共查询到19条相似文献,搜索用时 62 毫秒
1.
由2-硝基-1, 4-对苯二甲酸和4, 4'-联吡啶作为起始原料合成了4个金属银的配位聚合物, {[Ag(4, 4'-bipy)]·2-Hnbdc·2H2O ·CH3OH}n (1), {[Ag(4, 4'-bipy)(2-Hnbdc)]}n (2), {[Ag2(4, 4'-bipy)2(2-nbdc)]·2H2O}n (3), 和{[Ag2(4, 4'-bipy)2(2-nbdc)(H2O)]·2H2O}n (4)。通过IR、元素分析、TG、UV和荧光光谱以及粉末衍射等手段, 对配合物进行了表征和性质研究。单晶衍射分析显示, 配合物1为1D阴-阳离子型聚合物, 配合物2为1D双链结构, 且结构中不存在溶剂分子。配合物3和4均为1D链状结构。结构的多样性主要是由配体构象、硝基对苯二甲酸的配位模式以及弱作用(如π-π堆积、Ag…Ag作用以及氢键等)导致的。结构的不同也使得它们的稳定性、紫外吸收以及荧光光谱存在着差异。 相似文献
2.
以2,4-二氯苯氧乙酸、2,2'-联吡啶、4,4'-联吡啶和硝酸银为原料,采用自然挥发法制备了2个配合物{[Ag2(ELBA)(4,4'-bipy)2(NO3)]·2H2O}n (1)和[Ag2(ELBA)2(2,2'-bipy)]n (2)(ELBA=2,4-二氯苯氧乙酸,4,4'-bipy=4,4'-联吡啶,2,2'-bipy=2,2'-联吡啶),并对其进行了元素分析、红外光谱、热稳定性和X-射线单晶衍射的表征,研究了配合物2的荧光性质。结果表明,配合物1和2均为一维结构,其中,配合物1是通过4,4'-联吡啶和银离子间的作用形成梯状结构;而配合物2是通过Ag…Ag作用构筑S状结构。配合物中存在氢键和π-π堆积等弱的分子间作用力。 相似文献
3.
以2,4-二氯苯氧乙酸、2,2'-联吡啶、4,4'-联吡啶和硝酸银为原料,采用自然挥发法制备了2个配合物{[Ag2(ELBA)(4,4'-bipy)2(NO3)]·2H2O}n(1)和[Ag2(ELBA)2(2,2'-bipy)]n(2)(ELBA=2,4-二氯苯氧乙酸,4,4'-bipy=4,4'-联吡啶,2,2'-bipy=2,2'-联吡啶),并对其进行了元素分析、红外光谱、热稳定性和X-射线单晶衍射的表征,研究了配合物2的荧光性质。结果表明,配合物1和2均为一维结构,其中,配合物1是通过4,4'-联吡啶和银离子间的作用形成梯状结构;而配合物2是通过Ag…Ag作用构筑S状结构。配合物中存在氢键和π-π堆积等弱的分子间作用力。 相似文献
4.
在水热条件下,以N-氧化-2-吡啶膦酸(H2L)为主配体,4,4’-联吡啶(bpy)为桥联配体,合成了3个铜有机膦酸配合物:{[Cu(L)(bpy)0.5(H2O)]·2H2O}n(1),{[Cu(HL)2(bpy)]·4H2O}n(2)和{[Cu2(L)2(bpy)]·3H2O}n(3)。配合物1中,相邻的铜离子由2个膦酸根连成二聚体,二聚体之间通过bpy桥联成一维链。配合物2中,单核[Cu(HL)2]被bpy连接成一维链。配合物3中,四聚体[Cu2(L)2]2被bpy连接成“砖块状”结构的二维层。磁性研究表明,配合物1和3中铜离子之间存在反铁磁性耦合。 相似文献
5.
通过使用一个半刚性的多齿羧酸配体3,3',3"-(((2,4,6-trimethylbenzene-1,3,5-triyl)tris(methylene))tris(oxy))tribenzoic acid (H3L),在溶剂热条件下合成了4个配位聚合物{[Cd3(L)2(H2O)2]·5DMF·6H2O}n (1),{[Co3(L)2(H2O)2]·2DMF·6H2O}n (2),{[Mn3(L)2(H2O)2]·3DMF·6H2O}n (3),{[Zn3(L)2(H2O)2]·5DMA·5H2O}n (4),并通过X射线单晶衍射,热重分析对配合物结构进行了表征。4个化合物都是同构的,由沙漏型的M3簇和L3-配体作为次级结构单元,从而给出了一个金属-有机纳米笼的三维结构,从拓扑学的观点看,4个配合物的结构可以看作是三节点的(3,3,6)-连接的网络。荧光光谱测试表明配合物1和4在激发波长为272 nm下,在385 nm处显示了强的宽发射峰。荧光传感测试结果表明,配合物1是一种潜在的硝基苯类化合物的传感材料。 相似文献
6.
合成了2个配位聚合物{[Cd(btaa)(phen)(CH3COO)]·H2O}n(1)和{[Ag2(btaa)(4,4-bpy)2](NO3)·2H2O}n(2)(Hbtaa=1H-苯并三氮唑-1-乙酸,phen=1,10-邻菲啰啉,4,4-bpy=4,4-联吡啶),采用单晶X-射线、红外光谱、元素分析和热重分析对配合物进行了表征。配合物1中的镉离子通过1H-苯并三氮唑-1-乙酸根桥连成一位螺旋链状结构。在配合物2中,银离子被4,4-联吡啶连接成一维链状结构,这些一维链通过1H-苯并三氮唑-1-乙酸根桥连以及Ag···Ag作用和π-π堆积连接成一维梯子状结构。此外,还研究了配合物1的荧光性质。 相似文献
7.
以同物质的量比例的4-二苯基乙酸(Hbpa)、1,3-二(4-吡啶基)丙烷(bpp)和[Ag(NH3)](OH),在不同反应条件下制备了2个基于柔性配体的类三明治配合物[Ag2(bpa)2(bpp)2]·2H2On(1)和[Ag(bpa)(bpp)]·2H2On(2),对其进行了单晶结构、元素分析、红外光谱、荧光光谱和粉末衍射表征。结构表明1是由T型配位的银离子和Ag…Ag超分子作用组装而成的二维配合物;配合物2则是由四面体构型银离子和π…π堆积作用组装的二维配位超分子。此外,1和2还可在可见光区的不同位置发射较强荧光。 相似文献
8.
以5-甲基-3-吡唑甲酸(H2MPCA)为主配体,桥联配体4,4’-联吡啶(4,4’-bpy)和吡嗪(pyz)为辅助配体,合成了2个新的配合物{[Co(HMPCA)2(4,4’-bpy)]2·5H2O}n(1)和{[Ni(HMPCA)2(pyz)]·5H2O}n(2),并用元素分析、红外光谱、X射线单晶衍射结构分析、热重分析等对其进行了表征。配合物1属于正交晶系,空间群为Pccn,配合物2属于单斜晶系,空间群为P2/c。在1和2中,金属离子都位于一个扭曲的八面体配位环境中,分别由4,4’-联吡啶(1)和吡嗪(2)两端的氮原子桥联2个相邻的金属离子,形成一维链状聚合物。考察了配合物1和2的热稳定性、荧光性能和磁性。 相似文献
9.
通过水热法得到了2个配位聚合物{[Cd(L)(oba)]·3.5H2O}n(1)和{[Cd(L)2](p-bdc)}n(2)(L=4,4’-二(1-咪唑基)苯砜,H2oba=4,4’-联苯醚二甲酸,p-H2bdc=对苯二甲酸),对它们进行了元素分析、红外光谱分析,并利用X射线衍射测定了它们的单晶结构。晶体结构分析表明,配合物1具有四连接二重穿插的三维网络结构,其拓扑为{65·8}。配合物2具有四连接的二维结构,其拓扑为{44·62}。此外,在室温下对2个配合物进行了荧光分析。 相似文献
10.
利用联苯四羧酸(H4bptc)和双三唑乙烷(bte)合成了2个配位聚合物{[Zn2(bptc)(DMF)2(H2O)]·DMF·H2O}n (1)和{[Zn(bte)(bptc)0.5]·DMF·0.5H2O}n(2).化合物1为三维PtS-拓扑结构,在该配合物中每个双核次级构筑单元(SBU){Zn2(O2CR)4}与4个联苯四酸配体相连,从而将配合物构筑成了三维MOF结构.化合物 2 为二维梯形结构,并通过弱氢键O…H-C将二维层连接为三维结构.同时对配合物的热稳定性和荧光特征进行了讨论. 相似文献
11.
To investigate the relationship between network connectivity and metal nuclearity, we designed and synthesized a series of three-dimensional (3D) entangled coordination frameworks based on different metal cores, namely [Zn(2)(bdc)(2)(L)(2)]2H(2)O (1), [Zn(bdc)(L)(0.5)] (2), [Zn(oba)(L)(0.5)] (3) and [Cd(3)(bdc)(3)(L)(2)(H(2)O)(2)] (4) by self-assembly of d(10) metal salts with the flexible long-chain ligand 1,4-bis(1,2,4-triazol-1-yl)butane (L), and with the rigid and nonrigid aromatic dicarboxylate ligands 1,4-benzenedicarboxylate (bdc) and 4,4'-oxybis(benzoate) (oba). Compound 1 exhibits a threefold interpenetrated diamondoid array typically based on a tetrahedral second building unit (SBU) at a single Zn center. Compound 2 adopts a threefold interpenetrated alpha-polonium-type network that is built from bimetallic cores as six-connected vertices. The structure of 3 also consists of dinuclear units; it comprises a novel (3,4)-connected threefold interpenetrated net with complex (4610)(46(2)10(3)) topology when single zinc centers act as four-connected nodes (or the alpha-Po topology if dinuclear units are considered as six-connected nodes). Compound 4, derived from a crosslinked fivefold interpenetrated diamond-like substructure, is an unusual example of a self-penetrating coordination framework displaying an unprecedented eight-connected 4(20)6(8) topology with trinuclear cadmium clusters as eight-connected nodes which, to our knowledge, not only defines a new topology for eight-connected coordination networks, but also represents the highest connected topology presently known for self-penetrating systems. Detailed structural comparison of these complexes indicates that the increase in metal nuclearity induces the progressive increase in the connectivities of the ultimate nets: that is, the metal nuclearity plays a significant role in tuning the connectivity of a specific network. The thermal and luminescent properties of these compounds are discussed. 相似文献
12.
13.
具有可逆颜色变化和适当变色寿命的光致变色材料对于无墨水和可擦除打印技术十分重要。我们将1,4,5,8-萘四羧酸二酐与甲硫氨酸结合,设计了一种基于1,4,5,8-萘二酰胺(NDI)的桥联有机配体(H2ncm),并以Zn2+和H2ncm为原料,通过溶剂热反应合成了2种配位聚合物。化合物[Zn(ncm)(H2O)4]·2DMF (1)包含1个Zn2+、1个ncm2-配体、4个配位水分子和2个DMF分子。Zn2+处于八面体的配位环境中,并通过ncm2-配体连接形成链状结构。化合物[Zn2(ncm)2(H2O)4] (2)包含2个Zn2+、2个ncm2-配体和4个配位水分子。2个Zn2+原子通过2个羧基桥联形成双核结构,并进一步通过ncm2-配体连接形成二维层结构。2显示出从黄色到深棕色的光致变色现象。这种光诱导产生的颜色可以稳定至少3周,但在70 ℃加热时在5 min内即可恢复本来的颜色。我们证明了这种光致变色是源于光照射下NDI·自由基的产生。 相似文献
14.
The cellulose solvent Pd-en, an aqueous solution of [(en)Pd(II)(OH)(2)] (en=ethylenediamine), reacts with the monosaccharides D-arabinose (D-Ara), D-ribose (D-Rib), rac-mannose (rac-Man), and D-galactose (D-Gal) under formation of dimetalated aldose complexes, if the molar ratio of Pd and sugar is 2:1 or larger. In the Pd(2) complexes, the aldoses are tetra-deprotonated and act as bisdiolato ligands. Two crystalline pentose complexes were isolated: [(en)(2)Pd(2)(beta-D-Arap1,2,3,4 H(-4))].5 H(2)O (1) and [(en)(2)Pd(2)(beta-D-Ribp1,2,3,4 H(-4))].6.5 H(2)O (2), along with two hexose complexes. With rac-Man, the major solution species is crystallized as the 9.4-hydrate [(en)(2)Pd(2)(beta-rac-Manp1,2,3,4 H(-4))].9.4 H(2)O (3). From the respective D-Gal solutions, [(en)(2)Pd(2)(beta-D-Galf1,3,5,6 H(-4))].5 H(2)O.C(2)H(5)OH (4), with the sugar tetraanion in its furanose form, is crystallized though it is not the major species, rather the second most abundant in purely aqueous solutions. The Galf species is enriched in the mother liquors to the extent of 25 % of total sugar content. Substitution of the en ligand by two molecules of ammonia, methylamine, or isopropylamine, respectively, results in the formation of different solution species. With the bulkiest ligand, isopropylamine, monometalation of the aldoses in the 1,2-position is exclusively observed. 相似文献
15.
《Angewandte Chemie (International ed. in English)》2017,56(8):1994-2015
This Review showcases the ability of bi‐ and tridentate ligands to stabilize gold in high oxidation states through the formation of mono‐ and biscyclometalated gold(III) complexes. In‐depth studies on the synthesis, intrinsic reactivity, catalytic relevance, and photophysical properties of stabilized gold(III) species have been carried out, setting the stage for exciting developments in various research areas, such as catalysis, inorganic and bioinorganic chemistry, ligand design, and materials science. 相似文献
16.
Self‐assembly of Zn (II) or Cd (II) nitrates, flexible bis (pyridyl)‐diamine, as well as arenesulfonic acids, leads to the formation of ten coordination polymers, namely, [Zn(L1)(H2O)3]·2(p‐TS)·2H2O ( 1 ), [Zn(L1)(H2O)2]·2(p‐TS)·2H2O ( 2 ), [Zn(L1)2(p‐TS)2] ( 3 ), [Zn(H2L1)(H2O)4]·2(1,5‐NDS)·2H2O ( 4 ), [Zn(H2L2)(H2O)4]·2(1,5‐NDS)·4MeOH ( 5 ), [Cd(L1)(p‐TS)(NO3)]·H2O ( 6 ), [Cd(L1)(1,5 ‐NDS)0.5(H2O)]·0.5(1,5‐NDS)·H2O ( 7 ), [Cd(L2)(H2O)2]·(p‐TS)·(NO3)·3H2O ( 8 ), [Cd(L2)(1,5‐NDS)] ( 9 ) and [Cd(L2)(1,5‐NDS)]·MeOH ( 10 ) (L1 = N,N′‐bis (pyridin‐4‐ylmethyl) ethane‐1,2‐diamine, L2 = N,N′‐bis (pyridin‐3‐ylmethy l)ethane‐1,2‐diamine, p‐HTS = p‐toluenesulfonic acid, 1,5‐H2NDS = 1,5‐naphthalene disulfonic acid), which have been characterized by elemental analysis, IR, TG, PL, powder and single‐crystal X‐ray diffraction. Complexes 1 , 4 , 5 and 6 present linear or zigzag chain structures accomplished by the interconnection of adjacent M (II) cations through L1 ligands or protonated H2L12+/H2L22+ cations, while complexes 2 , 3 and 8 show similar (4,4) layer motifs constructed from the connection of M (II) cations through L1 and L2. The same coordination modes of L1 and L2 in complexes 7 and 9 join adjacent Cd (II) cations to form double chain structures, which are further connected by bis‐monodentate 1,5‐NDS2? dianions into different (6,3) and (4,4) layer motifs. The L2 molecules in complex 10 join adjacent Cd (II) cations together with 1,5‐NDS2? dianions to form 3D network with hxl topology. Therefore, the diverse coordination modes of the bis (pyridyl) ligand with chelating spacer and the feature of different arenesulfonate anions can effectively influence the architectures of these complexes. Luminescent investigation reveals that the emission maximum of these complexes varies from 374 to 448 nm in the solid state at room temperature, in which complexes 4 , 5 , 7 , 9 and 10 show average luminescence lifetimes from 7.20 to 14.82 ns. Moreover, photocatalytic properties of complexes 7–10 towards Methylene blue under Xe lamp irradiation are also discussed. 相似文献
17.
Four novel lanthanide coordination polymers [Pr(mal)(OH)(bipy) · 2H2O]n (1), {[Dy1(SBA)3(H2O)2][Dy2(SBA)3(H2O)2] · 4H2O}n (2), {[Tb(OHnic)(Onic)(H2O)5 · (OHnicH)] · H2O}n (3) and {[Sm(OHnic)(Onic)(H2O)5 · (OHnicH)] · H2O}n (4) (Hmal = maleic acid, HSBA = 4-sulfobenzoic acid, OHnicH = 6-hydroxynicotinic acid and bipy = 2,2′-bipyridine) have been synthesized and determined by single crystal X-ray diffraction. Complex 1 is a 1-D helical chain with seven-coordinated praseodymium centers. Complex 2 forms 1-D chain-like molecular structure containing two crystallographically unique dysprosium centers, the Dy1 center is seven-coordinated while Dy2 is eight-coordinated. The isomorphous complexes 3 and 4 exhibit an unprecedented 1-D chain-like polymeric structure through hydroxyl oxygen atoms of bridging Onic2− anions linking up the neighboring central ions, and there exist three types of 6-OHnicH ligands in the structural unit which is rare for lanthanide carboxylate complexes. The photophysical properties of these complexes were studied using ultraviolet absorption spectra, fluorescence excitation and emission spectra. 相似文献
18.
Zhaoyi Chen Jinghua Lv He Zhang Chunmei Wang Chunxiao Wang 《Journal of Coordination Chemistry》2016,69(1):39-47
A copper complex modified Mo-oxide hybrid network stabilized by Keggin polyoxoanion, [{Cu(bpy)2}{Mo12O34(bpy)12}][PMo12O40]2 (bpy = 2,2? is-bipyridine) (1) has been synthesized via self-assembly of simple starting materials. In 1, six [MoO4(bpy)] complexes connect in two different corner-sharing modes to form triangles and linear trimer units, which interconnect alternately to form zigzag chains. {Cu(bpy)2} segments connect the chains into 2-D layers, which are further joined into 3-D supramolecular networks with 1-D channels. The {PMo12PO40} as guest molecules are incorporated into the channels. Compound 1 exhibits bifunctional electrocatalytic behavior for oxidation of ascorbic acid and reduction of H2O2, as well as high-efficient degradation ability for typical dye methylene blue under UV light. 相似文献
19.
具有可逆颜色变化和适当变色寿命的光致变色材料对于无墨水和可擦除打印技术十分重要。我们将1,4,5,8-萘四羧酸二酐与甲硫氨酸结合,设计了一种基于 1,4,5,8-萘二酰胺(NDI)的桥联有机配体(H2ncm),并以 Zn2+和 H2ncm为原料,通过溶剂热反应合成了2种配位聚合物。化合物[Zn(ncm)(H2O)4]·2DMF (1)包含1个Zn2+、1个ncm2-配体、4个配位水分子和2个DMF分子。Zn2+处于八面体的配位环境中,并通过 ncm2-配体连接形成链状结构。化合物[Zn2(ncm)2(H2O)4] (2)包含 2个 Zn2+、2个 ncm2-配体和4个配位水分子。2个Zn2+原子通过2个羧基桥联形成双核结构,并进一步通过ncm2-配体连接形成二维层结构。2显示出从黄色到深棕色的光致变色现象。这种光诱导产生的颜色可以稳定至少3周,但在70 ℃加热时在5 min内即可恢复本来的颜色。我们证明了这种光致变色是源于光照射下NDI·自由基的产生。 相似文献