基于4-(2，4-二羧基苯氧基)邻苯二甲酸配体的锌配位聚合物的合成、结构及其荧光传感性能

基于H₄dpa和bpy (H₄dpa=4-(2,4-二羧基苯氧基)邻苯二甲酸,bpy=4,4''-联吡啶)为配体,在水热条件下设计、合成了金属锌配位聚合物(Zn-CP)[Zn(H₂dpa)(bpy)_1.5]_n (1),并用元素分析、红外光谱、X射线单晶衍射等对其进行了结构表征。在1中相邻Zn²⁺与H₂dpa^2-离子和bpy配位形成一维双链结构,相邻的一维双链通过氢键作用扩展形成三维超分子网结构。荧光研究表明：1是一种灵敏度高、选择性好、多响应的荧光传感器,可用于农药和硝基爆炸物的检测。有趣的是,2,4,6-三硝基苯(TNP)和嘧霉胺(Pth)对1的荧光发射显示出明显的猝灭效果,而抑霉唑(Ima)对1有荧光增强效果。此外,通过紫外可见吸收光谱、荧光寿命以及X射线光电子能谱探究了1的荧光传感机理。     

一种高灵敏、多响应的Zn-MOF荧光传感器对Fe3+、2，4，6-三硝基苯酚和奥硝唑的检测

在水热条件下基于H₄bta(1,2,3,5-苯四酸)和bpy(4,4''-联吡啶)配体设计、合成了一个锌的金属有机骨架(Zn-MOF){[Zn₂(bta)(bpy)(H₂O)₂]·H₂O}_n(1),并用元素分析、红外光谱、X射线单晶衍射等对其进行了结构表征。MOF 1为三维网状结构。完全去质子化的(bta)^4-配体采用了μ₆-η¹-η²-η²-η¹螯合桥联配位方式。有意思的是,MOF 1是一种高灵敏度、选择性好、多响应的荧光传感器,可用于Fe³⁺、2,4,6-三硝基苯酚和奥硝唑的快速检测。此外还研究了1的热稳定性。     

基于3，3′，4，4′-四羧基偶氮苯构筑的三个金属配合物的合成、晶体结构及性质

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]_n（2）和{[Ag（dpe）]·0.5（H₂ddb）·H₂O}_n（3）（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ddb^4-配体以μ₄：η¹,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H₂ddb^2-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。     

一种水中稳定的锌(Ⅱ)金属有机骨架用于检测四环素

采用溶剂热法合成1个锌(Ⅱ)金属有机骨架(Zn-MOF):[Zn (H₂L)(4,4''-bpy)]_n (1),其中H₄L=1,1''-乙烷基联苯-3,3'',5,5''-四羧酸,4,4''-bpy=4,4''-联吡啶。通过单晶X射线衍射、元素分析和热重分析等方法对其结构进行表征。单晶结构分析表明,1属于单斜晶系C2/c空间群,H₂L^2-配体采取单齿配位模式连接Zn(Ⅱ)形成一维链,4,4''-bpy连接一维链构筑成二维波浪状网。该化合物在水中表现出良好的稳定性,并且可作为高灵敏度、高选择性荧光探针检测四环素(TET),其检出限为0.17 μmol·L^-1。1可成功用于延河水中TET的测定。此外,还研究了1对TET的荧光猝灭机理。     

基于5-(3'',4''-二(四唑-5''-基)苯氧基)间苯二甲酸构筑的镧系金属配合物的合成、晶体结构及性质

在水热条件下利用H₂btpa配体合成了2个镧系金属配合物{[Ln(btpa)(H₂O)(OH)]·bpy}_n(Ln=Tb(1),Pr(2),H₂btpa=5-(3',4'-二(四唑-5'-基)苯氧基)间苯二甲酸,bpy=4,4'-联吡啶),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和2中,双核镧系金属单元通过btpa2-配体以μ₄:η¹,η²,η¹,η²的配位模式连接,形成二维网状结构,客体分子4,4'-联吡啶通过分子间的氢键作用存在于结构中。相邻的二维网通过氢键的识别作用以锁链形式拓展为三维超分子结构。室温下配合物1呈现出Tb^Ⅲ的特征荧光发射峰。     

金属离子导向的2,2'-联苯甲酸和1,4-二(1-苯并咪唑基甲基)苯构筑的配合物的合成、结构和性质

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]_n（1）,{[Cd（bbix）_0.5（dpa）]·0.5H₂O}_n（2）。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,dpa^2-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1和2的热稳定性以及室温下2的荧光性能。     

一种水中稳定的锌(Ⅱ)金属有机骨架用于检测四环素

采用溶剂热法合成1个锌(Ⅱ)金属有机骨架（Zn-MOF）：[Zn (H₂L)(4,4''-bpy)]_n (1),其中H₄L=1,1''-乙烷基联苯-3,3'',5,5''-四羧酸,4,4''-bpy=4,4''-联吡啶。通过单晶X射线衍射、元素分析和热重分析等方法对其结构进行表征。单晶结构分析表明,1属于单斜晶系C2/c空间群,H₂L^2-配体采取单齿配位模式连接Zn (Ⅱ)形成一维链,4,4''-bpy连接一维链构筑成二维波浪状网。该化合物在水中表现出良好的稳定性,并且可作为高灵敏度、高选择性荧光探针检测四环素(TET),其检出限为0.17 μmol·L^-1。1可成功用于延河水中TET的测定。此外,还研究了1对TET的荧光猝灭机理。     

一种水中稳定的锌(Ⅱ)金属有机骨架用于检测四环素

采用溶剂热法合成1个锌(Ⅱ)金属有机骨架（Zn-MOF）：[Zn (H₂L)(4,4''-bpy)]_n (1),其中H₄L=1,1''-乙烷基联苯-3,3'',5,5''-四羧酸,4,4''-bpy=4,4''-联吡啶。通过单晶X射线衍射、元素分析和热重分析等方法对其结构进行表征。单晶结构分析表明,1属于单斜晶系C2/c空间群,H₂L^2-配体采取单齿配位模式连接Zn (Ⅱ)形成一维链,4,4''-bpy连接一维链构筑成二维波浪状网。该化合物在水中表现出良好的稳定性,并且可作为高灵敏度、高选择性荧光探针检测四环素(TET),其检出限为0.17 μmol·L^-1。1可成功用于延河水中TET的测定。此外,还研究了1对TET的荧光猝灭机理。     

基于5-(4-(2,6-二(2-吡嗪基)-4-吡啶基)苯氧基)间苯二甲酸的Mn(Ⅱ)和Ca(Ⅱ)配位聚合物的合成与晶体结构

采用对苯二甲酸为模板剂, 溶剂热法合成了2个以5-(4-(2, 6-二(2-吡嗪基)-4-吡啶基)苯氧基)间苯二甲酸(H₂L)为配体的金属-有机配位聚合物:{[MnL] ·0.5H₂O}_n (1), {[CaL(H₂O)₂]·H₂O}_n (2)。通过X-射线单晶衍射, 元素分析和红外光谱进行了结构表征。结构分析表明, 1具有(3, 3)-连接的不同手性型二维层面结构, 这些交替出现的单手性左旋型和右旋型二维平面通过配体的吡啶环与吡嗪环间π…π堆积作用构成了三维超分子结构;2是通过L^2-配体羧基桥连接相邻的Ca(Ⅱ)金属中心, 形成一条平行于b轴方向的一维链结构。研究了配位聚合物的热稳定性和2的荧光性质。     

基于镉(Ⅱ)配位聚合物对呋喃妥因的荧光传感性能

采用溶剂热法成功合成了1个新的二维配位聚合物(CP)[Cd₂(L)(dbpy)₂(HCOO)(H₂O)]·3H₂O (1),其中H₃L=5-((4-羧基苄基)氨基)间苯二甲酸,dbpy=5,5''-二甲基-2,2''-联吡啶。CP 1经单晶X射线衍射、粉末X射线衍射、元素分析、红外光谱、热重和固体荧光光谱表征。CP 1的结构可简化为点符号为(6³)的3连接二维hcb层。更重要的是,CP 1可以通过荧光猝灭效应选择性和灵敏地识别水相中的抗生素呋喃妥因,并且具有较低检测限(LOD=0.19 μmol·L^-1)。此外,初步探索发现荧光猝灭机制可能是由荧光共振能量转移引起。     

Synthesis,crystal structure,and properties of cobalt,zinc, and manganese coordination polymers based on fluconazole

Three complexes based on fluconazole, namely, {[Co₂(HFlu)(dpa)₂(H₂O)₂]·H₂O}_n (1), {[Zn(HFlu)(IPA)]·H₂O}_n (2), and {[Mn(HFlu)₂(IPA)(H₂O)]·H₂O}_n (3) (HFlu?=?fluconazole, 2-(2,4-difluoro-phenyl)-1,3-bis(1,2,4-triazol-1-yl)-propan-2-ol; H₂dpa?=?diphenic acid; H₂IPA?=?isophthalic acid) have been synthesized. Single-crystal X-ray analysis revealed that 1 is a 2-D-network framework containing a trinuclear Co(II) unit, 2 is a 3-D framework, and 3 is 1-D double chain structure with a Mn₂ metallocyclic core. The complexes have also been characterized by elemental analyses, IR, UV/vis and fluorescence spectroscopy, and thermal gravimetry. The phase purity of these polymers has been confirmed via powder X-ray diffraction.     

1,2,4-苯三甲酸与2,2-联吡啶构筑的银(Ⅰ)和镉(Ⅱ)配合物的合成、晶体结构、热稳定性及荧光性质

通过pH调控的水热法合成了2种配合物[Ag(H2btc)(bpy)](1)和[Cd(Hbtc)(bpy)(H2O)2]n(2)(H3btc=1,2,4-苯三甲酸,bpy=2,2′-联吡啶),并通过X射线单晶衍射、红外光谱、热重分析、荧光光谱进行了表征与性质研究。结果表明,配合物1为零维的单核小分子结构,配合物2为一维的链状结构。荧光研究表明,这2种配合物均具有荧光性质。     

Coordination polymers constructed from an asymmetric dicarboxylate and N-donors: preparation,characterization, and properties

Two new coordination polymers with an asymmetric dicarboxylate and 4,4′-bipyridine ligand, {[Co(bpy)(H₂O)₄]·(cpa)·0.5H₂O}_n (1) and {[Ag(cpa)(bpy)][Ag(bpy)]·4H₂O}_n (2) (H₂cpa = 4-(2-carboxyethyl)benzoic acid, bpy = 4,4′-bipyridine), have been hydrothermally synthesized and characterized by elemental analysis, FT-IR spectroscopy, and single-crystal X-ray diffraction. Compound 1 displays a linear chain with guest molecule (cpa)^2? ions existing in the structure. Compound 2 contains two independent units, [Ag(cpa)(bpy)]^– (A) and [Ag(bpy)]⁺ (B), which form a 1-D + 1-D structure. A shows a 1-D chain structure bearing hooks formed by the carboxylates and organized into a tubular structure by hydrogen-bonding interactions. B has linear chains formed from Ag⁺ and bpy. The A and B chains co-crystallize with waters of crystallization to provide two linear [Ag(bpy)]⁺ chains embedded in the tubular structure formed by A via π…π stacking contacts. In 1 and 2, hydrogen-bonding and π…π stacking interactions connect the discrete 1-D chains into 3-D supramolecular structures. The fluorescent properties, TG analysis, and X-ray powder diffraction patterns for 1 and 2 were also measured.     

Synthesis, crystal structures and fluorescence properties of four mixed-ligands Zn(Ⅱ) and Cd(Ⅱ) coordination compounds

Four new coordination compounds, [Zn(dba)(bpy)]n (1), {[Zn(dba)(phen)]·2H2O}n (2), [Cd(dba)(bpy)(H2O)2] (3) and [Cd2(dba)2(phen)2]n (4) (H2dba = 2,5-dihydroxy-p-benzenediacetic acid, bpy = 2,2′-bipyridine, phen = 1,10-phenanthroline) have been prepared via solvothermal method and characterized by sin-gle-crystal X-ray diffraction, infrared spectroscopy, elemental analysis and powder X-ray diffraction. 1 and 2 possess 1D infinite chain structures. Complex 3 exhibits a mononuclear structure. Complex 4 owns bi...     

Syntheses and crystal structures of four new fpa-metal complexes through in situ ligand reaction

Four new fpa-metal complexes, [Co(fpa)₂(H₂O)₂] (1), [Cu(fpa)₂(H₂O)] (2), [Zn₂(fpa)₄(bpp)₂] _n (3), and {[Zn(bpy)(H₂O)₄]?·?2(fpa)} _n (4), have been synthesized and fully characterized by elemental analyses, IR spectroscopy, single-crystal X-ray diffraction, and thermogravimetric analysis (TGA), (Hfpa?=?2,2-difluoro-2-(pyridine-2-yl)acetate, bpp?=?1,3-bis(4-pyridyl)propane, bpy?=?4,4′-bipyridine). X-ray diffraction analyses reveal that 1 and 2 with 0-D structures are both extended into 3-D supramolecular networks through hydrogen bonds and π···π interactions. Complex 3 with chiral centers possesses a 1-D structure constructed by two kinds of bpp molecules and four kinds of fpa^? molecules with different conformations, with bbp and fpa^? bridging and capped ligands, respectively. In 4, bpy links [Zn(H₂O)₄]²⁺ into a 1-D polymeric cationic chain and uncoordinated fpa^? compensates the framework charge. The results of TGA reveal that fpa^? decomposes through two processes. Both 3 and 4 show strong fluorescence in the solid state at room temperature.     

Influence of axial ligands and anions on the Ni–Ni distances in trinickel string complexes: synthesis,structure, and properties of [Ni3(dpa)4(CH3CN)2] · (ClO4)2 · (CH3CN) · H2O

A cation–anion metal string complex with neutral axial ligands, [Ni₃(dpa)₄(CH₃CN)₂] · (ClO₄)₂ · (CH₃CN) · H₂O (1) where dpa^? is 2,2′-dipyridylamine anion, was synthesized and characterized by elemental analysis, IR, fluorescence, UV, and CV spectroscopic methods, and single crystal X-ray analysis. The Ni–Ni distances in 1 are longer than those in [Ni₃(dpa)₄(CH₃CN)₂] · (PF₆)₂ · 3.14CH₃CN (2) and [Ni₃(dpa)₄F₂] · [Ni₃(dpa)₄(H₂O)₂] · (BF₄)₂ · 2CH₃OH, indicating that the counter anions affect the Ni–Ni distances of trinickel string complexes. Compared with Ni₃(dpa)₄Cl₂ and Ni₃(dpa)₄(ClO₄)₂, 1 also has different fluorescence, UV, and CV properties. Therefore, this study clearly indicates that ligands and counter anions largely influence the structures and properties of trinickel string complexes.     

三角柔性多羧酸金属有机骨架化合物的合成、结构及荧光性质

以柔性1,3,5-三（4-羧酸苯氧基）苯（H₃TCPB）为配体,以4,4''-联吡啶（4,4''-BPY）为辅助配体,在溶剂热条件下合成了2个新颖的分别具有三核锌簇和三核钴簇的金属有机骨架化合物：{[Zn₃（TCPB）₂（4,4''-BPY）]·DMF·3H₂O}_n（1）和{[Co_1.5（TCPB）（DMF）（H₂O）]·DMF}_n（2）,通过单晶X射线衍射,红外光谱,元素分析,热重分析和粉末X射线衍射对其结构进行了表征。单晶X射线衍射分析表明化合物1属于三斜晶系,P1空间群,表现出三维（3,8）连接的网状结构,拓扑符号为：{4³}₂·{4⁶·6¹⁸·8⁴}·{6};化合物2也属于三斜晶系,P1空间群,为二维（3,6）连接的网络层状结构,拓扑符号为：{4³}₄·{4⁶·6¹⁸·8⁴}。此外,荧光性质研究表明固态化合物¹在室温条件下发射出源于TCPB^3-和4,4''-BPY配体的淡蓝色荧光,而化合物2在相似的条件下没有荧光发射。     

三个二羧酸配体配位聚合物的合成、结构表征和荧光性质

以羧酸配体2,2''-（1,4-亚苯基双（亚甲基））双（硫二基）二苯甲酸（H₂L¹）和2,2''-（2,3,5,6-四甲基-1,4-亚苯基）双（亚甲基）双（硫二基）二苯甲酸（H₂L²）分别与金属盐反应,通过溶剂热方法合成了3个配位聚合物：{[Ni（L¹）（H₂O）₄]·2H₂O}_n （1）、[Zn（L¹）（DMA）₂]_n （2）和[Co（L²）（DMF）₂]_n （3）,其中DMA=N,N-二甲基乙酰胺,DMF=N,N-二甲基甲酰胺。对配合物1~3进行了单晶X射线衍射、元素分析、红外光谱、热重分析、粉末X射线衍射和固体紫外可见光谱测试和表征。单晶X射线衍射表明：3个配合物均为一维锯齿形链状结构,并通过氢键作用形成三维骨架,且配体均表现为反式构象。此外,对配合物2固态荧光性质进行了研究。     

Synthesis,characterization, and catalytic activity of heterometallic ion-pair Ni/Mn and Ni/Zn complexes

Two new heterometallic compounds, [Ni(bpy)₃][Mn(NCO)₄]·H₂O (1) and [Ni(phen)₃]₂[Zn(NCO)₄]₂·4DMSO·H₂O (2) [bpy?=?2,2′-bipyridine and phen?=?1,10-phenanthroline], have been synthesized and characterized. The structures of 1 and 2 were solved by single-crystal X-ray diffraction analysis. The cationic moieties of [Ni(bpy)₃]²⁺ in 1 and [Ni(phen)₃]²⁺ in 2 show octahedral environments around Ni(II), whereas the anionic groups of [Mn(NCO)₄]^2? in 1 and [Zn(NCO)₄]^2? in 2 exhibit tetrahedral geometry around the Mn(II) and Zn(II), respectively. Both compounds are catalysts in the H/D exchange of salicylaldehyde in DMSO-d₆ which takes place under mild conditions and short reaction time.