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1.
在溶剂热条件下合成并表征了2个基于2,2''-联苯甲酸(H2dpa)和1,4-二(1-苯并咪唑基甲基)苯(bbix)的配位聚合物:[Cu2(bbix)(dpa)2(C2H5OH)2]n1),{[Cd(bbix)0.5(dpa)]·0.5H2O}n2)。两者均显示二维结构。1中含有Cu-dpa螺旋链,bbix进而将螺旋链连接形成以Cu(Ⅱ)离子为3-连节点的63波浪状网格。而在配合物2中,dpa2-与Cd(Ⅱ)形成四-元环和八-元环交替连接而成的带状一维链,并由bbix连接得到二维网格。此外,还研究了12的热稳定性以及室温下2的荧光性能。  相似文献   

2.
在水热条件下利用H4ddb配体合成了3个过渡金属配合物[Co2(ddb)(phen)2(H2O)6]·3H2O(1),[Co(ddb)0.5(bpy)0.5(H2O)3]n2)和{[Ag(dpe)]·0.5(H2ddb)·H2O}n3)(H4ddb=3,3'',4,4''-四羧基偶氮苯,bpy=4,4''-联吡啶,dpe=1,2-二(4-吡啶基乙烯)),并用元素分析、红外光谱、X射线粉末衍射、X射线单晶衍射对其进行了表征。配合物1为双核结构,基于丰富的氢键作用扩展形成三维超分子网结构。配合物2为基于钴离子通过ddb4-配体以μ4η1,η1,η1,η1的配位模式连接而成的二维网结构。配合物3是由Ag(Ⅰ)离子与dpe配体形成的直链结构,客体分子H2ddb2-通过氢键作用将其扩展为三维超分子结构。此外还研究了配合物1~3的荧光性质和热稳定性。  相似文献   

3.
设计合成了3种新颖的金属有机配合物(MOCs):{[Pb2(HL)(phen)]·2H2O}n1),{[Ni(H3L)(4,4''-bipy)1.5(H2O)4]·6H2O}n2)和{[Ni2(HL)(1,4-bibb)(H2O)]·(CH3CN)·H2O}n3)(H5L=3,5-二(2'',5''-苯二羧酸)苯甲酸,phen=1,10-菲咯啉,4,4''-bipy=4,4''-联吡啶,1,4-bibb=1,4-二(苯并咪唑)苯),并通过单晶X射线衍射、红外光谱(IR)、热重分析(TG)和粉末衍射对它们进行结构表征。结构分析表明1是基于[Pb2μ2-COO)2μ1-COO)4]SBUs的一维链状结构;2是二维层状结构,其拓扑符号为{4.62}2{42.62.82};3是一个3D网络结构,其拓扑符号为{62.84}{64.82}2。进一步研究了配合物荧光和磁性能。荧光检测显示,配合物1在水溶液中可以高灵敏识别Fe3+和Cr2O72-离子。同时研究了配合物1对Fe3+和Cr2O72-猝灭机理。磁性分析表明配合物3中的Ni(Ⅱ)离子之间存在反铁磁相互作用。  相似文献   

4.
以2-(4''-羧基苯基)咪唑-4,5-二羧酸(H4CPhIDC,C12H8N2O6)为配体,用溶剂热合成了3种配位聚合物{[Cd2(CPhIDC)(bimb)]·H2O}n1)、{[Cd2(CPhIDC)(phen)2]·3H2O}n2)、{[Zn2(CPhIDC)(bpp)]·1.5H2O}n3)(bimp=1,4-双咪唑基-丁烷,phen=1,10-菲咯啉,bpp=1,3-双(4-吡啶基)-丙烷)。用元素分析、红外光谱、粉末X射线衍射和单晶X射线衍射对配合物进行了表征和结构分析。结构分析表明,主配体以完全去质子化CPhIDC4-的形式与中心金属离子形成以μ4μ5为配位模式的二维及三维聚合物。配合物13是三维网络结构,同时呈现(3,4,5)-连接的(5·6·7)(4·52·6·72)(4·52·6·74·82)拓扑结构,两者的不同之处是中心离子和辅助配体。配合物2是二维波纹状渔网结构,呈现44·62拓扑结构,在其空间填充上又类似于DNA双螺旋链的单螺旋结构。测定了产物的固体荧光光谱;用EtBr荧光探针法研究了配体及配合物与ct-DNA的相互作用。  相似文献   

5.
通过设计柔性配体1,5-二(2-乙基苯并咪唑基)戊烷(bep),在二羧酸辅助配体的调控下成功制备了3个配位聚合物[Cd(bep)(sba)]n1),[Cd(bep)(bda)]n2),and{[Cd2(bep)(ada)2]·H2O}n(3)(H2sba=4,4’-磺酰基二苯甲酸,H2bda=4,4’-联苯二甲酸,H2ada=1,3-金刚烷二乙酸)。配合物均呈现二维层状结构。配合物1由交替的Cd(Ⅱ)/bep/sba2-螺旋链构成。配合物2由Cd/bda2-单元构成二维结构,bep作为单齿配体与Cd(Ⅱ)配位。配合物3的二维层通过Cd/ada2-/H2O氢键螺旋链拓展成三维超分子。此外,对配合物1~3的粉末X射线衍射、热稳定性以及荧光性质进行了研究。  相似文献   

6.
通过设计柔性配体1,5-二(2-乙基苯并咪唑基)戊烷(bep),在二羧酸辅助配体的调控下成功制备了3个配位聚合物[Cd(bep)(sba)]n1),[Cd(bep)(bda)]n2),and{[Cd2(bep)(ada)2]·H2O}n3)(H2sba=4,4’-磺酰基二苯甲酸,H2bda=4,4’-联苯二甲酸,H2ada=1,3-金刚烷二乙酸)。配合物均呈现二维层状结构。配合物1由交替的Cd(Ⅱ)/bep/sba2-螺旋链构成。配合物2由Cd/bda2-单元构成二维结构,bep作为单齿配体与Cd(Ⅱ)配位。配合物3的二维层通过Cd/ada2-/H2O氢键螺旋链拓展成三维超分子。此外,对配合物1~3的粉末X射线衍射、热稳定性以及荧光性质进行了研究。  相似文献   

7.
在水热条件下,以3,5-二((4''-羧基苄基)氧)苯甲酸(H3bcb)和4''-(4-吡啶基)-2,2'':6'',2"-三联吡啶(PYTPY)为混合配体构筑了2个过渡金属配合物[Co(H2bcb)2(PYTPY)]n1)和[Mn(H2bcb)2(PYTPY)]n2),利用元素分析、红外光谱以及单晶X射线衍射表征其结构。分析表明配合物12为一维链状结构。此外,2个配合物展示了优良的热稳定性。磁化率的测试结果表明,配合物12在2 K和8 K以下时展示了反铁磁相互作用。  相似文献   

8.
设计、合成了2个配合物:{[Co2(pddb)2μ2-H2O)(H2O)2]·2DMA·5H2O}n1)和{[Ni2(pddb)2μ2-H2O)(H2O)2]·2DMA·5H2O}n2)(H2pddb=3,3''-(吡啶-3,5)二苯甲酸,DMA=N,N-二甲基乙酰胺),并通过红外光谱(IR),元素分析,热重分析(TG)和单晶X射线衍射确定它们的结构。结构分析表明12是异质同构的,其空间构型可简化成(3,6)连接的拓扑结构,其符号为(42·6)·(44·62·88·10)。进一步研究了配合物12的固体紫外、磁性及其催化性能。研究表明12中的中心金属离子之间存在反铁磁耦合作用,并且1可以作为C-H活化的高效非均相催化剂。  相似文献   

9.
水热法合成了2个配合物{[Cu2(L)2(tp)]·2H2O}n (1)和[CuL(ClO4)]n (2)(L=4-羧酸-2,2'':6'',2"-三联吡啶,H2tp=对苯二甲酸)。对其晶体结构进行了分析,结果表明配合物12都通过配体和金属离子组装成一维链结构;配合物1属于三斜晶系,P1空间群,并通过链间的氢键作用形成三维的网状结构;配合物2通过链与链间的氢键作用形成二维的层状结构。对其热稳定性和荧光性质进行了研究。  相似文献   

10.
使用3,3''-硫代二丙酸、4,4''-联吡啶和硝酸锰在水热条件下反应合成了1个锰配合物,即{[Mn(DPA)(4,4''-bipy)]·H2O}n1)(DPA=3,3''-硫代二丙酸,4,4''-bipy=4,4''-联吡啶);然后又利用3,3''-硫代二丙酸、1,3-双(4-吡啶基)丙烷和硝酸铜在水热条件下反应合成了1个铜配合物,即{[Cu(DPA)(bpp)(H2O)]·H2O}n2)(DPA=3,3''-硫代二丙酸,bpp=1,3-双(4-吡啶基)丙烷)。并对它们分别进行了元素分析、红外光谱、热稳定性、X射线粉末衍射和X射线单晶衍射的表征。结果表明:配合物12分别由3,3''-硫代二丙酸配体和不同氮杂环分子以及金属离子构筑,形成了二维层状的结构。氢键和π-π作用进一步将二维结构拓展成三维超分子网络。  相似文献   

11.
多环芳二酐型聚酯亚胺膜的透气性能李悦生,丁孟贤,徐纪平(浙江大学高分子科学与工程研究所,杭州,310027)(中国科学院长春应用化学研究所)关键词聚醚酰亚胺,聚酯酰亚胺,膜,透气性通常的聚酰亚胺加工性能较差,在芳环二酐的苯环间引入醚键等柔性基团后,其...  相似文献   

12.
A QuEChERS (quick, easy, cheap, effective, rugged, and safe) method for the determination of benazolin-ethyl and quizalofop-p-ethyl in rape and soil by high-performance liquid chromatography-tandem mass spectrometry has been developed in this study. The residue and dissipation of benazolin-ethyl and quizalofop-p-ethyl in rape and soil were determined with the developed method. The half-lives of benazolin-ethyl in rape straw and soil were 3.7–5.1 days and 14.3–26.3 days, respectively. The half-lives of quizalofop-p-ethyl in rape straw and soil were 5.0-6.1 days and 0.3–9.7 days, respectively. The residue of benazolin-ethyl and quizalofop-p-ethyl in rapeseed and soil were below the detection limit (i.e., 0.5?mg?kg?1, the maximum residue level of European Union for quizalofop-p-ethyl).  相似文献   

13.
微量元素与疾病诊断治疗的研究现状及展望   总被引:8,自引:0,他引:8  
对国内外微量元素与疾病的关系及其诊断治疗的研究现状及研究动向进行了综述,包括:微量元素与地方病、癌肿、心血管病、糖尿病、眼病、神经系统病等。参考文献72篇。  相似文献   

14.
15.
Herein, we present the synthetic route and the photophysical, electrochemical as well as laser properties of novel red‐emitting boron‐dipyrromethenes (BODIPYs) bearing arylethyne moieties. Such functionality is added along the main axis of the chromophore leading to single‐ and double‐substituted derivatives. The relationship between the dye structure and the lasing properties is studied in detail with the help of the photophysical and electrochemical properties as well as quantum mechanical simulations. The asymmetric substitution of the parent dye induces inhomogeneities in the charge distribution, which leads to an overall loss of the fluorescence capacity, mainly in polar media. Such non‐radiative deactivation processes can be softened by decreasing the electron‐donor ability of the substituent or even avoided by symmetrical substitution. Thus, grafting of the arylethyne moieties at the longitudinal axis of the indacene core results in an effective strategy to develop red‐edge BODIPYs with highly efficient and photostable laser emission.  相似文献   

16.
朱劲波  马立群  梁飞  苗迎春  王立民 《应用化学》2015,32(11):1221-1230
Ti-V基储氢合金在室温、常压下即可表现出良好的储氢特性,且质量储氢容量明显高于传统AB5型储氢合金,从而在氢气的精制和回收、运输和储存及热泵等方面有较早的应用。 此外,在混合气体分离、核反应堆中处理氢的同位素、镍氢电池及燃料电池负极材料等方面也得到了广泛的研究与关注。 基于目前Ti-V基储氢合金的研究现状,概述了该类合金的优势、限制性因素(包括成因)及改性手段。 此外,为了进一步理解Ti-V基合金储氢机理、构建合金组分与储氢特性之间的对应关系,本工作重点围绕Ti-V基储氢合金及其氢化物的结构、组分优化设计展开综述,并对其未来研究方向做出展望。  相似文献   

17.
钒与糖代谢及糖尿病   总被引:1,自引:0,他引:1  
微量元素钒作为生物体内必需元素,经证实有很重要的生理学功能,与机体糖代谢有十分密切的关系,且能降低糖尿病动物模型的高血糖,极有可能被开发为治疗糖尿病的药物。  相似文献   

18.
In this work, ferrocene- and ferrocenium-containing salts were employed to modify montmorillonite. X-ray measurements show an increase in the interlayer spacing upon clay modification, which means that the larger and more organophilic cations were inserted into the gallery space of montmorillonite. Attempts to prepare nanocomposites of polystyrene and ethylene vinyl acetate copolymers lead to immiscible systems; the morphology of these systems was elucidated with TEM, XRD and cone calorimetry. The thermal stability of the composites is greater than that of the virgin polymer.  相似文献   

19.
Tyrosol (T) and hydroxytyrosol (HOT) and their glycosides are promising candidates for applications in functional food products or in complementary therapy. A series of phenylethanoid glycofuranosides (PEGFs) were synthesized to compare some of their biochemical and biological activities with T and HOT. The optimization of glycosylation promoted by environmentally benign basic zinc carbonate was performed to prepare HOT α-L-arabino-, β-D-apio-, and β-D-ribofuranosides. T and HOT β-D-fructofuranosides, prepared by enzymatic transfructosylation of T and HOT, were also included in the comparative study. The antioxidant capacity and DNA-protective potential of T, HOT, and PEGFs on plasmid DNA were determined using cell-free assays. The DNA-damaging potential of the studied compounds for human hepatoma HepG2 cells and their DNA-protective potential on HepG2 cells against hydrogen peroxide were evaluated using the comet assay. Experiments revealed a spectrum of different activities of the studied compounds. HOT and HOT β-D-fructofuranoside appear to be the best-performing scavengers and protectants of plasmid DNA and HepG2 cells. T and T β-D-fructofuranoside display almost zero or low scavenging/antioxidant activity and protective effects on plasmid DNA or HepG2 cells. The results imply that especially HOT β-D-fructofuranoside and β-D-apiofuranoside could be considered as prospective molecules for the subsequent design of supplements with potential in food and health protection.  相似文献   

20.
The monomeric ν(N—H) vibrations of various trisubstituted ureas of the R2UPh type and -thioureas of the R2TUPh type have been studied. The trans—out isomerism in the former and the trans—out—cis isomerism in the latter are discussed from the point of view of steric effect. The monomeric ν(N—H) vibrations of RPhUPh and RPhTUPh are also examined. The single band appearing in the spectrum of both ureas is characteristic of the cis form; this suggests the existence of phenyl—phenyl interaction (the stacking interaction proposed by Galabov et al. [10]). Behavior of ν(N—H) vibrations at several concentrations is shown to be clearly different in the three forms (trans, out and cis). The presence of the cis form is confirmed by solvent effect experiments.  相似文献   

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