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Coordination polymer

About: Coordination polymer is a research topic. Over the lifetime, 11988 publications have been published within this topic receiving 212219 citations.


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TL;DR: Examination of photophysical properties of 1-7 indicates that the fluorescence emission of Me(2)biim has been effectively enhanced, quenched, or shifted in its metal complexes 1- 7.
Abstract: Reaction of ZnCl2 and Me2biim (Me2biim = N,N‘-dimethyl-2,2-‘-biimidazole) in acidic or neutral aqueous solutions gave the noncoordinated ZnCl4·H2Me2biim (1) or the double Me2biim bridged [Zn2Cl4(μ-Me2biim)2] (2). Use of CdX2 (X = Cl, Br, I) instead of ZnCl2 yielded the single Me2biim bridged one-dimensional coordination polymer [CdX2(μ-Me2biim)]n (X = Cl, 3; Br, 4; I, 5). The stacking of the infinite chains are dominated by C−H···X interactions in 3 and 4 but by I···I interactions in 5, responsible for their different crystal structures. Use of Zn(NO3)2 instead of ZnCl2 produced the novel triple Me2biim-bridged [Zn2(μ-Me2biim)3(H2O)2](NO3)4·H2O (6). The unprecedented hexa-Me2bim bridged trinuclear [Cd3(μ-Me2biim)8]2(ClO4)12(H2O)6 (7) was obtained by using Cd(CH3CO2)2 in the presence of NaClO4. Compounds 1−7 were characterized by X-ray crystallography and IR. Examination of photophysical properties of 1−7 indicates that the fluorescence emission of Me2biim has been effectively enhanced, quenched, or shifte...

79 citations

Journal ArticleDOI
TL;DR: It is reported and the structures of and determined by X-ray crystallography of a new lead(II) coordination polymer with ligands 8-hydroxyquinoline (8-Quin) and nitrate are reported.

79 citations

Journal ArticleDOI
TL;DR: In this paper, the first piezochromic metal-viologen material and the modulation of the pressure-responsive behavior through coordination structures were presented by means of ultraviolet-visible spectroscopy, X-ray photoelectron spectrogrammy, electron paramagnetic resonance, in situ/ex situ Xray diffraction and DFT calculations.
Abstract: While stimuli-responsive chromic phenomena are well known for various viologen-containing organic and metal–organic materials, viologen-based piezochromism is a very recent discovery in organic compounds. Here we present the first piezochromic metal–viologen material and the modulation of the pressure-responsive behavior through coordination structures. By means of ultraviolet-visible spectroscopy, X-ray photoelectron spectroscopy, electron paramagnetic resonance, in situ/ex situ X-ray diffraction and DFT calculations, we demonstrated that a zigzag-chain CdII coordination polymer (1) with a viologen-dicarboxylate zwitterionic ligand shows reversible piezochromism, with modulations in threshold pressure and visible-light absorption (color) compared with the free ligand. We also illustrated that piezochromism can be suppressed upon coordination of the same ligand in a rigid 3D framework with the same metal ion. Two basic requirements were proposed from viologen-based piezochromism: appropriate donor–acceptor contacts providing electron transfer pathways, and structural flexibility allowing pressure to further reduce the contacts. We expect great prospects in tuning piezochromism and designing new pressure-responsive materials through diverse metal–viologen combinations. The very fast photochromic response of compound 1 at ambient pressure was also studied, which was attributed to the rather short donor–acceptor contacts in the structure.

79 citations

Journal ArticleDOI
TL;DR: The synthesis and low temperature crystal structures of [Ag(quinoxaline)]n(NO3)n, 1, [Ag (2,5-dimethylpyrazine)(NO3)]n, 2 and [Ag4(3-aminopyridine)4( NO3)4]n 3 are presented.
Abstract: The synthesis and low temperature crystal structures of [Ag(quinoxaline)]n(NO3)n, 1, [Ag(2,5-dimethylpyrazine)(NO3)]n, 2 and [Ag4(3-aminopyridine)4(NO3)4]n3 are presented. The quinoxaline compound forms a 1D coordination polymer with the characteristic linear 2-coordination figure of silver(I), the N–Ag–N angle being 164.2(1)°, and only weak silver–nitrate interactions. In addition there is an interaction giving pairs of parallel chains as the main structural theme. The 2,5-dimethylpyrazine compound has approximately trigonal-planar coordination, also binding one nitrate at the relatively short Ag–O distances 2.444(3) A and 2.484(3) A, respectively, for the two crystallographically different silver atoms. This also results in a 1D coordination polymer that, despite the large differences in the Ag(I) coordination environment, is isostructural with 1. [Ag4(3-aminopyridine)4(NO3)4]n3 forms a 2D coordination polymer by bridging nitrate ions. The antimicrobial activity of 1–3, and also of [Ag3(2-aminopyridine)4](NO3)3, 4 was screened for 13 different pathogens and substantial activity was shown for 1 against Escherichia coli and Pseudomonas aeruginosa (MIC 4 µg cm−3) and somewhat lower activity was registered against Sarcina lutea and Salmonella typhi for 1, Bordetella bronchiseptica for 2, Salmonella typhi and Pseudomonas aeruginosa for 3, and Escherichia coli and Shigella sonnie for 3 (MIC 8 µg cm−3). Only low activity was shown against the yeast Candida albicans for 1, 2 and 4 whereas no activity against this pathogen was registered for 3.

79 citations

Journal ArticleDOI
TL;DR: A porous coordination polymer containing zinc, 1,2,4-triazolate, and tetrafluoroterephthalate displays a high hydrogen adsorption enthalpy of 8 kJ/mol, as a result of fluorine atoms exposed to the pore surface and the structure's small pore size as mentioned in this paper.
Abstract: A porous coordination polymer containing zinc, 1,2,4-triazolate, and tetrafluoroterephthalate displays a high physisorptive hydrogen adsorption enthalpy of 8 kJ/mol, as a result of fluorine atoms exposed to the pore surface and the structure's small pore size.

79 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023152
2022360
2021576
2020657
2019663
2018688