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1.
1 INTRODUCTION Recently, the ternary or quaternary mixed anion complexes of cerium(III) containing 1,10-phenanthroline (phen) have attracted considerable attention due to their rich structural chemistry and appealing magnetic properties[1]. Panagiotopou… 相似文献
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1 INTRODUCTION During the past years, dicarboxylic acids have been widely used as one polydentate ligand invo- lved in various metal chelation reactions to form transition or rare earth metal complexes with inter- esting properties in material science[1] and biological systems[2]. For example, Kim Y and his coworkers focused on the synthesis of copper(II) complexes containing malonate and pyrazine ligands to study their magnetic property and electronic conducti- vity[3]. The importance o… 相似文献
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Introduction Molecules containing different kinds of metal ions play an important role in molecular magnetism.1-3 So considerable attention has been paid to synthesizing heteronuclear complexes.1-4 As a potential bridging ligand, thiocyanate can coordinate to a harder metal center and softer ones with N and S atoms respectively. The complexes of thiocyanate and representative hard acidFe(III) ions usually have a six-coordinate octahe-dral structure such as [Fe(SCN)n]3-n and (Bu4N)4[Ag2-F… 相似文献
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1INTRODUCTION In recent years,dicarboxylic acids have been wide-ly used as poly-dentate ligands involved in various metal chelation reactions to form transition or rare earth metal complexes with interesting properties in material science[1~3]and biological systems[4~7].For example,Kim,Y.and his coworkers focus on the syn-theses of copper(II)complexes containing ligands of malonate and pyrazine to study their electronic con-ductivity and magnetic property[8].The importance of Tr(II)/dic… 相似文献
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1INTRODUCTION Recently,cyano-bridged lanthanide-transition me-tal complexes have been extensively investigateddue to their potential applications as precursors in the preparation of rare earth orthoferrites,fluores-cent and magnetic materials[1].Various complexes of this system have been obtained in order to ex-plore the relations between structures and pro-perties by using different ligands,such as DMF,4,4?-bipy,and so on,to fill the coordination sites of lanthanide ions[2～9].But up to… 相似文献
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Jun Wei ZHAO Jing Ping WANG Jing Yang NIU School of Chemistry Chemical Engineering Henan University Kaifeng 《中国化学快报》2005,(12)
Polyoxometalates may be versatile inorganic building blocks for the construction of molecular-based materials. By means of their multiple coordination requirements and oxophilicity, lanthanide cations are suitable to link polyoxometalate building blocks to form new classes of materials with potentially useful magnetic and luminescent properties1-4. Peacock and Weakley studied the interactions between the [α-SiW11 O39]8? isomer and lanthanide cations5, and they reported that the [α-SiW11O39… 相似文献
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1INTRODUCTION There is currently considerable interest in the ra-tional design and controlled synthesis of metal-organic frameworks(MOFs)with unique structural motif on account of their promising applications as catalysts,gas storage,selective separation,sensor,ion exchange and magnetic materials[1,2].Particu-larly,the supramolecular architectures with helical structures have received much more attention over the past decades owing to their specific functions in biology.It is well recogn… 相似文献
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1 INTRODUCTION Because the rare earth metal complexes have promoting function to the growth of animals and plants[1] and many other biological activities[2～5], such as antiinflammation, antibacterium, anticoagu- lantion and anticaner, the investigation … 相似文献
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1 INTRODUCTION The binding of metal ions by proteins and pep- tides is of fundamental interest due to the impor- tance of metal ions in biological systems. Metals may be part of the active sites of enzymes, stabilize the macromolecular structure of proteins and affect enzymes or membranes to control cell metabolism[1]. Therefore, for many years there has been a great in- terest in the study of complexes able to mimic these active sites of metalloproteins. In this case, metal complexes of… 相似文献
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1 INTRODUCTION Crystal engineering and the design of solid-state architectures have recently become areas of increasing interest[1, 2]. Such crystal engineering may afford new materials with useful properties such as catalytic activity, micro-porosity, nonlinear optical activity, cooperative magnetic behavior and so on. Polynitrile-ligand is one of the ideal multi-functional ligands for crystal engineering and many complexes with polynitriles as ligands have been found to show the spe… 相似文献
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Synthesis and Crystal Structure of a One-dimensional Azido-bridged Manganese (II) Compound [Mn(N_3)_2(H_2O)_3·C_6H_(12)N_4]_n 总被引：1，自引：1，他引：1
1 INTRODUCTION The azide anion is a good bridging ligand for di- valent metal ions to form discrete, one-dimensional, two-dimensional or three-dimensional complexes. In recent years, these complexes have drawn consider- able attentions for their interesting magnetic charace- ristics which attribute to the efficient magnetic coup- ling ability of the azido bridges[1]. When the azide anion acts as a bridging ligand, two typical modes are adopted: end-to-end (EE, μ1, 3) or end-on (EO, μ1… 相似文献
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WANG Shu-Pinga GAO Dong-Zhaoa LIAO Dai-Zhenga JIANG Zong-Huia② YAN Shi-Pinga LI Li-Cuna b a 《结构化学》2006,(2)
1 INTRODUCTION Pyridyl-substituted nitroxide radicals have at- tracted considerable attention in recent years due to the ability to coordinate with metal ions and act as magnetic couplers, giving rise to new functional ma- terials with particular magnetic and optical prope- rties as well as a variety of structural topologies[1~3]. Considerable efforts have been made in designing and preparing multi-dimensional materials with app- ropriate bridges, such as pseudohalide, dicyanide, dicyanoa… 相似文献
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1 INTRODUCTION In recent years, cyano-bridged heterometallic coordination compounds have inspired remarkable attention due to their rich and interesting structures and magnetic behaviors. However, these studies were mainly focused on the transition metals. Although several unusual cyanide bridging lanthanide-transition metal complexes have been re- ported[1～6], this field continuously possesses tre- mendous researching potentialities. As regardsPrussian Blue lanthanide complex, divers… 相似文献
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WANG Jun ** ZHANG Xiang dong JIA Wei guo LI Hui fang Department of Chemistry Liaoning University Shenyang P. R. China 《高等学校化学研究》2003,19(2)
IntroductionBecause the rare earth metal compounds havethe promotion to the growth of animals andplants[1] ,and the functions of antiinflammation,antibacterium[2 ] ,anticoagulantion[3 ] and anti-caner[4] ,the investigation on the syntheses and bio-logical activities of the rare earth metal compoundshas attracted many chemists attention.The com-pounds of heavy rare earth element Yb are consid-ered as the representative of these rare earth metalcompounds.Otherwise,the radioactive rare earthmetal… 相似文献
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1 INTRODUCTION Recently construction of new coordination poly-mer networks through the rational combination oforganic ligands ‘spacers’and metal ‘nodes’ is an areaof intense interest[1～3] because of their capability ofshowing novel magnetic[4], nonl 相似文献
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1 INTRODUCTION Metal-organic coordination polymers are currently of considerable interest and importance because they can be used as new functional materials applicable in adsorption, luminescent and NLO materials fields[1, 2]. Due to the manifold N- and O-donors of pyridine- (bi)carboxylic ligands, metal pyridine-(bi)carboxyla- tes can construct versatile structural motifs, which finally aggregate to generate various supramolecular architectures with interesting properties[3, 4]. The d… 相似文献
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WEN Yi-Hang ZHANG Jian QIN Ye-Yan LI Zhao-Ji KANG Yao CHEN Yu-Biao CHENG Jian-Kai YAO Yuan-Gen② 《结构化学》2004,(9)
1 INTRODUCTION The increasing interest in inorganic-organic hybrid framework assemblies has resulted in a great number of research efforts focused on the develop- ment of new functional materials possessing various potential applications on catalysis, electrical conduc- tivity and magnetism[1～4]. In recent years, the inter- action of H2pdc with several metal ions has been extensively studied[5, 6] due to its unique ability to form stable chelates in diverse coordination modes such as bid… 相似文献
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1 INTRODUCTION A great deal of interest in transition metal com- plex assembly has recently been devoted to the development of rational synthetic routes to novel one-, two- and three-dimensional crystal frameworks, due to their potential applications in… 相似文献
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1 INTRODUCTION Organic-inorganic hybrid materials and polyoxo-metalates have received much attention because of their intriguing structural diversity and potential applications in molecular adsorption, ion exchange, heterogeneous catalysis and nanotech nology as well as in electrical, magnetic and photochemical areas[1, 2]. One of the important ad- vances in the design of new organic-inorganic hybrid materials is utilizing poly- oxometalates’ coordination ability to produce poly- oxoanio… 相似文献
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ZHANG Shu-sheng LI Xue-mei WANG Jin-li WAN Jun JIAO Kui **College of Chemistry Molecular Engineering Qingdao University of Science Technology Qingdao P.R. China 《高等学校化学研究》2004,(2)
IntroductionMetal dialkyl dithiophosphates( dtp) and theirderivatives have been extensively employed both asantioxidantand antiwear additives in rubber and aslubricating oils[1,2 ] . The ligands or the metal inthese complexes can be varied according to people′sdesire and in an easily controlled manner to facili-tate the individual application,thus providing easyaccess to the understanding of details on DNA-bonding and its cleavage[3—5] .Bis( dialkyl dithiophosphate) disulfides arehighly eff… 相似文献