Tailoring the Coordination Microenvironment of Polymolybdate within a Metal-Organic Coordination System for Enhanced Capacitive Activity.

The design of a low-cost and efficient electrode material is crucial for electrochemical energy storage. Effectual utilization of polymolybdate as an electrode material for a supercapacitor is promising. Meanwhile, the coordination microenvironments of polymolybdate sho potential effects on its performance.

Two {Cu[PMo]}-Based Coordination Polymers Incorporating In Situ Converted Tetrapyridyl Ligands for Trace Analysis of Nitrofuran Antibiotics.

Nitrofurans are important synthetic broad-spectrum antibacterial drugs with the basic structure of 5-nitrofuran. Due to their toxicity, it is essential to develop a sensitive sensor with strong anti-interference capabilities for their detection. In this work, two {PMoO}-based compounds, [H(HPTTP)]{Cu[MoO(OH)(PO)(HPO)(HPO)]}·HO ( = 13 for (), 7 for (); HPTTP = 4,4',4″,4‴-(1-pyrrole-2,3,4,5-tetrayl)tetrapyridine), exhibiting similar coordination but distinct stacking modes.

Improved capacitive performances and electrocatalytic reduction activity by regulating the bonding interaction between Zn-bistriazole-pyrazine/pyridine units and diverse Anderson-type polyoxometalates.

Electrochemical performances can be effectively improved by introducing metal-organic units (MOUs) into polyoxometalates (POMs). However, regulating the bonding strength between POMs and MOUs at the molecular level to improve the electrochemical performance is a challenging task. Three new POM-based metal-organic complexes (MOCs), namely H{Zn(Hpytty)(HO)[CrMo(OH)O]}·2HO (1), H{Zn(Hpyttz)(HO)[CrMo(OH)O]}·8HO (2), and {(μ-OH)Zn(pyttz)(HO)[TeMoO]}·2HO (3) (Hpytty = 3-(pyrazin-2-yl)-5-(1-1,2,4-triazol-3-yl)-1,2,4-triazolyl, Hpyttz = 3-(pyrid-2-yl)-5-(1-1,2,4-triazol-3-yl)-1,2,4-triazolyl), were obtained.

"Tree"-like Multidentate Ligand-Assisted Synthesis of Polymolybdate-Based Architectures with Multinuclear Metal Clusters: Supercapacitor and Electrochemical Sensing Performances.

In this work, aiming for constructing multinuclear metal cluster-modified polymolybdate-based architectures with novel conformation, the "tree"-like multidentate ligand 5-(3-pyridyl)-1-tetrazole) (3-ptzH) is introduced into the polymolybdate reaction system. Three new polymolybdate-based architectures with various multinuclear metal clusters, H[Cu(μ-OH)(3-ptz)(γ-MoO) (HO)]·2HO (), H[Ag(3-ptz)(MoO)] (), and H[Cu(3-ptzH)(3-ptz)(MnMoO)(HO)] () (BOHU = Bohai University), have been prepared via the hydrothermal method and structurally characterized. In , a kind of pentanuclear copper cluster unit: [Cu(μ-OH)(3-ptz)] is formed, which connects to construct a one-dimensional (1D) cluster-based chain.

Two new polyoxometalate-based metal-organic complexes for the detection of trace Cr(VI) and their capacitor performance.

Two new Keggin-type polyoxometalate (POM)-based metal-organic complexes (MOCs) H3[Cu2(4-dpye)2(PMo12O40)] (1) and H[Cu2(4-Hdpye)2(PMo12O40)(H2O)4]·2H2O (2) were constructed with a new N,N'-bis (4-pyrimidinecarboxamido)-1,2-ethane (4-H2dpye) ligand by the hydrothermal/solvothermal method. Complex 1 was a 2D layered structure constructed from 1D metal-organic chains [Cu(4-dpye)]n and Keggin-type [PMo12O40]3- polyoxoanions. Complex 2 displays a 3D supramolecular framework formed by discrete [PMo12O40]3- polyoxoanions and binuclear metal-organic loops [Cu2(4-Hdpye)2].

Immobilization of phosphotungstate through doping in polypyrrole for supercapacitors.

Immobilization of phosphotungstate is achieved through doping in polypyrrole via the electrochemical deposition of polypyrrole (PPy) in the presence of the phosphotungstate anions (PW12) on carbon nanotube film. Electrochemical stability in neutral solution is realized for PW12 in the prepared ECNT-PPy/5PW12, owing to the proton sponge provided by PPy. ECNT-PPy/5PW12 shows a high areal capacitance of 1300.

A series of Anderson-type polyoxometalate-based metal-organic complexes: their pH-dependent electrochemical behaviour, and as electrocatalysts and photocatalysts.

Seven polyoxometalate-based (POM) metal-organic complexes (MOCs) with different pyridyl-amide ligands were hydrothermally synthesized and structurally characterized. In 1, the [CrMo6(OH)5O19](4-) (CrMo6) polyoxoanions bridge the Cu(II) ions to generate a 1D Cu-CrMo6 inorganic double chain, which is further consolidated by the μ2-bridging 2-pdya ligands. Complex 2 exhibits a 2D layer based on [γ-Mo8O26]n(4n-) chains.

Novel Anderson-type [TeMo6O24](6-)-based metal-organic complexes tuned by different species and their coordination modes: assembly, various architectures and properties.

Four novel Anderson-type polyoxometalates (POMs) [TeMo6O24](6-) (TeMo6)-based metal-organic complexes (MOCs), namely, H2[Zn4(3-Hdpyp)2(TeMo6O24)2(H2O)16]·6H2O (1), [Zn3(3-dpyb)2(TeMo6O24)(H2O)12]·8H2O (2), [Cu2(4-Hdpyp)2(TeMo6O24)(H2O)6]·4H2O (3), and [Cu3(3-dpyp)2(TeMo6O24)(H2O)8]·4H2O (4) (3-dpyp = N,N'-bis(3-pyridinecarboxamide)-1,3-propane, 3-dpyb = N,N'-bis(3-pyridinecarboxamide)-1,4-butane, 4-dpyp = N,N'-bis(4-pyridinecarboxamide)-1,3-propane), were hydrothermally synthesized and structurally characterized by single-crystal X-ray diffraction, IR spectra, powder X-ray diffraction (PXRD) and thermogravimetric analyses (TGA). In complex 1, two TeMo6 polyoxoanions bridge Zn(II) ions to generate a discrete tetranuclear zinc complex H2[Zn4(3-Hdpyp)2(TeMo6O24)2(H2O)16]. In 2, the TeMo6 anions connect the metal-organic units [Zn3(3-dpyb)2](6+) to form an Anderson-type TeMo6-based wave-like metal-organic chain.

Assembly and photocatalysis of two novel 3D Anderson-type polyoxometalate-based metal-organic frameworks constructed from isomeric bis(pyridylformyl)piperazine ligands.

Two novel Anderson-type polyoxometalates (POMs)-based metal-organic frameworks (MOFs), namely, H{Cu2(μ2-OH)2L(1)[CrMo6(OH)6O18]}·4H2O (), {Cu2L(2)[CrMo(VI)5Mo(V)(OH)6O18](H2O)4}·4H2O () (L(1) = N,N'-bis(3-pyridinecarboxamide)-piperazine, L(2) = N,N'-bis(4-pyridinecarboxamide)-piperazine), are hydrothermally synthesized and structurally characterized by single-crystal X-ray diffraction, IR spectra, powder X-ray diffraction (PXRD) and thermogravimetric analyses (TGA). In complex , the hexadentate [CrMo6(OH)6O18](3-) polyoxoanion bridges the Cu(II) ions to generate a 2D Cu-POM inorganic layer, which is further extended by the μ2-bridging L(1) ligands (via ligation of pyridyl nitrogen atoms) to form a 3D MOF with a 4,6-connected {4(4)·6(10)·8}{4(4)·6(2)} topology. Complex is also a 3D POM-based MOF exhibiting a {4(2)·8(4)} topology, which is constructed from the quadridentate [CrMo(VI)5Mo(V)(OH)6O18](4-) polyoxoanions and μ4-bridging L(2) ligands (via ligation of pyridyl nitrogen and carbonyl oxygen atoms).