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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: Six unprecedented structures of Cu(I) alkynyl complexes and a procedure to measure the cone angles of alkyny ligands based on the crystal structures of these complexes are reported.
Abstract: Copper(I) alkynyl complexes have attracted tremendous attention in structural studies, as luminescent materials, and in catalysis, and homoleptic complexes have been reported to form polymers or large clusters. Herein, six unprecedented structures of Cu(I) alkynyl complexes and a procedure to measure the cone angles of alkynyl ligands based on the crystal structures of these complexes are reported. An increase of the alkynyl cone angle in the complexes leads to a modulation of the structures from polymeric [((PhC≡CC≡C)Cu)2 (NH3 )]∞ , to a large cluster [(TripC≡CC≡C)Cu]20 (MeCN)4 , to a relatively small cluster [(TripC≡C)Cu]8 (Trip=2,4,6-iPr3 -C6 H2 ). The complexes exhibit yellow-to-red phosphorescence at ambient temperature in the solid state and the luminescence behavior of the Cu20 cluster is sensitive to acetonitrile.
56 citations
TL;DR: A facile, green and controllable solid-gas reaction strategy for on-demand modification of porous coordination polymer and shows that the methylene groups can be oxidized by O2/air even at room temperature via formation of the highly active Cu(II)-O2(˙-) intermediate, to form carbonyl groups with enhance rigidity and polarity.
Abstract: Control over the structure and property of synthetic materials is crucial for practical applications. Here we report a facile, green and controllable solid-gas reaction strategy for on-demand modification of porous coordination polymer. Copper(I) and a methylene-bridged bis-triazolate ligand are combined to construct a porous crystal consisting of both enzyme-like O2-activation site and oxidizable organic substrate. Thermogravimetry, single-crystal X-ray diffraction, electron paramagnetic resonance and infrared spectroscopy showed that the methylene groups can be oxidized by O2/air even at room temperature via formation of the highly active Cu(II)-O2(˙-) intermediate, to form carbonyl groups with enhance rigidity and polarity, without destroying the copper(I) triazolate framework. Since the oxidation degree or reaction progress can be easily monitored by the change of sample weight, gas sorption property of the crystal can be continuously and drastically (up to 4 orders of magnitude) tuned to give very high and even invertible selectivity for CO2, CH4 and C2H6.
56 citations
TL;DR: The crystal structure and magnetic properties of the organic radical cation salt, BBDTA, formed a one-dimensional coordination polymer and magnetic measurements indicated the spin-Peierls transition-like behavior at 108 K, which was higher than those typically observed for the other organic spin- Peierls materials.
Abstract: We have studied the crystal structure and magnetic properties of the organic radical cation salt, BBDTA·InCl4. This material formed a one-dimensional coordination polymer. Magnetic measurements indicated the spin-Peierls transition-like behavior at 108 K, which was higher than those typically observed for the other organic spin-Peierls materials. The structural aspects of the lattice distortion from X-ray diffraction measurements at 50 K have been discussed.
56 citations
TL;DR: Luminescence studies show that both H 4L and GdL emit strong fluorescence and phosphorescence at 77 K while only fluorescence at room temperature, and TbL exhibits strong Tb3+ characteristic emission, although the energy difference between the triplet excited state of H4L and the 5D4 energy level of Tb 3+ is very small.
Abstract: Powerful explosive sensors play a key role in public security and environmental protection. Herein, we report a series of isostructural lanthanide coordination polymers [Ln2L1.5(NMP)2]n (LnL: Ln = Eu, Gd, Tb, Dy, Ho, and Er; H4L = [1,1′:4′,1″-terphenyl]-2′,4,4″,5′-tetracarboxylic acid; NMP = N-methyl-2-pyrrolidone) and mixed-Ln LnL (EuxTb1–xL, EuxGd1–xL, TbxGd1–xL, and EuxTb0.02–xGd0.98L). Luminescence studies show that both H4L and GdL emit strong fluorescence and phosphorescence at 77 K while only fluorescence at room temperature, and TbL exhibits strong Tb3+ characteristic emission, although the energy difference between the triplet excited state of H4L (20661 cm–1) and the 5D4 energy level of Tb3+ (20500 cm–1) is very small. By doping Eu3+ and Tb3+ into GdL, we obtained EuxTb0.02–xGd0.98L emitting warm white light. For TbL and Tb0.01Gd0.99L showing dual emission, upon addition of picric acid (PA) into their suspensions in Tris–HCl buffer, Tb3+ emission decreases slowly; however, the ligand-based emiss...
56 citations
TL;DR: In this article, three metal-II-organic frameworks (MOFs) formulated as M2L4·3H2O [M = Co (1), Cu (2), and Zn (3)] were synthesized and characterized by single-crystal X-ray diffraction.
Abstract: Using a rigid ligand, 4-(5-(pyridin-4-yl)-4H-1,2,4-triazol-3-yl) benzoic acid (HL), three metal(II)–organic frameworks (MOFs) formulated as M2L4·3H2O [M = Co (1), Cu (2), and Zn (3)] were synthesized and characterized by single-crystal X-ray diffraction. The three MOFs are isostructural except for different unsaturated coordinated metal(II) ions in the structures, and they display a uninodal two-dimensional layer with 44-sql topology. Among the three complexes, the Co and Cu complexes can act as electrocatalysts for water splitting, and the Co complex shows better electrocatalytic activity. The present work shows that the species of metal(II) ions plays an important role in the electrocatalytic activity for water splitting. The three complexes show different thermal stabilities, UV–vis absorption characteristics, and photoluminescence properties.
56 citations