Coordination polymer

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

A High-Capacity Negative Electrode for Asymmetric Supercapacitors Based on a PMo 12 Coordination Polymer with Novel Water-Assisted Proton Channels

Abstract: The development of a negative electrode for supercapacitors is a critical challenge for the next-generation of energy-storage devices. Herein, two new electrodes formed by the coordination polymers [Ni(itmb)4 (HPMo12 O40 )]·2H2 O (1) and [Zn(itmb)3 (H2 O)(HPMo12 O40 )]·4H2 O (2) (itmb = 1-(imidazo-1-ly)-4-(1,2,4-triazol-1-ylmethyl)benzene), synthesized by a simple hydrothermal method, are described. Compounds 1 and 2 show high capacitances of 477.9 and 890.2 F g-1 , respectively. An asymmetric supercapacitor device assembled using 2 which has novel water-assisted proton channels as negative electrode and active carbon as positive electrode shows ultrahigh energy density and power density of 23.4 W h kg-1 and 3864.4 W kg-1 , respectively. Moreover, the ability to feed a red light emitting diode (LED) also demonstrates the feasibility for practical use. The results allow a better elucidation of the storage mechanism in polyoxometalate-based coordination polymers and provide a promising direction for exploring novel negative materials for new-generation high-performance supercapacitors.

Metal-directed supramolecular architectures : From mononuclear to 3D frameworks based on in situ tetrazole ligand synthesis

Abstract: This work focuses on the investigation of the influence of metal ions and supramolecular interactions on the self-assembly of in situ generated tetrazolate coordination architectures. A series of new metal−organic complexes, [Zn(pzta)2(H2O)2] (1), [Cu(pzta)2](H2O)3 (2), [Cd(pzta)2]n (3), [Ag(pzta)]n (4), and [Cd2(pzta)(OH)(SO4)]n (5) [pzta = pyrazinyl tetrazolate], have been achieved by the in situ hydrothermal reactions of pyrazinecarbonitrile, sodium azide, and different metal ions. Complexes 1 and 2 have similar mononuclear structures bearing distinct intermolecular hydrogen-bond interactions to form two different 3D supramolecular networks based on 44-subnets. Complex 3 features a 1D crossed-shape chain structure. Complex 4 is a coordination polymer comprised of mildly undulated 2D layers with a (4.82) topological network. Complex 5 is a 3D diamondoid framework constructed by pentanuclear cadmium cluster nodes and pzta linkers. The configurations of complexes 1−5 span from mononuclear (1, 2), to one-d...

Rational design and construction of the first tetrahedral net with photoluminescent Cu4I4 cubane cluster as the tetrahedral node

Abstract: Solvothermal reaction of CuI with flexible 1,3-bis(4-pyridyl)propane generated the first three-dimensional coordination polymer constructed with the rigid tetrahedrally connected Cu4I4 cluster unit. The net is a rare chiral triple-interpenetrated, quartz net with of vertex symbol 64.82. The solid-state luminescence spectrum displays a strong red emission band at room temperature (λmax = 601 nm), characteristic of the Cu4I4 cluster centers.

Self-Assembly of Extended High-Dimensional Architectures from Anderson-type Polyoxometalate Clusters

Abstract: Three unusual compounds based on polyoxometalate building blocks, [(C6H5NO2)2Ln(H2O)4]2[IMo6O24][NO3]·4H2O (Ln = Ce 1 and La 2) and [(H2O)4Ag3][Cr(OH)6Mo6O18]·3H2O 3, have been synthesized and characterized by elemental analysis, IR and X-ray photoelectron spectroscopy, thermogravimetry analysis, and single-crystal X-ray diffraction. Compounds 1 and 2 are isostructural and possess a unique two-dimensional (2D) network, which is composed of rare earth coordination polymer chains joint together by [IMo6O24]5- polyoxoanions, representing the first example of 2D inorganic−organic hybrid compounds based on A-type Anderson polyoxoanions. Compound 3 is constructed from B-type Anderson polyoxoanions [Cr(OH)6Mo6O18]3- and silver (I) ions to yield a three-dimensional (3D) open framework containing “guest” water molecules. To our best knowledge, it is the first time Anderson-type polyoxometalate motifs have been connected with silver ions to construct a 3D covalent framework.

A Novel Coordination Polymer as Positive Electrode Material for Lithium Ion Battery

Abstract: A new coordination polymer based on an aromatic carbonyl ligand is prepared and investigated as a positive active material for lithium ion batteries, namely, [Li2(C6H2O4)] (1). It is synthesized by the dehydration of [Li2(C6H2O4)·2H2O] (2). These compounds are characterized by Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), elemental analysis (EA), single crystal X-ray diffraction methods and powder X-ray diffraction (XRD). As positive material, compound 1 has an initial discharge capacity of 176 mAh·g−1 and a columbic efficiency of 93.18% in the first cycle. It might provide a new method for finding new positive-electrode materials in lithium ion batteries.