离不开商业；商业牵涉的人特别多，可以说，凡是社会的人，都不能与商业无缘。商业新闻是以商业活动为内容的报道。因此，商业新闻的报道空间很大。

关键词：商业新闻社会生活和谐人际交流商业活动报道空间供应商消费者生产者经营者

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浅析桥梁混凝土裂缝原因及预防措施

智能建筑与工程机械 2019年第7期1卷 20-22页

作者：路继红甘肃顺达路桥建设有限公司甘肃兰州730000

桥梁施工建设过程中混凝土裂缝众多,常见裂缝包括温度裂缝、干缩裂缝、收缩裂缝、沉陷裂缝等,本文在分析以上裂缝产生原因的基础上提出了桥梁施工中混凝土裂缝的预防措施,如适当降低水泥用量、合理控制水泥材料规格、严格控制水灰比、... 详细信息

桥梁施工建设过程中混凝土裂缝众多,常见裂缝包括温度裂缝、干缩裂缝、收缩裂缝、沉陷裂缝等,本文在分析以上裂缝产生原因的基础上提出了桥梁施工中混凝土裂缝的预防措施,如适当降低水泥用量、合理控制水泥材料规格、严格控制水灰比、优化桥梁基坑位置及填充地基加固处理方法、采取科学的养护方法等。实践证明通过以上预防措施可减少桥梁混凝土裂缝的产生,提高桥梁工程的整体质量。

关键词：桥梁混凝土裂缝原因预防措施