Structural Diversity and Fluorescence Regulation of Three ZnII Coordination Polymers Assembled from Mixed Ligands Tectons

2015 ◽  
Vol 68 (5) ◽  
pp. 758 ◽  
Author(s):  
Ling-Yun Xin ◽  
Guang-Zhen Liu ◽  
Lu-Fang Ma ◽  
Xue Zhang ◽  
Li-Ya Wang
Keyword(s):  
Coordination Polymers ◽  
Three Dimensional ◽  
Emission Spectra ◽  
Structural Diversity ◽  
Double Layers ◽  
Photoluminescence Properties ◽  
X Ray Diffraction ◽  
Mixed Ligands ◽  
Structural Differences ◽  
Diffraction Patterns

By adopting a mixed-ligand strategy, three ZnII coordination polymers were prepared by hydrothermal reactions of zinc(ii) acetate with flexible 1,2-phenylenediacetic acid (H2phda) combining with three nitrogen-rich tectons namely, [Zn2(phda)2(bpo)2]n·2H2O (1), [Zn(phda)(pytz)]n (2), and [Zn(phda)(bib)]n·H2O (3) (where bpo = 2,5-bis(4-pyridyl)-1,3,4-oxadiazole, pytz = 3,5-di(4-pyridyl)-1,2,4-triazole, and bib = 1,4-bis(imidazol-1-yl)benzene). The single-crystal X-ray diffraction patterns reveal that the three compounds contain metal(ii)-carboxylate chains further extended by such nitrogen-rich co-ligands to afford a vast diversity of structures from two-dimensional (2D) stepwise grids (1), 2D double layers (2), to three-dimensional (3D)→3D 4-fold interpenetrating diamondoid networks. Furthermore, the structural differences in these complexes are primarily affected by the introduction of N-donor ancillary co-ligands so that their solid-state photoluminescence properties exhibit various emission spectra. Especially, compound 3 shows a guest-sensitive luminescence behaviour, which may be useful in applications as guest sensors.

Three Coordination Polymers Built by Methoxyphenyl Imidazole Dicarboxylate: Solvothermal Syntheses, Crystal Structures, and Properties

2015 ◽  
Vol 68 (6) ◽  
pp. 956 ◽  
Author(s):  
Ming-An Dang ◽  
Zi-Feng Li ◽  
Ying Liu ◽  
Gang Li
Keyword(s):  
Coordination Polymers ◽  
Three Dimensional ◽  
Photoluminescence Properties ◽  
X Ray Diffraction ◽  
Bridging Ligands ◽  
X Ray ◽  
Structures And Properties ◽  
Solvothermal Syntheses ◽  
Lattice Polymer ◽  
Imidazole Dicarboxylate

Three coordination polymers [Sr(p-H2MOPhIDC)2]n (1) (p-H3MOPhIDC = 2-p-methoxyphenyl-1H-imidazole-4,5-dicarboxylic acid), {[Cd2(p-HMOPhIDC)2(4,4′-bipy)]⋅H2O}n (4,4′-bipy = 4,4′-bipyridine) (2), and [Zn(p-HMOPhIDC)(4,4′-bipy)]n (3) have been solvothermally synthesized, and structurally characterized by single-crystal X-ray diffraction. Polymer 1 indicates a three-dimensional framework, which can be simplified as a 6-connected lattice. Polymer 2 is also a three-dimensional framework, and contains mixed bridging ligands HMOPhIDC2– and 4,4′-bipy. Polymer 3 exhibits a sheet structure bearing infinite rectangles. The coordination modes of the p-H3MOPhIDC ligand, and the thermal and solid-state photoluminescence properties of the polymers have been investigated as well.

Lanthanide coordination polymers based on designed bifunctional 2-(2,2′:6′,2″-terpyridin-4′-yl)benzenesulfonate ligand: syntheses, structural diversity and highly tunable emission

2019 ◽  
Vol 75 (5) ◽  
pp. 855-864 ◽  
Author(s):  
Yi-Chen Hu ◽  
Chao Bai ◽  
Huai-Ming Hu ◽  
Chuan-Ti Li ◽  
Tian-Hua Zhang ◽  
...  
Keyword(s):  
Dicarboxylic Acid ◽  
Coordination Polymers ◽  
Emission Spectra ◽  
Green Emission ◽  
Structural Diversity ◽  
X Ray Diffraction ◽  
Hydrothermal Conditions ◽  
Lanthanide Coordination Polymers ◽  
Connected Node ◽  
Tunable Emission

Seven novel lanthanide coordination polymers, [Eu(STP)(glu)] n (1), [Ln4(STP)2(glu)5] n ·4nH2O [Ln = Er (2), Yb (3)], [Ln(STP)(1,3-bdc)] n ·0.5nH2O [Ln = Tb (4), Yb (5)], and [Ln(STP)(1,2-bdc)] n [Ln = Eu (6), Tb (7)] [NaSTP = sodium 2-(2,2′:6′,2″-terpyridin-4′-yl)benzenesulfonate, H2glu = glutaric acid, H2(1,3-bdc) = benzene-1,3-dicarboxylic acid, H2(1,2-bdc) = benzene-1,2-dicarboxylic acid], have been prepared under hydrothermal conditions and characterized by elemental analysis, IR and single-crystal X-ray diffraction. Compound (1) possesses a 2D layered structure based on 1D chains with STP− and glu2− anions acting as bridges. Compounds (2) and (3) are isomorphous and show a rare 3D tcj/hc net with a tetranuclear Ln3+ unit regarded as a seven-connected node and a glu2− anion serving as a three-connected node. Compounds (4) and (5) are isomorphous and exhibit six-connected pcu nets by denoting binuclear units to six-connected nodes. Compounds (6) and (7) display 3D 3,5T1 nets with (1,2-bdc)2− anions and dimetallic units serving as three- and five-connected nodes, respectively. The Eu compounds (1) and (6) demonstrate typically red emission, while the Tb compounds (4) and (7) exhibit characteristic green emission. The emission spectra of heteronuclear compounds [Eu x Tb1−x (STP)(1,2-bdc)] n (0 ≤ x ≤ 1) as efficient luminescent tags were investigated. The intermetallic energy transfer of Tb to Eu was also evaluated.

Structural diversity and luminescence properties of coordination polymers based on mixed ligands, 2,5-bis(imidazol-1-yl)thiophene (thim2) and aromatic multicarboxylates

CrystEngComm ◽  
2014 ◽  
Vol 16 (34) ◽  
pp. 7914-7925 ◽  
Author(s):  
Namita Singh ◽  
Ganapathi Anantharaman
Keyword(s):  
Solid State ◽  
Coordination Polymers ◽  
Structural Diversity ◽  
Luminescence Properties ◽  
Photoluminescence Properties ◽  
Mixed Ligands ◽  
3D Network

Seven new CPs, exhibiting 2D herringbone pleated (1, 3–4), parallel pleated (2), layer (5–6) structure and 3D network (7) have been synthesized. Solid-state photoluminescence properties for CP 1, 4 and 6 have been investigated.

scholarly journals A Flexible Aromatic Tetracarboxylate as a New Linker for Coordination Polymers

Crystals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 84 ◽  
Author(s):  
Wenjun Gu ◽  
Jinzhong Gu ◽  
Alexander M. Kirillov
Keyword(s):  
Coordination Polymers ◽  
Diphenyl Ether ◽  
Three Dimensional ◽  
Polymer Materials ◽  
Tetracarboxylic Acid ◽  
X Ray Diffraction ◽  
X Ray ◽  
Molar Ratios ◽  
Structural Differences ◽  
Topological Framework

Two new cadmium(II)-based materials, featuring two-dimensional (2D) [Cd2(μ6-deta)(bpy)(H2O)]n (1) and three-dimensional (3D) [Cd2(μ5-deta)(bpy)2(H2O)]n (2) structures, were constructed by the hydrothermal method from 2,3′,4′,5-diphenyl ether tetracarboxylic acid (H4deta) as an unexplored linker in research on coordination polymers (CPs) and 2,2′-bipyridine (bpy) as a mediator of crystallization. Microcrystalline samples of 1 and 2 were analyzed by IR/PXRD/EA/TGA and X-ray diffraction using single crystals. Structures and topologies of CPs 1 and 2 were established, revealing a 4,6L45 topological layer in 1 and a 3,5T1 topological framework in 2. Structural differences for 1 and 2 are attributed to distinct molar ratios between Cd2+ and bpy during the hydrothermal synthesis. Luminescence and thermal behavior of the obtained materials were also investigated. The present work opens up the use of an unexplored 2,3′,4′,5-diphenyl ether tetracarboxylic acid as a versatile and flexible linker toward the generation of functional coordination polymer materials.

A new CdII coordination polymer with a self-penetrating architecture induced by the molecular conformation of a rigid bithiophene ligand

2018 ◽  
Vol 74 (2) ◽  
pp. 218-223 ◽  
Author(s):  
Ning-Ning Ji ◽  
Zhi-Qiang Shi ◽  
Hai-Liang Hu
Keyword(s):  
Coordination Polymer ◽  
Single Crystal ◽  
Coordination Polymers ◽  
Molecular Conformation ◽  
Topological Analysis ◽  
Three Dimensional ◽  
X Ray Diffraction ◽  
X Ray ◽  
Design And Synthesis ◽  
Mixed Ligands

The design and synthesis of coordination polymers with a self-penetrating architecture has attracted much interest not only due to their interesting structures but also due to their potential applications. 5,5′-Bis(pyridin-4-yl)-2,2′-bithiophene (bpbp), as a conjugated bithiophene ligand, can exhibit trans and cis conformations and this can lead to the construction of a self-penetrating architecture. In addition, the semi-rigid ancillary ligand 4,4′-oxybis(benzoic acid) (H2oba) can adopt different coordination modes, resulting in coordination polymers with high-dimensional skeletons. A new CdII coordination polymer based on mixed ligands, namely poly[diaquapentakis[μ-5,5′-bis(pyridin-4-yl)-2,2′-bithiophene-κ2 N:N′]bis(nitrato-κ2 O,O′)tetrakis(μ3-4,4′-oxydibenzoato)-κ10 O:O,O′:O′′,O′′′;κ6 O:O′:O′′-pentacadmium(II)], [Cd5(C14H14O5)4(NO3)2(C18H12N2S2)5(H2O)2] n , (I), has been synthesized under solvothermal conditions and characterized by single-crystal X-ray diffraction, IR spectroscopy and elemental analysis. Single-crystal X-ray diffraction indicates that there are three crystallographically independent CdII cations, three bpbp ligands, two deprotonated oba2− ligands, one nitrate ligand and one coordinated water molecule in the asymmetric unit. One CdII centre is seven-coordinated, exhibiting a distorted {CdN2O5} pentagonal bipyramidal geometry, while the other two Cd centres are both six-coordinated, showing slightly distorted {CdN2O4} octahedral geometries. The most interesting feature is the co-existence of trans and cis conformations in a single net, allowing structural interpenetration via self-threading and yet the expected self-penetrating structure was obtained. Topological analysis shows that the whole three-dimensional framework can be classified as a 3-nodal (4,6,6)-c net with Schläfli symbol {613.82}2{66}, which is a new topology. Furthermore, the luminescence properties of (I) were examined in the solid state at room temperature.

Effects of two benzenedicarboxylic acids on the construction of CdII coordination polymers incorporating a flexible N-donor ligand

2019 ◽  
Vol 75 (6) ◽  
pp. 643-649 ◽  
Author(s):  
Xiao-Fei Li ◽  
Di Cheng ◽  
Xiang-Ru Meng ◽  
Huai-Xia Yang
Keyword(s):  
Coordination Polymers ◽  
Dicarboxylic Acids ◽  
X Ray Diffraction ◽  
X Ray ◽  
Mixed Ligands ◽  
Structural Framework ◽  
Dimensional Network ◽  
Metal Organic ◽  
Aromatic Dicarboxylic Acids ◽  
Diffraction Patterns

Compared with the monomorphic type of ligand, combining mixed ligands in one coordination polymer offers greater tunability of the structural framework. Employment of N-heterocyclic ligands and aromatic polycarboxylates is an effective approach for the construction of metal–organic frameworks (MOFs). Two new coordination polymers incorporating both 2-[(1H-imidazol-1-yl)methyl]-1H-benzimidazole (imb) and benzenedicarboxylic acid isomers, namely, catena-poly[[[di-μ-chlorido-bis[(2-carboxybenzoato-κ2 O 1,O 1′)cadmium(II)]]-bis{μ-2-[(1H-imidazol-1-yl)methyl]-1H-benzimidazole-κ2 N:N′}] dihydrate], {[Cd(C8H5O4)Cl(C11H10N4)]·H2O} n , (I), and poly[[aqua(μ2-benzene-1,3-dicarboxylato-κ3 O 1,O 1′:O 3){μ2-2-[(1H-imidazol-1-yl)methyl]-1H-benzimidazole-κ2 N:N′}cadmium(II)] dihydrate], {[Cd(C8H4O4)(C11H10N4)(H2O)]·2H2O} n , (II), have been prepared and structurally characterized by single-crystal X-ray diffraction. In polymer (I), imb ligands bridge CdII ions, forming a one-dimensional chain, and 2-carboxybenzoate anions coordinate to the CdII ions in a terminal fashion. Polymer (II) exhibits a two-dimensional network structure in which imb ligands and the benzene-1,3-dicarboxylate anions join CdII ions co-operatively. This indicates that changing of the aromatic dicarboxylic acids can result in polymers with different compositions and architectures. Moreover, their IR spectra, PXRD (powder X-ray diffraction) patterns, thermogravimetric analyses and fluorescence properties were also investigated.

Anion Effect on the Structural Diversity of 1-D and 2-D Zinc(II) Coordination Polymers with a Flexible Fluorinated Bis(imidazole) Ligand

2014 ◽  
Vol 69 (8) ◽  
pp. 878-884 ◽  
Author(s):  
Feng Tian ◽  
Hong-Dan Wang ◽  
Ming-Yang He ◽  
Qun Chen ◽  
Sheng-Chun Chen
Keyword(s):  
Coordination Polymers ◽  
Structural Diversity ◽  
Coordination Geometry ◽  
Tetrahedral Coordination ◽  
X Ray Diffraction ◽  
X Ray ◽  
Anion Effect ◽  
Structural Differences ◽  
The Difference ◽  
Cationic Network

Reactions of a flexible fluorinated ligand, 2,3,5,6-tetrafluoro-1,4-bis(imidazol-1-ylmethyl) benzene (Fbix), with ZnX2 (X =OAc- or NO3-) lead to the formation of the two new ZnII coordination polymers [Zn(Fbix)(OAc)2]n (1) and {[Zn2(Fbix)3(NO3)2](NO3)2(H2O)3}n (2), which have been characterized by elemental analysis, IR spectroscopy, and single-crystal X-ray diffraction. Although the ZnII centers of both 1 and 2 are in a similar tetrahedral coordination geometry, each ZnII ion in 1 is surrounded by two Fbix spacers and two terminal OAc- anions to form a highly undulated chain, whereas each ZnII ion in 2 is embraced by three Fbix ligands and one NO3- anion to result in a two-dimensional cationic network. Since 1 and 2 are synthesized under the same conditions, the structural differences between them are attributable to the difference of the counterions. The solid-state properties such as thermal stability and luminescence of 1 and 2 have also been studied briefly.

2D X-ray diffraction and molecular modelling of the crystalline structure of polyesters under uniaxial stress

2021 ◽  
pp. 096739112199822
Author(s):  
Ahmed I Abou-Kandil ◽  
Gerhard Goldbeck
Keyword(s):  
Crystalline Structure ◽  
Molecular Modelling ◽  
Three Dimensional ◽  
Uniaxial Stress ◽  
X Ray Diffraction ◽  
X Ray ◽  
Wide Range ◽  
Modelling Techniques ◽  
Diffraction Patterns

Studying the crystalline structure of uniaxially and biaxially drawn polyesters is of great importance due to their wide range of applications. In this study, we shed some light on the behaviour of PET and PEN under uniaxial stress using experimental and molecular modelling techniques. Comparing experiment with modelling provides insights into polymer crystallisation with extended chains. Experimental x-ray diffraction patterns are reproduced by means of models of chains sliding along the c-axis leading to some loss of three-dimensional order, i.e. moving away from the condition of perfect register of the fully extended chains in triclinic crystals of both PET and PEN. This will help us understand the mechanism of polymer crystallisation under uniaxial stress and the appearance of mesophases in some cases as discussed herein.

scholarly journals Synthesis, Crystal Structure, and Properties of a New Coordination Polymer Built from N/O-Donor Mixed Ligands

Crystals ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 372
Author(s):  
Mei-An Zhu ◽  
Shuai-Shuai Han ◽  
Feng Deng ◽  
Jia-Le Li ◽  
Shui-Sheng Chen
Keyword(s):  
Coordination Polymer ◽  
Weak Interactions ◽  
Three Dimensional ◽  
Luminescent Properties ◽  
Tridentate Ligand ◽  
Supramolecular Polymer ◽  
X Ray Diffraction ◽  
X Ray ◽  
Mixed Ligands ◽  
Benzenedicarboxylic Acid

The coordination polymer, namely, [Cd(H2L)(nobda)]n (1) was prepared by the reaction of Cd(NO3)2·4H2O with 4-amino-1,2-benzenedicarboxylic acid (H2nobda) and 1,4-di(1H-imidazol-4-yl)benzene (H2L), and characterized by single-crystal X-ray diffraction, elemental analysis, infrared (IR) spectroscopy, thermogravimetric analysis, and powder X-ray diffraction (PXRD). The carboxylic acid of H2nobda ligands was completely deprotonated to be nobda2− anions, which act as tridentate ligand to connect the Cd2+ to form two-dimensional (2D) network, while the neutral H2L ligands serve as a linear didentate bridge to connect two adjacent Cd2+ ions upper and down the 2D layer. The adjacent 2D layers were further linked into the three-dimensional (3D) supramolecular polymer by the weak interactions such as hydrogen bonds and π−π stacking interactions. The ultraviolet-visible (UV-vis) absorption spectra and luminescent properties in the solid state at room temperature have been investigated.

The structural diversity and photoluminescent properties of cadmium thiophenedicarboxylate coordination polymers

2014 ◽  
Vol 43 (19) ◽  
pp. 7219-7226 ◽  
Author(s):  
Li-Ping Xue ◽  
Xin-Hong Chang ◽  
Shi-Hui Li ◽  
Lu-Fang Ma ◽  
Li-Ya Wang
Keyword(s):  
Thermal Stability ◽  
Coordination Polymers ◽  
Structural Diversity ◽  
Donor Ligands ◽  
Photoluminescence Properties

Two series of Cd(ii) CPs based on two positional isomeric thiophenedicarboxylic acids and N-donor ligands have been synthesized. Moreover, the thermal stability and photoluminescence properties of these complexes are investigated.

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