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1.
钱彬彬  赵萌  常泽  卜显和 《无机化学学报》2017,33(11):2051-2059
在保持原有“层-柱”MOF,[Zn4(bpta)2(dipytz)2(H2O)2]·4DMF·H2O (1)(H4bpta=2,2'',6,6''-联苯四羧酸,dipytz=3,6-二(4-吡啶基)-1,2,4,5-四嗪)主体结构不变的情况下,通过dipytz配体中四嗪环的原位水解反应将极性的二芳酰基联氨基团引入框架,成功构筑出配合物[Zn4(bpta)2(dipytzhydr)2(H2O)2]·solvent (2)(dipytzhydr=1,2-二异烟酰基肼)。对配合物2的系统表征和气体吸附性质研究结果证实了功能化目标的实现:配合物2相比于配合物1展现出更高的二氧化碳吸附热(由28.8 kJ·mol-1升高至30.3 kJ·mol-1)和CO2/CH4吸附选择性。以上结果表明基于配体中四嗪基团的原位水解后修饰能够有效提高相关MOFs材料的CO2吸附性能。  相似文献   

2.
通过溶剂热法合成了2种三维微孔锌金属有机框架材料,其分子式为[Zn3(DBA)(OH)(1,10-phen)2]n(1)和{[Zn2(HDBA)(4,4''-bipy)1.5]·H2O}n(2)(H5DBA=3,5-二(2'',4''-对羧基苯基)苯甲酸;1,10-phen=1,10-菲咯啉;4,4''-bipy=4,4''-联吡啶)。结构分析表明,配合物1为三核锌基金属单元的三维微孔骨架,配合物2为双核锌基的微孔结构。与2相比,配合物1在水中具有较强的发光性能,可作为检测Fe3+、Cr2O72-和丙酮分子的发光传感器,具有较高的选择性和灵敏度。  相似文献   

3.
将具有不同端基的硫脲基团与三苯基磷组分结合,利用所得到的配体合成了2个具有NSP(氮硫磷)鳌合位点的钴-硫脲化合物,并研究了其光解水产氢性能。配合物[Co(L2)(L2'')](BF42.5·H2O·0.5C2H5OH (2)(L2=(2-二苯基膦-苯烯基)-氨基硫脲腙-罗丹明6G,L2''=(2-二苯基膦氧-苯烯基)-氨基硫脲腙-罗丹明6G)通过引入罗丹明荧光团与光敏剂分子协同作用,其产氢TON值可以达到2 800 molH2·molcat-1,其初始TOF值可达到930 molH2·molcat-1·h-1。相同条件下,相比于配合物[Co(L1)(L1'')](BF4)·0.5H2O (1)(L1=(2-二苯基膦-苯烯基)-氨基硫脲腙-硫甲基,L1''=(2-二苯基膦氧-苯烯基)-氨基硫脲腙-硫甲基),提高了体系的催化活性,可能是由于荧光素分子与配合物2之间的分子间π-π堆积作用有利于光敏剂和光催化剂之间的光致电子转移。  相似文献   

4.
将具有不同端基的硫脲基团与三苯基磷组分结合,利用所得到的配体合成了2个具有NSP(氮硫磷)鳌合位点的钴-硫脲化合物,并研究了其光解水产氢性能。配合物[Co(L2)(L2'')](BF42.5·H2O·0.5C2H5OH(2)(L2=(2-二苯基膦-苯烯基)-氨基硫脲腙-罗丹明6G,L2''=(2-二苯基膦氧-苯烯基)-氨基硫脲腙-罗丹明6G)通过引入罗丹明荧光团与光敏剂分子协同作用,其产氢TON值可以达到2800 molH2·mol-1cat,其初始TOF值可达到930 molH2·mol-1cat·h-1。相同条件下,相比于配合物[Co(L1)(L1'')](BF4)·0.5H2O(1)(L1=(2-二苯基膦-苯烯基)-氨基硫脲腙-硫甲基,L1''=(2-二苯基膦氧-苯烯基)-氨基硫脲腙-硫甲基),提高了体系的催化活性,可能是由于荧光素分子与配合物2之间的分子间π-π堆积作用有利于光敏剂和光催化剂之间的光致电子转移。  相似文献   

5.
通过水热反应合成了一种 Cd(Ⅱ)配合物, 分子式为{(H2dbim)0.5[Cd(Hbptc)]·H2O}n (1), 其中 dbim=1-(4-(2, 6-二甲基-2H-苯并[d]咪唑-3(3H)-酰基)甲基)苄基)-2, 7-二氢-2, 5-二甲基-1H-苯并[d]咪唑, H4bptc=3, 3'', 4, 4''-二苯甲酮四羧酸。配合物 1为 2D层状结构, 点符号为{44·66}。配合物 1可用于一些常见环境污染物的荧光识别。研究结果表明, 配合物 1能有效检测对硝基酚、四环素、2, 6-二氯-4-硝基苯胺。计算得到对硝基苯酚、四环素和 2, 6-二氯-4-硝基苯胺对 1的猝灭常数分别为 2×102、5.4×104和 2×104 L·mol-1。  相似文献   

6.
冯超  张灵美  杨雨濛  赵红 《无机化学学报》2023,39(12):2377-2384
采用溶剂热法合成了一种新型的钴(Ⅱ)基配合物,即{[Co(Hppc)2][Co2(4,4''-bipy)(H2O)4](SO42·2H2O}n1),其中H2ppc=5-(3-吡啶基)-1H-吡唑-3-羧酸,4,4''-bipy=4, 4''-联吡啶。配体H2ppc是由吡啶环、吡唑环和羧基共同组成,同时兼具了刚性和柔性。通过单晶X射线衍射对配合物1进行了结构测定。结果显示所合成的配合物1结晶在单斜晶系C2/c空间群,包括2个晶体学独立部分:二维层状[Co(Hppc)2]和一维链状[Co2(4,4''-bipy)(H2O)4]2-,并形成具有{44·62}{4}2拓扑网络结构的共晶化合物。此外,配合物1呈现出良好的电化学发光(ECL)性能以及良好的超级电容器性能。  相似文献   

7.
采用水热方法,用2种联苯四羧酸配体(2,4-H4bpta和3,5-H4bpta)和4,4''-联吡啶(4,4''-bipy)或2,2''-联吡啶(2,2''-bipy)分别与MnCl2·4H2O和CuCl2·H2O反应,合成了一个具有一维双螺旋链结构的配位聚合物[Mn(μ3-2,4-H2bpta)(4,4''-bipy)2]n1)和一个二维层状配位聚合物{[Cu(μ4-3,5-bpta)0.5(2,2''-bipy)(H2O)]·H2O}n2),并对其结构和磁性质进行了研究。结构分析结果表明2个配合物分别属于单斜晶系,P21/cC2/c空间群。配合物1具有一维双螺旋链结构,而且这些一维链通过O-H…N氢键作用进一步形成了二维超分子网络。而配合物2具有二维层状结构。研究表明,配合物1中相邻锰离子间存在铁磁相互作用。  相似文献   

8.
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   

9.
以2,4-二氯苯乙酸、4,4''-联吡啶分别和硫酸镁、氯化钙和硝酸镉反应,采用自然挥发法制备了3个配合物[Mg(DCBA)2(H2O)4]·3(4,4''-bipy)(1)、[Ca(DCBA)(H2O)4]·DCBA·H2O(2)和[Cd(DCBA)2(H2O)2]·2H2O(3)(DCBA=2,4-二氯苯乙酸,4,4''-bipy=4,4''-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3的荧光性质。结果表明,配合物123均为零维结构,其中,配合物1中存在O-H…O、O-H…N、C-H…O、C-H…Cl和O-H…π氢键作用,而配合物2和3中存在O-H…O和C-H…Cl氢键作用,并以此分别形成了3D超分子结构。  相似文献   

10.
采用水热方法,用2种联苯四羧酸配体(2,4-H4 bpta和3,5-H4 bpta)和4,4''-联吡啶(4,4''-bipy)或2,2''-联吡啶(2,2''-bipy)分别与MnCl2·4H2O和CuCl2·H2O反应,合成了一个具有一维双螺旋链结构的配位聚合物[Mn(μ3-2,4-H2bpta)(4,4''-bipy)2]n1)和一个二维层状配位聚合物{[Cu(μ4-3,5-bpta)0.5(2,2''-bipy)(H2O)]·H2O}n2),并对其结构和磁性质进行了研究。结构分析结果表明2个配合物分别属于单斜晶系,P21/cC2/c空间群。配合物1具有一维双螺旋链结构,而且这些一维链通过O-H…N氢键作用进一步形成了二维超分子网络。而配合物2具有二维层状结构。研究表明,配合物1中相邻锰离子间存在铁磁相互作用。  相似文献   

11.
Two new Zn2+‐based metal–organic frameworks (MOFs) based on biphenyl‐2,2′,5,5′‐tetracarboxylic acid, i.e. H4(o,m‐bpta), and N‐donor ligands, namely, poly[[(μ4‐biphenyl‐2,2′,5,5′‐tetracarboxylato)bis{[1,3‐phenylenebis(methylene)]bis(1H‐imidazole)}dizinc(II)] dimethylformamide monosolvate dihydrate], {[Zn2(C16H6O8)(C14H14N4)2]·C3H7NO·2H2O}n or {[Zn2(o,m‐bpta)(1,3‐bimb)2]·C3H7NO·2H2O}n ( 1 ) {1,3‐bimb = [1,3‐phenylenebis(methylene)]bis(1H‐imidazole)}, and poly[[(μ4‐biphenyl‐2,2′,5,5′‐tetracarboxylato)bis{[1,4‐phenylenebis(methylene)]bis(1H‐imidazole)}dizinc(II)] monohydrate], {[Zn2(C16H6O8)(C14H14N4)2]·H2O}n or {[Zn2(o,m‐bpta)(1,4‐bimb)2]·H2O}n ( 2 ) {1,4‐bimb = [1,4‐phenylenebis(methylene)]bis(1H‐imidazole)}, have been synthesized under solvothermal conditions. The complexes were characterized by IR spectroscopy, elemental analysis, single‐crystal X‐ray diffraction and powder X‐ray diffraction analysis. Structurally, the (o,m‐bpta)4? ligands are fully deprotonated and combine with Zn2+ ions in μ4‐coordination modes. Complex 1 is a (3,4)‐connected porous network with honeycomb‐like [Zn2(o,m‐bpta)]n sheets formed by 4‐connected (o,m‐bpta)4? ligands. Complex 2 exhibits a (2,4)‐connected network formed by 4‐connected (o,m‐bpta)4? ligands linking Zn2+ ions in left‐handed helical chains. The cis‐configured 1,3‐bimb and 1,4‐bimb ligands bridge Zn2+ ions to form multi‐membered [Zn2(bimb)2] loops. Optically, the complexes show strong fluorescence and display larger red shifts compared to free H4(o,m‐bpta). Complex 2 shows ferroelectric properties due to crystallizing in the C2v polar point group.  相似文献   

12.
以1,1′-二羟基-5,5′-联四唑(H_2BTO)为配体,镧系金属离子作为金属中心,采用溶剂热法制备了5种金属配合物:[La_2(BTO)_3(H_2O)_8]·2H_2O (1)、[Ce_2(BTO)_3(H_2O)_8]·2H_2O (2)、[Pr_2(BTO)_3(H_2O)_8]·2H_2O (3)、[Sm_2(BTO)_3(H_2O)_8]·2H_2O (4)和[Nd_2(BTO)_3(DMF)_4]·6H_2O (5)。通过单晶X射线衍射和元素分析对5种配合物的结构进行了表征。结果表明,5种配合物均属于单斜晶系,P2_1/n空间群。利用差示扫描量热法研究了配合物1~4的热稳定性,采用Kissinger法和Ozawa法分别计算了其热分解动力学参数。  相似文献   

13.
An effective method was developed for the synthesis of three cluster‐based frameworks with multifarious secondary building units (SBUs) and various structures, which were formulated as [Me2NH2]2[Zn10(BTC)63‐O)(μ4‐O)(H2O)5] · 3DMA · 9H2O ( FJI ‐ 3 ), [Me2NH2]2[Zn93‐OH)2(BTC)6(H2O)3] · 5DMA · 6H2O ( FJI ‐ 4 ) and [Me2NH2][Zn33‐OH)(BTC)2DMF] · H2O ( FJI ‐ 5 ) (H3BTC = 1,3,5‐benzenetricarboxylic acid, DMA = N,N′‐dimethyl acetamide and DMF = N,N′‐dimethyl formamide), respectively. X‐ray structural analysis reveals that FJI ‐ 3 displays 3D highly porous metal‐organic framework with four kinds of microporous cages constructed by two paddle‐wheel Zn2(CO2)4, trimeric Zn3O(CO2)6, and tetrameric Zn4O(CO2)6 SBUs. FJI ‐ 4 exhibits 3D microporous MOFs with a dodecahedral cavities built by paddle‐wheel Zn2(CO2)4 and trimeric Zn3O(CO2)6. FJI ‐ 5 shows 3D microporous MOFs with an 1D channel assembled by the Zn3O(CO2)6 SBUs. In addition, the fluorescence and sorption properties in these cluster‐based frameworks were also investigated. Furthermore, the method employed in this work may provide an useful approach to the design and synthesis of novel cluster‐based frameworks.  相似文献   

14.
Reactions of fresh M(OH)2 (M = Zn2+, Cd2+) precipitate and (RS)-2-methylglutaric acid (H2MGL), 2,2′-bipyridine (bipy), or 1,10-phenanthroline (phen) in aqueous solution at 50°C afforded four new metal–organic complexes [Zn2(bipy)2(H2O)2(MGL)2] (1), [Zn2(phen)2(H2O)(MGL)2] (2), [Cd(bipy)(H2O)(MGL)] · 3H2O (3), and [Cd(phen)(H2O)(MGL)] · 2H2O (4), which were characterized by single crystal X-ray diffraction, IR spectra, TG/DTA analysis as well as fluorescence spectra. In 1, the [Zn(bipy)(H2O)]2+ moieties are linked by R- and S-2-methylglutarate anions to build up the centrosymmetric dinuclear [Zn2(bipy)2(H2O)2(MGL)2] molecules. In 2, the 1-D ribbon-like chains [Zn2(phen)2(H2O)(MGL)2] n can be visualized as from centrosymmetric dinuclear [Zn2(phen)2(H2O)2(MGL)2] units sharing common aqua ligands. Both 3 and 4 exhibit 1-D chains resulting from [Cd(bipy)(H2O)]2+ and [Cd(phen)(H2O)]2+, respectively, bridged alternately by R- and S-2-methylglutarate anions in bis-chelating fashion. The intermolecular and interchain π···π stacking interactions form supramolecular assemblies in 1 and 1-D chains in 24 into 2-D layers. The hydrogen bonded lattice H2O molecules are sandwiched between 2-D layers in 3 and 4. Fluorescence spectra of 14 exhibit LLCT π → π* transitions.  相似文献   

15.
The porous metal–organic framework (MOF) {[Zn2(TCPBDA)(H2O)2]?30 DMF?6 H2O}n ( SNU‐30 ; DMF=N,N‐dimethylformamide) has been prepared by the solvothermal reaction of N,N,N′,N′‐tetrakis(4‐carboxyphenyl)biphenyl‐4,4′‐diamine (H4TCPBDA) and Zn(NO3)2?6 H2O in DMF/tBuOH. The post‐synthetic modification of SNU‐30 by the insertion of 3,6‐di(4‐pyridyl)‐1,2,4,5‐tetrazine (bpta) affords single‐crystalline {[Zn2(TCPBDA)(bpta)]?23 DMF?4 H2O}n ( SNU‐31 SC ), in which channels are divided by the bpta linkers. Interestingly, unlike its pristine form, the bridging bpta ligand in the MOF is bent due to steric constraints. SNU‐31 can be also prepared through a one‐pot solvothermal synthesis from ZnII, TCPBDA4?, and bpta. The bpta linker can be liberated from this MOF by immersion in N,N‐diethylformamide (DEF) to afford the single‐crystalline SNU‐30 SC , which is structurally similar to SNU‐30 . This phenomenon of reversible insertion and removal of the bridging ligand while preserving the single crystallinity is unprecedented in MOFs. Desolvated solid SNU‐30′ adsorbs N2, O2, H2, CO2, and CH4 gases, whereas desolvated SNU‐31′ exhibits selective adsorption of CO2 over N2, O2, H2, and CH4, thus demonstrating that the gas adsorption properties of MOF can be modified by post‐synthetic insertion/removal of a bridging ligand.  相似文献   

16.
Magnetic susceptibility investigations have been carried out on a family of the tetra-transition-metal sandwiched Weakley-type germanotungstates Na11H[Co4(H2O)2(α-GeW9O34)2]·31H2O (1), (C6N2H18)4[Co(H2O)6]H2[Co4(H2O)2(α-GeW9O34)2]·5.5H2O (2) and Na(H2O)2(C6N2H18)4.75H1.5[Ni4(H2O)2(α-GeW9O34)2]·1.5H2O (3) with the intention of studying the magnetic exchange properties of the rhomb-like four transition-metal ions in the central belt. The Co–Co and Ni–Ni ferromagnetic exchange interactions are dominant in the rhomb-like M4O16 units in 13. Furthermore, magnetic susceptibility measurements also reveal that the magnetic coupling constant J is a sensitive parameter that is closely realted to the M–O–M angles and M···M separations in the rhomb-like magnetic core. Variable-temperature ac susceptibilities exhibit that magnetic properties of 2 and 3 are related to the spin glassy behaviors.  相似文献   

17.
通过水热/溶剂热合成的方法制备了3个Zn(Ⅱ)/Co(Ⅱ)配合物{[Zn(H2L)(H2O)3]·H2O·0.5H4L}n(1)、{[Co(L)0.5(4,4'-bpy)]·0.5H2O}n(2)和{[Co(L)0.5(pbmb)(H2O)]·H2O}n(3)(H4L=5,5'-(hexane-1,6-diyl)-bis(oxy)diisophthalic acid,4,4'-bpy=4,4'-bipyridine,pbmb=1,1'-(1,3-propane)bis-(2-methylbenzimidazole))。结构分析表明配合物1为一维链结构。2为拓扑符号为(64·7·8)(6·72)的三重穿插网络结构。3是拓扑符号为(4·62)(42·62·82)的(3,4)-连接的二维网络结构。配合物1呈现出较好的荧光性质。  相似文献   

18.
合成了3种金属配合物{[Cd(pztc)(H2O)2]·(H2bpy)·3(H2O)}n1),{[Zn3(pztc)2(Hbpy)2(bpy)(H2O)4]·7H2O}n2),[Cu6(pztc)4(Hbpy)4(bpy)2(H2O)8]·17H2O(3)(bpy=4,4’-联吡啶,H4pztc=吡嗪-2,3,5,6-四甲酸),并对其进行了红外光谱分析、元素分析、热重分析、荧光光谱分析和X-射线单晶衍射分析。其中13中存在丰富的氢键,2为3D网状结构,存在金鱼状(H2O)10水簇。3为由化学键连接成的1D链状结构,由氢键连接成3D超分子结构。当激发光波长为320nm时,12的最大荧光发射峰分别在496nm和494nm。  相似文献   

19.
采用溶剂热的方法,将配位模式丰富的多羧酸有机配体5-(2-硝基-4-羧基苯氧基)-间苯二甲酸(H3ncpoi)与Cd~(2+)离子以及不同的辅助配体原位组装而成4个新的配位聚合物晶体:[Cd(Hncpoi)(2,2′-bpy)(H2O)]n(1),{[Cd2(Hncpoi)2(bpyp)(H2O)4]·3H2O}n(2),{[Cd2(Hncpoi)2(azpy)(H2O)2]·2H2O}n(3),{[Cd2(Hncpoi)2(dpe)(H2O)2]·2H2O}n(4),其中H3ncpoi为5-(2-硝基-4-羧基苯氧基)-间苯二甲酸,2,2′-bpy为2,2′-联吡啶,bpyp为1,4-二-吡啶基-4-亚甲基-哌嗪,azpy为4,4′-偶氮吡啶,dpe为1,2-二-(4-吡啶基)乙烯。对4个配合物进行了X射线单晶衍射、粉末衍射,元素分析、热重、荧光光谱等表征。X射线单晶结构分析表明,配合物1,2具有一维链状结构,而配合物3,4则具有二维(4,4)格子层状结构,一维链和二维层之间通过分子间作用力连接成三维超分子结构。进一步研究表明,辅助配体的构型、配位方式等对晶体结构具有决定性作用。与此同时,对几个配合物的荧光光谱进行分析,发现不同的辅助配体对配合物的荧光性能有着显著的影响。  相似文献   

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