共查询到20条相似文献，搜索用时 171 毫秒
1.
李秀华 《赤峰学院学报(自然科学版)》2011,(12):15-16
围绕分子自组装这一当代化学前沿领域,以（2,4,6）吡啶三酸作为有机配体,在水热条件下与过渡金属离子合成了一个新颖的配位聚合物． 相似文献
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《淮北师范大学学报》2016,(1)
以4-(3-吡啶基)苯甲酸(4,3-Hpybz)为配体与过渡金属离子镉(Ⅱ)配位合成一个新颖的过渡金属配合物[Cd(4,3-pybz)_2(H_2O)]?8.5H_2O(1).并通过红外、元素分析、热重及单晶X-衍射等对其进行表征.X-射线单晶衍射分析结果表明,配合物1为三重穿插的金刚石三维结构.配体4-(3-吡啶基)苯甲酸采用三齿配位模式即一个螯合羧基上两个氧原子和一个吡啶基上的氮原子与金属离子Cd(Ⅱ)配位.配合物1包含有游离的水分子占据空穴,但是热重和客体交换导致配合物1的骨架不可逆塌陷.固体荧光测试表明配合物1具有强烈荧光发射. 相似文献
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配位聚合物作为配位化学和无机化学的研究热点,近10余年来备受化学家和材料学家的关注,而目前国内无机化学实验教材体系中,很少有关于配位聚合物的教学内容。本文基于我们课题组关于多氮唑配体配位聚合物材料的研究成果,介绍由3,5-二乙基-1,2,4-三氮唑(DETRZ)配体和[Cu4I4]类立方烷簇构筑配位聚合物[Cu2I(DETRZ)]n的综合型实验教学设计。本综合型实验从三氮唑配体的设计合成与分离纯化出发,涵盖溶剂热合成方法,单晶数据收集,单晶结构解析,晶体结构绘图,X-射线粉末衍射分析,红外光谱表征,热重分析等内容,系统拓展了学生对当今无机化学和配位化学的前沿认知。本实验条件简单,结果可靠,涉及无机化学,有机化学,晶体学等多方面内容,取得了良好的教学效果。 相似文献
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林小英郑琴琴裴义山张丽琴梁壮玲张明珍 《福建工程学院学报》2017,(1):1-4
以硝酸钾为中心金属离子,1,4-苯二甲酸（H2BDC）、1,3,5-苯三甲酸（H3BTC）及混合物（H2BDC+H3BTC）为有机配体,N,N-二甲基甲酰胺（DMF）为溶剂,采用溶剂热法合成三种K-MOF晶体。通过X射线粉末衍射(PXRD)、红外光谱(FT-IR)、扫描电镜（SEM）及热重(TG)等方法对样品进行表征,考察不同配体对K-MOF的影响。结果表明:K+与H2BDC配位得到的长条状晶体,与H3BTC配位得到粉末状晶体,H2BDC与H3BTC同时存在时,K+优先与H3BTC配位得到粉末状晶体。K-MOF具有良好的热稳定性,在350℃内能保持结构的热稳定性。 相似文献
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李爽 《赤峰学院学报(自然科学版)》2013,(11):10-12
利用水热合成方法,以刚性羧酸配体烟酸或均苯四甲酸为第一配体,以柔性羧酸配体己二酸为第二配体,我们成功设计合成了2个结构新颖的稀土配位聚合物,[Sm(μ3-O)(nic)3(ad)0.5(H2O)](1),[Pr(nic)(ad).2H2O](2)(H4btec=1,2,4,5-均苯四甲酸;Hnic=烟酸;H2ad=己二酸)并通过元素分析、红外光谱、X射线单晶结构分析对标题配合物进行了表征.此外,我们还对标题化合物的热稳定性做了详细的分析. 相似文献
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首次合成了一种链式苯并酰胺配体N , N’ —双(2 - 羧基苯基) 草酸二酰胺. 其熔点为281 ℃, 对该配体进行了红外光谱测定, 用连续变化光度法在非水溶剂DMF 溶液中测定该配体和三种过渡金属离子Cu2 + 、Zn2 + 、Co2 + 所形成配合物的稳定常数. 实验表明, 配位情况类似低肽的配合物, 配位比为1∶1 , 稳定性顺序Cu2 + > Zn2 + > Co2 + 与Irving - Williams 顺序一致. 相似文献
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以柚皮素为配体与铜金属离子在乙醇溶液中配位,成功合成了柚皮素-铜配合物.利用傅里叶红外光谱仪(KBr压片)对柚皮素及其配合物进行了表征,探讨并优化了柚皮素与铜反应的最佳条件:物质的量之比为1∶1,反应温度为50℃,反应时间为4h,pH值为7.5. 相似文献
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《职教通讯(江苏技术师范学院学报)》2005,11(4)
多羧酸类化合物在配位聚合物的合成中是很有价值的配体之一.本文通过高锰酸钾氧化法意外地制备了2-甲基-3,5-吡啶二甲酸,它具有很好的三角形对称结构,是理想的配位体.对它的结构进行了红外和核磁共振结构表征,结果与目标结构能够较好地吻合. 相似文献
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本文综述了喹诺酮类抗菌药物金属配合物的合成、分类、结构、性质等方面的研究现状,展望了此类研究的发展趋势. 相似文献
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Walter Kaminsky 《浙江大学学报(A卷英文版)》2001,2(1):1-8
Metallocenes and other transition metal compounds comprise a new generation of single site catalysts for the production of
precisely designed polyolefins and engineering plastics. The discovery of metallocene methylalumoxane (MAO) catalysts has
opened a frontier in the area of polymer synthesis and processing. A great number of symmetric and chiral zirconocenes have
been synthesized to give isotactic, syndiotatic, isoblock, or stereoblock polymers with increased impact strength and toughness,
better melt characteristics or elasticity, and improved clarity in films. Cycloolefin copolymers (COC) and syndiotactic polystyrene
can be produced by metallocene catalysts. These are new types of polymers with special properties and a high potential as
engineering plastics. Norbornene-ethene copolymers are most interesting for technical uses because of the easily available
monomers. Due to different incorporation values of the cyclic olefin in the copolymer, the glass transition temperature can
vary over a wide range and reaches 180°C. 相似文献
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Imprinted polymers were prepared for selective removal of Cu（Ⅱ） ions from metal solutions. Three ion-imprinted polymers were synthesized with methacrylic acid （MAA）, acrylamide （AA） and N,N＇-methylenebisacrylamide （MBAA） respectively as the functional monomers, ethleneglycoldimethacrylate （EGDMA） as the cross-linking agent, 2,2＇- azobisisobutyronitrile （AIBN） as the initiator and Cu （Ⅱ） ion as the imprint ion. The template Cu （Ⅱ） ion was removed from the polymer by leaching with a liquid of a 1：1 volumetric ratio of HCl to ethylenediaminetetraacetic acid （EDTA）. The capacity and selectivity of Cu（Ⅱ） ion adsorption were investigated with the three imprinted polymers and their non-imprinted counterparts. The polymers have a maximum adsorption capacity at pH 7.0. The isotherm of their batch adsorption of Cu（Ⅱ） ions shows a Langmuir adsorption pattern. Imprinted polymers all have a much higher capacity and higher selectivity of Cu（Ⅱ） adsorption than nonimprinted ones. MAA polymer benefits the most from imprinting. Imprinted MAA polymer has the highest selectivity when used to rebind Cu （Ⅱ） ion from an aqueous solution in the presence of other metal ions. Ion imprinting can be a promising technique of preparing selective adsorbents to separate and preconcentrate metal in a medium of multiple competitive metal ions through solid phase extraction （SPE）. 相似文献
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Imprinted polymers were prepared for selective removal of Cu(II) ions from metal solutions. Three ion-imprinted polymers were synthesized with methacrylic acid (MAA), acrylamide (AA) and N,N'-methylenebisacrylamide (MBAA) respectively as the functional monomers, ethleneglycoldimethacrylate (EGDMA) as the cross-linking agent, 2,2'-azobisisobutyronitrile (AIBN) as the initiator and Cu (II) ion as the imprint ion. The template Cu (II) ion was removed from the polymer by leaching with a liquid of a 1:1 volumetric ratio of HCl to ethylenediaminetetraacetic acid (EDTA). The capacity and selectivity of Cu(II) ion adsorption were investigated with the three imprinted polymers and their non-imprinted counterparts. The polymers have a maximum adsorption capacity at pH 7.0. The isotherm of their batch adsorption of Cu(II) ions shows a Langmuir adsorption pattern. Imprinted polymers all have a much higher capacity and higher selectivity of Cu(II) adsorption than non-imprinted ones. MAA polymer benefits the most from imprinting. Imprinted MAA polymer has the highest selectivity when used to rebind Cu (II) ion from an aqueous solution in the presence of other metal ions. Ion imprinting can be a promising technique of preparing selective adsorbents to separate and preconcentrate metal in a medium of multiple competitive metal ions through solid phase extraction (SPE). 相似文献
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采用原位一步合成法合成3，5-二硝基水杨酸插层水滑石材料，用XRD、IR对合成的样品进行表征，并与水溶液中阴离子直接交换合成法进行比较。结果表明，采用上述两种方法在控制适当的反应条件下均能制备出相应的3，5-二硝基水杨酸插层水滑石，但相比之下，原位一步合成法明显具有合成时间短，步骤简单和节约能耗等优点。 相似文献
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在采用共沉淀法制备出结晶性良好层结构规整的Zn2Al-硝酸根水滑石和Zn2Al-碳酸根水滑石的基础上,分别探讨了以硝酸根型水滑石为前驱体用阴离子直接交换法和以碳酸根型水滑石为前驱体用焙烧复原法制备水杨酸根插层水滑石的方法,并与原位一步合成法制备水杨酸根插层水滑石的方法进行了比较,结果表明,采用上述方法在控制适当的反应条件下均能制备出相应的水杨酸根插层水滑石,但用原位一步合成法制备的样品其结晶性和层状结构明显较好.DTA的结果表明,由于主客体相互作用使水滑石层板和插入阴离子的热稳定性均得到明显改善. 相似文献
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It is difficult to directly dope europium complexes in gel because the excessive water or high acidic condition may lead to their decomposition. We prepared a novel homogeneous TiO2 gel containing Eu-phen complexes by using an in-situ synthesis method. The formation of Eu-phen complexes in sol-gel derived TiO2 was confirmed by luminescence excitation spectra. The effects of temperature and aging time on in-situ synthesis are discussed. The luminescence spectra of gel containing europium complexes were also compared with the pure Eu-phen complexes. 相似文献
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It is difficult to directly dope europium complexes in gel because the excessive water or high acidic condition may lead to their decomposition. We prepared a novel homogeneous TiO2 gel containing Eu-phen complexes by using an in-situ synthesis method. The formation of Eu-phen complexes in sol-gel derived TiO2 was confirmed by luminescence excitation spectra. The effects of temperature and aging time on in-situ synthesis are discussed. The luminescence spectra of gel containing europium complexes were also compared with the pure Eu-phen complexes. 相似文献
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综述了近年来苹果酸与金属配住形成超分子配合物的研究进展.对苹果酸根(malate)的配位特点及其配合物的合成方法和晶体结构进行简要介绍,并对今后此类超分子网络配合物结构研究的发展方向进行了展望. 相似文献
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研究浓缩型（正铵盐型）改良剂和有机型（有机酸型）改良剂在原位修复只受重金属Pb和Cd单独污染的土壤过程中的传质关系．对污染土柱浸泡,并通过分析其水浸取液中Pb、Cd的pH值变化、质量浓度变化来表征其迁移机制．研究结果表明：浓缩型改良剂和有机型改良剂都可以作为经济的重金属污染修复材料使用,但浓缩型改良剂比有机型改良剂修复效果好,修复效果稳定． 相似文献