基于联苯四羧酸的Zn(Ⅱ)配合物的合成、结构和性质

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.     

2,2'-联吡啶-3,3',6,6'-四羧酸过渡金属配合物的合成、结构及性质

以2,2'-联吡啶-3,3',6,6'-四羧酸(H₄bptc)为配体,通过水热合成的方法与过渡金属盐合成了3个配合物,其分子式分别为[Co₂(H₂bptc)₂(H₂O)₄]·bpe·9H₂O(1),[Ni₂(H₂bptc)₂(H₂O)₄]·bpe·9H₂O(2),[Ni₂(H₂bptc)₂(H₂O)₄]·0.5bpp·7H₂O(3)(bpe=1,2-二(4-吡啶基)乙烯,bpp=1,2-二(4-吡啶基)乙烷)。用红外光谱,X-射线单晶衍射对化合物的晶体结构进行了表征,并对这3个配合物的热稳定性进行了测试。化合物1~3为单核结构的配合物,它们均通过分子间氢键形成三维超分子结构。     

2,2''-联吡啶-3,3'',6,6''-四羧酸过渡金属配合物的合成、结构及性质

以2,2'-联吡啶-3,3',6,6'-四羧酸(H₄bptc)为配体,通过水热合成的方法与过渡金属盐合成了3个配合物,其分子式分别为[Co₂(H₂bptc)₂(H₂O)₄]·bpe·9H₂O(1),[Ni₂(H₂bptc)₂(H₂O)₄]·bpe·9H₂O(2),[Ni₂(H₂bptc)₂(H₂O)₄]·0.5bpp·7H₂O(3)(bpe=1,2-二(4-吡啶基)乙烯,bpp=1,2-二(4-吡啶基)乙烷)。用红外光谱,X-射线单晶衍射对化合物的晶体结构进行了表征,并对这3个配合物的热稳定性进行了测试。化合物1~3为单核结构的配合物,它们均通过分子间氢键形成三维超分子结构。     

由联苯-2,4,4',6-四甲酸构筑的三维镉配位聚合物的合成、结构及与DNA作用

在水热条件下,以联苯-2,4,4',6-四甲酸(C16H10O12,H4bptc)为主配体、1,3-二(4-吡啶基)-丙烷(bpp)为辅助配体,与氯化镉(CdCl₂·2.5H₂O)反应合成了2个三维镉配位聚合物{[Cd₂(bptc)(H₂O)₃]·H₂O}_n (1),{[Cd₂(bptc)(bpp)·H₂O]·2.25H₂O}_n (2)。用元素分析、红外光谱对配合物的组成及结构进行了表征,并通过X射线单晶衍射的方法测定了配合物的晶体结构。配合物1具有双核结构,2个中心离子Cd(Ⅱ)同为六配位,均形成略有畸变的八面体结构;而配合物2尽管也具有双核结构,但不同于1的是其中一个中心离子构成略显畸变的八面体几何结构,另一个却构成五角双锥结构。用溴化乙锭荧光光谱法测定了配体和配合物与DNA作用情况,结果表明配合物与DNA的作用强于配体。     

基于3-氧醚乙酸-邻苯二酸和N-辅助配体的锌和镉配合物的合成、晶体结构及荧光性质

水热法合成得到2个配合物, {[Zn₇(L)₄(bpe)₂(μ₃-OH)₂(H₂O)₈]·4H₂O}_n(1), 和{[Cd₃(L)₂(bpy)_2.5(H₂O)]·5.5H₂O}_n(2)(H₃L=3-(carboxymethoxy)benzene-1,2-dioic acid, bpe=1,2-bis(4-pyridyl)-ethene, bpy=4,4'-bipyridine), 并采用元素分析、红外光谱、热重和X-射线单晶衍射对其结构进行表征。配合物1中, 配体L^3-和bpe连接[Zn₅( μ₃-OH)₂]中心形成一维链, 这样的链通过氢键连接成三维的超分子结构。配合物2呈现(3,3,6)连接的网状结构。此外, 对配合物1和2的荧光性质进行了研究。     

基于三联吡啶-4-羧酸的系列配合物的结构多样性和发光性质

在溶剂热条件下制备了系列新配合物：[Cr₂(tpc)₂(HCOO)₂(OH)₂] ·4H₂O (1)、[Ba(tpc)₂(H₂O)₂]_n (2)、[Zn₂(tpc)₂(NO₃)₂]_n (3)、[Pb(Htpc)(NO₃)₂]·2H₂O (₄)和[Rh(Htpc)Cl₃]·CH₃OH·H₂O (5)(Htpc=2,2''∶6,2″-三联吡啶-4-羧酸)。X射线单晶衍射分析表明,有机配体呈4种不同的配位方式;配合物1~5通过C—H…O/N氢键和π…π相互作用形成了新颖的超分子网络。研究了这些配合物的发光性能。在365 nm紫外辐射下,晶体2~5分别呈现绿色、蓝色、蓝紫色和金色。     

以吡嗪四甲酸为配体的配合物的合成及表征

合成了两种金属配合物{[Cu₂(pztc)(4,4'-bpy)(H₂O)₄]·6H₂O}_n (1),{(H₂bpe)[Cd(pztc)(H₂O)₂]·2.5H₂O}_n (2)(H₄pztc=吡嗪-2,3,5,6-四甲酸,bpy=4,4'-联吡啶,bpe=1,2-二(4-吡啶基)乙烯),测定了其晶体结构,并对其进行了红外光谱、荧光光谱和热重分析等表征。两种配合物均为二维层状结构,但其中吡嗪四酸的配位方式不同。配合物2具有蓝色的荧光,最大荧光发射峰在475 nm。测试了配合物1的电子顺磁共振谱,结果显示Cu²⁺的特征谱带。     

基于半刚性三角形羧酸配体构筑的配位聚合物的合成,结构及其荧光性质

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L^3-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。     

4,4''-联吡啶桥联的三个铜有机膦酸配合物的合成、结构及磁性

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。     

一系列由柔性N,N'-双(3-吡啶甲基)胺构筑的螺旋配合物的合成、结构和性质

合成和表征了5个螺旋配位聚合物{[Cu(Hbpma)(H₂O)₄]₂(SO₄)₃·3.5H₂O}_n (1)、{[Ni(Hbpma)(H₂O)₄]₄(SO₄)₆·10.75H₂O}_n (2)、{[Mn(Hbpma)(H₂O)₄](SO₄)_1.5·3H₂O}_n (3)、{[Zn(Hbpma)(H₂O)₄]₄(SO₄)₆·4H₂O·4CH₃OH}n (4)和{[Cu(Hbpma)2(H₂O)₂](SO₄)₂·9H₂O}_n (5), 其中bpma代表N,N'-双(3-吡啶甲基)胺。晶体结构分析表明配合物1~4为一维链状结构, 配合物5为二维层状结构, 其中金属离子由质子化的bpma配体桥连。值得注意的是, 采取反-反式构象的柔性bpma配体使得配合物1和2为假螺旋链结构, 配合物3和4为螺旋链结构, 配合物5为螺旋层结构。同时研究了配合物的磁性和热稳定性。     

三维锌配位聚合物的合成、晶体结构及与DNA的作用

在水热条件下,由联苯-2,4,4′,6-四甲酸(H4bptc),4,4′-联吡啶(bipy),合成了3种锌配位聚合物[Zn(bptc)0.5]n(1),[Zn2(bptc)(H2O)3]n·n H2O(2),[Zn2(bptc)(H2O)(bipy)1.5]n·n H2O(3),用元素分析、红外光谱等方法对配合物的组成进行了表征,并通过单晶X-射线衍射方法测定了配合物的晶体结构。结果表明:配合物1具有双核结构,八元环金属簇Zn2(COO)22+自组装成具有(6,6)-连接拓扑结构;配合物2具有(4,5,6)-连接拓扑结构;配合物3在辅助配体的构筑下形成三维网络结构。用溴化乙锭荧光探针法测试了配合物对EB-DNA复合体系的荧光猝灭效应,实验结果显示配合物均能使EB-DNA复合体系的荧光发生不同程度的猝灭,由此推测配合物均与DNA发生了不同程度的插入作用,引入具有刚性平面辅助配体之后的配合物3,其作用力又强于不加辅助配体的配合物1和2。     

Syntheses,crystal structures,and optical properties of a series of transition metal coordination polymers with chelidamic acid and 4,4′-bipyridine

A series of transition metal (Zn, Cu, Mn) complexes with chelidamic acid (2,6-dicarboxy-4-hydroxypyridine, H₃CAM) and 4,4′-bipyridine (bipy), [Zn₂(bipy)Cl₂] _n (1), {[Zn₂(HCAM)(H₂CAM)₂]?·?(bipy)?·?3.5H₂O} _n (2), [Mn₃(HCAM)₃(H₂O)₇]?·?(bipy)?·?3H₂O (3), [Mn₂(HCAM)₂(bipy)?·?(H₂O)₂]?·?4H₂O (4), [Cu₂(HCAM)₂(bipy)?·?(H₂O)₂]?·?4H₂O (5), and Cu₂(HCAM)₂(bipy)?·?(H₂O)₂ (6), have been synthesized by hydrothermal or solution methods and characterized by single-crystal X-ray diffraction. The structural analyses reveal that 1 exhibits a zigzag chain of Zn(II), Cl^?, and 4,4′-bipyridine. In 2, a 1-D polymeric [Zn₂(HCAM)(H₂CAM)₂] _n chain and a discrete 4,4′-bipyridine assemble into a 2-D supramolecular network via H-bonds. Complex 3 consists of asymmetric units of Mn₃(HCAM)₃(H₂O)₇ that are linked by hydrogen bonds to form a 2-D H-bonded network. Complexes 4–6 are isomorphous and possess discrete structures. The photoluminescent properties of 1–6 at room temperature were studied.     

Hydrothermal synthesis,structure, and photoluminescence of four complexes based on 1H-imidazole-4,5-dicarboxylate or 1H-imidazole-2-carboxylate ligands

Four complexes, [Ag₄(bipy)₂(Himdc)₂(H₂O)₂] _n (1), [Ag(H₂imdc)] _n (2), [K(H₃imdc)(H₂imdc)(H₂O)₂] _n (3), and [Cu(Himc)₂] (4) (H₃imdc?=?1H-imidazole-4,5-dicarboxylic acid, H₂imc?=?1H-imidazole-2-carboxylic acid, and bipy?=?4,4′-bipyridine), were hydrothermally synthesized and characterized by single-crystal X-ray diffraction analysis and elemental analysis. The obtained complexes exhibit different coordination structures; 1 contains a 2-D supramolecular layer based on two chains arraying uniformly in an ABAB manner. Compound 2 displays sawtooth-shaped 1-D chains extending to 2-D layers via hydrogen bond interactions. Compound 3 possesses a 3-D framework structure based on a 1-D chain via hydrogen bonding interactions. Compound 4 has a 3-D framework structure bearing a pcu-type topology. In addition, the photoluminescence for 1 has been investigated.     

Synthesis,crystal structures,and fluorescence properties of (RS)-2-methylglutarato Zn(II), Cd(II) complexes

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 2–4 into 2-D layers. The hydrogen bonded lattice H₂O molecules are sandwiched between 2-D layers in 3 and 4. Fluorescence spectra of 1–4 exhibit LLCT π → π* transitions.     

4个Cd(Ⅱ)配位聚合物:辅助配体对晶体结构以及荧光性能的影响

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Cd²⁺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。     

四个Cd(Ⅱ)配位聚合物:辅助配体对晶体结构以及荧光性能的影响

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。     

Synthesis, structures and luminescent properties of Co(II) and Ni(II) metal-organic frameworks with semirigid diphthalic ligands

A series of transition metal coordination polymers [Co(H₃L)₂(4,4′- bpy)(H₂O)₂]_n?n(4,4′-bpy) (1), [Ni(H₂L)(4,4′-bpy)(H₂O)₂]_n (2), [Co₂(L)(phen)₂(H₂O)₄]_n?(H₂O)_2n (3), and [Ni₂(L)(phen)₂(H₂O)₄]_n?(H₂O)_2n (4) have been assembled from a semirigid multicarboxylate ligand 3,3′-(1,4-phenylenebis(oxy))diphthalic acid (H₄L) with the help of 4,4′-bipyridine (4,4′-bpy) ligand or 1,10-phenanthroline (phen) ligand. X-ray single crystal diffraction analysis reveals that complex 1 crystallizes in the space group of P − 1 and displays a one-dimensional (1D) chain structure constructed from 4,4′-bpy ligand and H₃L ligand, which was further interlinked to form a three-dimensional network via hydrogen bonds. In complex 2, Ni(II) atoms are coordinated by L ligand in monodentate fashion to form alternate left- and right-helices, which are further bridged together by the coordination interactions between Ni(II) atoms and 4,4′-bpy, leading to a 2-fold (4, 4)-connected interpenetrating network. Isostructural complexes 3 and 4 belong to the space group P − 1 and display a 1D chain structure constructed from phen and L ligands, which was further interlinked to form a 2D plane via π–π interactions. In addition, their thermal and luminescent properties were also investigated.     

Positional isomeric and N-donor auxiliary chelating ligand effect on engineering crystalline architectures of four lead(II) complexes with diverse fluorescent properties

This work presents an investigation on the positions of the substituent and N-donor auxiliary chelating ligand (bipy/phen) effect on engineering of crystalline architectures of four Pb(II) complexes with a pair of methyl-substituted 3-sulfobenzoic isomers: [Pb(4-msba)(phen)(H₂O)] (1), [Pb(4-msba)(bipy)(H₂O)]·H₂O (2), [Pb(5-msba)(phen)₂]·9H₂O (3), and [Pb₂(5-msba)₂(bipy)₂(H₂O)₂] (4) (4/5-msba?=?4/5-methyl-3-sulfobenzoate, phen?=?1,10-phenanthroline and bipy?=?2,2′-bipyridine). The lead(II) ions exhibit hemidirected geometry in 1–4. The positions of the methyl as well as the auxiliary chelating ligands influence coordination modes of the sulfonates and thus determine the architectures. As the position of methyl in aromatic ring changes from 4 to 5, the structures change from 2-D sheet-like compounds for 1 and 2 to 0-D dimeric species for 3 and 4. A water cluster (H₂O)₁₈ exists in 3, which further assembles into a water tape with a new pattern T4(3)4(3)10(3)A4. Complex 3 loses crystallinity rapidly in the open air and turns into [Pb(5-msba)(phen)₂]·2H₂O (3A). Thermal stabilities and solid state fluorescent properties of 1, 2, 3A, and 4 have been studied.     

基于双(4-(1H-咪唑-1-基)苯基)甲酮的三个锌配位聚合物的结构多样性和发光性质

通过溶剂热法合成了3个锌的配位聚合物{[Zn₂(bipmo)₂(ipa)₂]·3H₂O}_n(1)、{[Zn (bipmo)(5-OH-ipa)]·DMA·H₂O}_n(2)和{[Zn (bipmo)(5-Me-ipa)]·H₂O}_n(3),其中bipmo=双(4-(1H-咪唑-1-基)苯基)甲酮,H₂ipa=间苯二甲酸,5-OH-ipaH₂=5-羟基间苯二甲酸,5-Me-ipaH₂=5-甲基间苯二甲酸。用元素分析、红外光谱和单晶X射线衍射等技术对结构进行了表征。单晶X射线衍射分析表明,配合物1具有二重互穿的{4⁴·6²}二维网络结构,配合物2则是{6⁵·8}拓扑的二维结构,配合物3却表现为二维的{6³}拓扑网络。间苯二甲酸上5-位取代基的不同对最终的结构形成有重要的影响。此外,对化合物1~3的发光性质也进行了详细研究。     

吡嗪-2, 3, 5, 6-四甲酸及4, 4-联吡啶与ds-金属配合物合成、结构及发光性质

合成了3种金属配合物{[Cd（pztc）（H₂O）₂]·（H₂bpy）·3（H₂O）}_n（1）,{[Zn₃（pztc）₂（Hbpy）₂（bpy）（H₂O）₄]·7H₂O}_n（2）,[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1和3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,1和2的最大荧光发射峰分别在496nm和494nm。