两个基于4-(1H-1,2,4-三氮唑)苯甲酸的稀土配位聚合物的合成、晶体结构及荧光性质(英文)

以4-(1H-1,2,4-三氮唑)苯甲酸为配体,采用水热法合成了2种稀土配位聚合物[Tb(tbc3)(H2O)3]n(1)和{[Nd(tbc3)(H2O)3]·H2O}n(2)(Htbc=4-(1H-1,2,4-三氮唑)苯甲酸)。运用X-射线单晶衍射法对该配位聚合物进行了结构测定,并对其进行了元素分析、红外光谱、TG及荧光光谱表征。单晶结构表明,配位聚合物1为三斜晶系,空间群P1,配位聚合物2属于单斜晶系,空间群为P21/c。配位聚合物1和2均为一维链结构,均通过非共价键作用形成三维超分子构造。     

基于双(1,2,4-三氮唑基)刚性配体和芳香羧酸的两个配位聚合物的合成、晶体结构及荧光性质

水热条件下,合成了2个结构新颖的金属配位聚合物:[Co_1.5(btb)₂(nbta)(H₂O)₂]_n(1),[Cd(btb)_0.5(nph)(H₂O)]_n(2)(btb=4,4'-二(1,2,4-三氮唑-1-基)联苯,H₃nbta=5-硝基-1,2,3-苯三甲酸,H₂nph=3-硝基邻苯二甲酸)并对它们进行了元素分析,红外光谱及X-射线单晶衍射等表征。结构分析表明,化合物1是一个二维(3,4)-连接3,4L90拓扑结构,并进一步通过O-H…O氢键作用构筑成三维超分子结构。而配合物2是一个三维(3,4,4)-连接的sqc69网络,它的拓扑符号为(4.8²)₂(4².8².10²)(8.10⁴.12)。此外,还研究了这两个配合物的热重和荧光性质。     

基于双(1,2,4-三氮唑基)刚性配体和芳香羧酸的两个配位聚合物的合成、晶体结构及荧光性质

水热条件下,合成了2个结构新颖的金属配位聚合物:[Co_1.5(btb)₂(nbta)(H₂O)₂]_n(1),[Cd(btb)_0.5(nph)(H₂O)]_n(2)(btb=4,4'-二(1,2,4-三氮唑-1-基)联苯,H₃nbta=5-硝基-1,2,3-苯三甲酸,H₂nph=3-硝基邻苯二甲酸)并对它们进行了元素分析,红外光谱及X-射线单晶衍射等表征。结构分析表明,化合物1是一个二维(3,4)-连接3,4L90拓扑结构,并进一步通过O-H…O氢键作用构筑成三维超分子结构。而配合物2是一个三维(3,4,4)-连接的sqc69网络,它的拓扑符号为(4.8²)₂(4².8².10²)(8.10⁴.12)。此外,还研究了这两个配合物的热重和荧光性质。     

两个基于4-（1H-1，2，4-三氮唑）苯甲酸的稀土配位聚合物的合成、晶体结构及荧光性质

以4-（1H-1,2,4-三氮唑）苯甲酸为配体,采用水热法合成了2种稀土配位聚合物[Tb（tbc₃）（H₂O）₃]_n（1）和{[Nd（tbc₃）（H₂O）₃]·H₂O}_n（2）（Htbc=4-（1H-1,2,4-三氮唑）苯甲酸）。运用X-射线单晶衍射法对该配位聚合物进行了结构测定,并对其进行了元素分析、红外光谱、TG及荧光光谱表征。单晶结构表明,配位聚合物1为三斜晶系,空间群P1,配位聚合物2属于单斜晶系,空间群为P2₁/c。配位聚合物1和2均为一维链结构,均通过非共价键作用形成三维超分子构造。     

2-(1H-1，2，4-三氮唑)乙酸-稀土配合物的合成与结构

利用柔性含氮配体羧酸2-(1H-1,2,4-三氮唑)乙酸(HL)与稀土氧化物在水热条件下反应得到了2个稀土配位聚合物 [Gd(L)₃H₂O]_n(1)和[Nd(L)₃H₂O]_n(2)。利用元素分析、红外光谱、X射线单晶衍射结构分析等方法对其进行了表征。晶体结构表明2个配合物晶体同属三斜晶系,空间群P1,具有一维链状结构。     

5-取代-1H-1,2,4-三氮唑-3-羧酸的合成及结构表征

以5-氨基-1H-1，2，4-三氮唑-3-羧酸为原料，经重氮化反应和Sandmeyer反应得到5-X(X=Cl，Br，I，CN)-1H-1，2，4-三氮唑-3-羧酸，通过元素分析、UV，IR，1H NMR和MS对所有产物的结构进行了表征。     

福司氟康唑杂质——2-(2,4-二氟苯基)-1-(1H-1,2,4-三氮唑-1-基)-3-(4H-1,2,4-三氮唑-4-基)-2-丙基磷酸二氢酯的合成

以1,3-二氟苯为起始原料,依次经傅－克酰基化,1H-三氮唑取代,环氧化,胺解,4H-三氮唑环化,磷酸酯化和钯碳加氢反应等7步反应合成了福司氟康唑的主要杂质--2-(2,4-二氟苯基-1-(1H-1,2,4-三氮唑-1-基)-3-(4H-1,2,4-三氮唑-4-基)-2-丙基磷酸二氢酯,纯度98%,总收率7.8%,其结构经¹H NMR确证。     

4-(4-羧基苯氧基)间苯二甲酸构筑的过渡金属配位聚合物:合成、晶体结构、荧光传感与光催化

采用水热法合成了4个配位聚合物[Zn(Hcpoia)(2,2’-bpy)·H₂O]_n(1)和[M(Hcpoia)(phen)]_n·nH₂O[M=Zn(2),Mn(3),Co(4); H₃cpoia=4-(4-羧基苯氧基)间苯二甲酸; 2,2’-bpy=2,2’-联吡啶; phen=1,10-邻菲罗啉],利用X射线单晶衍射分析确定了配合物的晶体结构。配合物1为一维链状结构,中心Zn²⁺离子的配位环境为[ZnO₄N₂]扭曲的八面体构型,配体Hcpoia^2-以μ₁∶η¹η⁰和μ₁∶η¹η¹配位模式桥连相邻的Zn²⁺离子。配合物2和4的结构与配合物1类似,是由配体Hcpoia^2-以μ₁∶η¹     

基于4-(1-咪唑基)苯甲酸配体构筑的一个单一配体和两个混和配体配位聚合物的结构与性质

以4-(1-咪唑基)-苯甲酸(HIBA)为配体,与Cu(NO_3)2·6H_2O和Cd(Ac)_2·2H_2O在加入或不加入5-硝基间苯二甲酸(H_2NPA)的情况下,通过水热法得到了3个新的配位聚合物,分别为{[Cu(IBA)_2]·DMF}n(1)、{[Cd(IBA)2(H_2O)]·3H_2O}n(2)和[Cd_3(IBA)_2(NPA)_2]n(3)。配合物1和2分别为4重和3重穿插的具有金刚石拓扑网络的三维框架结构,配合物3是由混合配体形成的基于一维Cd-羧基次级构筑基元的三维框架结构,其一维构筑基元由Cd髤离子通过IBA-和NPA2-配体同时桥联形成的。此外,还表征了这些化合物的晶相纯度以及配合物2和3的荧光性质。     

基于5-甲氧基间苯二甲酸构筑的两个金属配位聚合物:晶体结构、荧光和催化性质

以5-甲氧基间苯二甲酸(CH_3O-H_2ip),2,2′-二甲基-4,4′-联吡啶(dmbpy)和四水硝酸镉/六水硝酸钴为原料,在混合溶剂中合成2个一维金属有机配位聚合物,{[Cd_2(CH_3O-ip)_2(ethanol)_2(H_2O)_4]·3H_2O}_n(1)和{[Co_2(CH_3O-ip)_2(dmbpy)(H_2O)_4]·H_2O·C_2H_3N}_n(2)(C_2H_3N=乙腈)。通过元素分析、红外光谱、差热分析、X射线粉末衍射和X射线单晶衍射等手段对配合物进行了结构表征。结果显示,化合物1为一维浪形结构,通过O-H…O分子间氢键作用构筑成二维结构;而2为一维梯形结构,通过O-H…O,O-H…N和C-H…O分子间氢键作用构筑成三维结构。常温固态下,考察了配合物1的荧光性质,并考查了化合物1和2对甲基橙的催化降解活性。     

Syntheses,crystal structures,and catalytic activities of three new Cu(II) coordination polymers based on 2-(1H-1,2,4-triazole)-1-acetic acid

Three new coordination polymers, {[Cu(trza)(2,2′-bipy)(H₂O)]?·?(ClO₄)} _n (1), {[Cu(trza)(2,2′-bipy)(H₂O)]?·?(BF₄)} _n (2), and {[Cu(trza)(4,4′-bipy)]?·?(H₂O)?·?(ClO₄)} _n (3) (Htrza?=?2-(1H-1,2,4-triazole)-1-acetic acid), have been synthesized and characterized by single-crystal X-ray diffraction analysis. Both 1 and 2 exhibit 1-D chain structure while 3 displays 2-D layer structure. The catalytic activities of 1 and 3 in the green oxidative coupling of 2,6-dimethylphenol have been investigated.     

Two 2-dimensional cadmium(II) coordination polymers with 3-amino-5-methylthio-1,2,4-triazolate ligand

Reactions of cadmium(II) salts with 3-amino-5-methylthio-1H-1,2,4-triazole (Hamstz) afforded two cadmium(II) coordination polymers, [Cd₂(amstz)₂Cl₂]_n (1) and [Cd₂(amstz)₂(NO₃)₂]_n (2). Compounds 1 and 2 feature 2-D layered structures based on the dinuclear [Cd₂(amstz)₂] subunits. The cadmium coordination polyhedra are tetrahedral and tetragonal pyramidal in 1 and 2, respectively, due to the presence of different coordinated anions, Cl^? and NO₃^?. Compounds 1 and 2 exhibit photoluminescence emission with maxima at 620 and 621 nm upon excitation at 470 and 472 nm, respectively, which can be attributed to the ligand-to-metal charge transfer emssion.     

Synthesis,structure and characterization of two copper(II) supramolecular coordination polymers based on a multifunctional ligand 2‐amino‐4‐sulfobenzoic acid

Copper(II) coordination polymers have attracted considerable interest due to their catalytic, adsorption, luminescence and magnetic properties. The reactions of copper(II) with 2‐amino‐4‐sulfobenzoic acid (H₂asba) in the presence/absence of the auxiliary chelating ligand 1,10‐phenanthroline (phen) under ambient conditions yielded two supramolecular coordination polymers, namely (3‐amino‐4‐carboxybenzene‐1‐sulfonato‐κO¹)bis(1,10‐phenanthroline‐κ²N,N′)copper(II) 3‐amino‐4‐carboxybenzene‐1‐sulfonate monohydrate, [Cu(C₇H₆N₂O₅S)(C₁₂H₈N₂)₂](C₇H₆N₂O₅S)·H₂O, (1), and catena‐poly[[diaquacopper(II)]‐μ‐3‐amino‐4‐carboxylatobenzene‐1‐sulfonato‐κ²O⁴:O^4′], [Cu(C₇H₆N₂O₅S)(H₂O)₂]_n, (2). The products were characterized by FT–IR spectroscopy, thermogravimetric analysis (TGA), solid‐state UV–Vis spectroscopy and single‐crystal X‐ray diffraction analysis, as well as by variable‐temperature powder X‐ray diffraction analysis (VT‐PXRD). Intermolecular π–π stacking interactions in (1) link the mononuclear copper(II) cation units into a supramolecular polymeric chain, which is further extended into a supramolecular double chain through interchain hydrogen bonds. Supramolecular double chains are then extended into a two‐dimensional supramolecular double layer through hydrogen bonds between the lattice Hasba⁻ anions, H₂O molecules and double chains. Left‐ and right‐handed 2₁ helices formed by the Hasba⁻ anions are arranged alternately within the two‐dimensional supramolecular double layers. Complex (2) exhibits a polymeric chain which is further extended into a three‐dimensional supramolecular network through interchain hydrogen bonds. Complex (1) shows a reversible dehydration–rehydration behaviour, while complex (2) shows an irreversible dehydration–rehydration behaviour.     

Two new cadmium(II) coordination polymers based on imidazole‐containing ligands: synthesis,structural characterization and fluorescence properties

The judicious selection of suitable ligands is vitally important in the construction of novel metal–organic frameworks (MOFs) with fascinating structures and interesting properties. Recently, imidazole‐containing multidentate ligands have received much attention. Two new Cd^II coordination frameworks, namely, poly[tris{μ‐1,4‐bis[(1H‐imidazol‐1‐yl)methyl]benzene‐κ²N³:N^3′}tetrakis(nitrato‐κ²O,O′)dicadmium], [Cd₂(NO₃)₄(C₁₄H₁₄N₄)₃]_n, (I), and poly[[bis{μ₃‐1,3,5‐tris[(1H‐imidazol‐1‐yl)methyl]benzene‐κ³N³:N^3′:N^3′′}cadmium] hexafluorosilicate], {[Cd(C₁₈H₁₈N₆)₂](SiF₆)}_n, (II), have been synthesized and characterized by elemental analysis, IR spectroscopy and single‐crystal X‐ray diffraction. In polymer (I), the 1,4‐bis[(1H‐imidazol‐1‐yl)methyl]benzene ligand bridges Cd²⁺ ions with a distorted seven‐coordinated pentagonal bipyramidal geometry, forming a one‐dimensional ladder chain, and the nitrate anions coordinate to the Cd²⁺ ions in a terminal bidentate fashion. In the crystal, adjacent chains are further connected by C—H…O hydrogen bonds to generate a two‐dimensional (2D) supramolecular structure. Polymer (II) exhibits a 2D layered structure in which 1,3,5‐tris[(1H‐imidazol‐1‐yl)methyl] benzene ligands join Cd²⁺ centres having a six‐coordinated octahedral structure. The layers are connected by hexafluorosilicate anions via C—H…F hydrogen‐bond interactions, giving rise to a three‐dimensional supramolecular network structure in the solid state. In addition, powder X‐ray diffraction (PXRD) patterns were recorded, thermogravimetric analyses (TGA) carried out and fluorescence properties investigated.     

Synthesis,crystal structures and thermal stabilities of zinc coordination polymers containing the 3-hydrazino-4-amino-1,2,4-triazole ligand

Two zinc coordination polymers, {[Zn(HATr)₂](NO₃)₂}_n (1) and {[Zn₂(HATr)₄](ZnCl₄)(NO₃)₂·H₂O}_n (2), were synthesized from reactions of 3-hydrazino-4-amino-1,2,4-triazole dihydrochloride (HATr·2HCl) with Zn(NO₃)₂. The polymers were characterized by single-crystal X-ray diffraction, Fourier transform infrared spectroscopy (FTIR), elemental analysis, and differential scanning calorimetry. The crystal structures revealed that 1 and 2 have 1-D-chain structures, which were further assembled to form 3-D-frameworks by hydrogen bonds. Thermal analyses showed that these two compounds have thermal stability up to 280 °C. The energies of combustion, enthalpies of formation, critical temperatures of thermal explosion, entropies of activation (ΔS^≠), enthalpies of activation (ΔH^≠), and free energies of activation (ΔG^≠) were also measured and calculated. Furthermore, the sensitivities of 1 and 2 toward impact, friction, and static were determined, which revealed that 1 and 2 were less sensitive than Ni(N₂H₄)₃(NO₃)₂.     

Synthesis and characterization of calcium(II) coordination polymers based on phenylacetic acid

The syntheses, crystal structures, and thermal properties of the coordination polymers [Ca(H₂O)₂(L₁)₂]?·?H₂O (1) (L₁?=?4-methoxyphenylacetate) and [Ca(H₂O)₂(L₂)₂]?·?2H₂O (2) (L₂?=?2-chlorophenylacetate) are described. 1 and 2 can be dehydrated to the anhydrous [Ca(L₁)₂] (1a) or [Ca(L₂)₂] (2a), respectively. Compounds 1 and 2 crystallize in the non-centrosymmetric monoclinic space group P2₁ and the structures consist of a central Ca(II), two terminal waters, and two crystallographically unique L₁ (or L₂) anions, one of which functions as a chelating bidentate ligand. The second independent L₁ (or L₂) is tetradentate, coordinated in a μ₃-bridging mode leading to the formation of a 1-D coordination polymer. In the infinite chain extending along the b-axis, each Ca(II) is eight-coordinate and bonded to two terminal waters and six oxygens from four different L₁ or L₂ ligands.     

Syntheses, crystal structures and fluorescent properties of Cd(II), Hg(II) and Ag(I) coordination polymers constructed from 1H-1,2,4-triazole-1-acetic acid

Three new d¹⁰ coordination polymers, namely [Cd(taa)Cl]_n1, [Hg(taa)Cl]_n2, and [Ag_1.5(taa)(NO₃)_0.5]_n3 (taa=1H-1,2,4-triazole-1-acatate anion) have been prepared and characterized by elemental analysis, IR, and single crystal X-ray diffraction. Compound 1 consists of two-dimensional layers constructed by carboxyl-linked helical chains, which are further linked through carboxyl group to generate a unique 3D open framework. Topological analysis reveals that the structure of 1 can be classified as an unprecedented (3,8)-connected network with the Schläfli symbol (4.5²)₂(4².5⁸.6¹⁴.7³.8). Compound 2 manifests a doubly interpenetrated decorated α-polonium cubic network with the Schläfli symbol of (4¹⁰.6².8³). Compound 3 consists of 2D puckered layers made up of Ag centers and taa⁻ bridges. In addition, all of these compounds are photoluminescent in the solid state with spectra that closely resemble those of the ligand precursor.     

Crystal,molecular structure and tautomerism of (5-methyl-1H-[1,2,4]triazol-3-ylsulfanyl)-acetic acid

Molecular structure, relative stability of conformers, and tautomers of (5-methyl-1H-[1,2,4]triazol-3-ylsulfanyl)-acetic acid (MTSA) have been investigated by experimental (X-ray diffraction) and theoretical (B3LYP/aug-cc-pVDZ) methods. It was demonstrated that in the solid state MTSA exists in N1H tautomeric form. This tautomer is not the most stable in gas phase and its stabilization is provided by environment effects.     

Synthesis, Crystal Structure Determination, and Physicochemical Study of the Nickel(II) Complex of 4-(Pyridyl-2)-1,2,4-triazole

A new trinuclear nickel(II) complex with 4-(pyridyl-2)-1,2,4-triazole (pytrz), [Ni₃(pytrz)₆(H₂O)₆](NO₃)₆, has been synthesized, and its crystal structure has been determined. The compound was studied by X-ray phase analysis (XRPA), magnetochemical measurements, and electronic and IR spectroscopy.     

Pt(II) complexes of 4-amino-4H-1,2,4-triazole

The coordination ability of 4-amino-4H-1,2,4-triazole with Pt(II), both in solution and solid states, is elucidated by conventional and linear-polarized IR spectroscopy of oriented colloid suspensions in nematic host, ¹H- and ¹³C-NMR, UV-Vis spectroscopy, mass spectrometry (ESI and FAB), TGV, and DSC methods. The interpretation of the spectroscopic characteristics of corresponding metal complexes is obtained by comparison with free 4-amino-4H-1,2,4-triazole. In addition, quantum chemical calculations of the last compound are performed to obtain data for electronic structures and optical properties of the ligand, thus supporting the experimental elucidation. The evaluation of the cell viability on a panel of human tumor cell lines is made. The new Pt(II) complexes exerted cytotoxic effects in a concentration-dependent manner.