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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: In this paper, a new nano-sized Pb(II) one-dimensional coordination polymer with η 2 Pb-C interactions was synthesized and characterized by SEM, X-ray powder diffraction, IR spectroscopy and elemental analyses.
57 citations
TL;DR: Analysis of the two-step spin-crossover character in this compound suggests that covalent interactions through the spacer ligand do not provide the main mechanism of cooperativity.
Abstract: We report here on the synthesis and characterisation of a first iron(II) spin-crossover coordination polymer with the dca spacer ligand, having the formula [Fe(aqin)2(dca)]ClO4⋅MeOH (aqin=8-aminoquinoline, dca=dicyanamide), which displays a two-step complete spin transition. Variable-temperature magnetic susceptibility measurements and Mossbauer spectroscopy have revealed that the two relatively gradual steps are centred at 215 and 186 K and are separated by an inflection point at about 201 K, at which 50 % of the complex molecules undergo a spin transition. The two steps are related to the existence of two crystallographically inequivalent metal sites, as confirmed by the structural and Mossbauer studies. The crystal structure was resolved at 293 K (HS form) and 130 K (LS form). Both spin-state structures belong to the triclinic P space group (Z=2). The complex assumes a linear chain structure, in which the active iron(II) sites are linked to each other by anionic dicyanamide ligands acting as chemical bridges. The Fe–Fe distances through the dca ligand are 8.119(1) and 7.835(1) A in the high-spin and low-spin structures, respectively. The polymeric chains extend along a (1, 0, −1) axis and are packed in sheets, between which the perchlorate anions and methanol molecules are inserted. The complex molecules are linked together by π-stacking interactions and H-bonding between the H-donor aqin ligands and the perchlorate ions. These structural features provide a basis for cooperative interactions in the crystal lattice. Analysis of the two-step spin-crossover character in this compound suggests that covalent interactions through the spacer ligand do not provide the main mechanism of cooperativity.
57 citations
TL;DR: In this article, a mixed-lanthanide coordination polymer Eu0.0618Tb0.9382L was used as a self-referenced luminescent thermometer based on the intensity ratio of the two emissions (Tb3+ at 544 nm and Eu3 + at 613 nm).
Abstract: A mixed-lanthanide coordination polymer Eu0.0618Tb0.9382L as a self-referenced luminescent thermometer based on the intensity ratio of the two emissions (Tb3+ at 544 nm and Eu3+ at 613 nm) is more reliable than EuL/TbL based on one emission.
57 citations
TL;DR: In this article, cubane-like Cu 4 I 4 clusters are located at the nodes of the square-grid and connected to four ligands by Cu-S bonds forming a layer structure.
57 citations
TL;DR: In this article, a polyfluorinated-aromatic carboxylic acid has been designed and synthesized by the acylation reaction, tetrafluoro-bis(3,5-dicarboxyphenyl)terephthalamide (H4 bdtfa), which assembled with Zn2+ ions in the mixed solvents of DMF, py, and H2O under solvothermal conditions to produce a two-dimensional coordination polymer (CP), {[Zn2(bdtfa)(py)3(H2O
Abstract: A polyfluorinated-aromatic carboxylic acid has been designed and synthesized by the acylation reaction, tetrafluoro-bis(3,5-dicarboxyphenyl)terephthalamide (H4 bdtfa), which assembled with Zn2+ ions in the mixed solvents of DMF, py, and H2O under solvothermal conditions to produce a two-dimensional (2D) coordination polymer (CP), {[Zn2(bdtfa)(py)3(H2O)]·2DMF}n (1), (py = pyridine, DMF = N,N′-dimethylmethanamide). The final structure has been carefully characterized by various methods including single-crystal X-ray diffraction, powder X-ray diffraction (PXRD), infrared (IR) spectroscopy, and thermogravimetric analysis. Two types of four-coordinated Zn2+ centers present a 2D “sql”-type layer through bdtfa4– ligands, and the adjacent layers are connected through hydrogen bonds and π···π stacking interactions to produce a three-dimensional supramolecular framework. Luminescent results reveal that CP 1 can be regarded as a highly sensitive sensor for detecting nitroaromatics based on the fluorescence quenching...
57 citations