Assembly of 12-tungstosilicic acid and 4-aminobenzo-15-crown-5 ether based on the electrostatic attraction through bridging of oxonium ions on different substrates

Yang, Guocheng; Guo, Hongwei; Wang, Mingkui; Huang, Minghua; Chen, Hongjun; Liu, Baifeng; Dong, Shaojun

doi:10.1016/j.jelechem.2006.09.010

Cited by 14 publications

(3 citation statements)

References 45 publications

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“…The characteristic asymmetric bending vibration of oxonium ions at about 1720 cm −1 was not observed because of the low content comparing with the large molecular weight of the hybrid (ca. 4200 g mol −1 , as follows) or the resistance of bending vibrations in solid state . Combining these results and elemental analysis, an approximate formula for the chemical composition of the hybrid complex is proposed to be (C 18 NEO 12 ) 1.6 H 2.4 (SiW 12 O 40 ).…”

Section: Resultsmentioning

confidence: 99%

Hexagonal Mesostructure and Its Disassembly into Nanofibers of a Diblock Molecule/Polyoxometalate Hybrid

Lin

Wang

2009

Langmuir

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Hexagonally mesostructured polyoxometalate-based hybrid was prepared by a mild-solution method through the self-assembly of an amphiphilic poly(ethylene oxide) octadecyldimethylammonium (C18NEO12) and a polyanionic silicotungstic acid (HSiW). The composition of the hybrid was characterized through 1H NMR, infrared spectroscopy, mass spectroscopy, elemental analysis, and thermogravimetric analysis, indicating an approximate formula (C18NEO12)1.6H2.4(SiW12O40). The structure of the hybrid was investigated by transmission electron microscopy (TEM), scanning electron microscopy, X-ray powder diffraction, and contact angle measurement. The hybrid is a rodlike grain with the hexagonal mesostructure, which consists of one-dimensional column micelles in which alkyl chains of C18NEO12 locate at the center and poly(ethylene oxide) (PEO) part at the outside, with HSiWs anchoring at the interface, but more close to the PEO part. Furthermore, the observation of the formation process of hybrids by TEM shows that ethanol plays an important role in the self-assembly. More importantly, the hexagonal mesostructure can transform into nanofibers comprising nanofibrils in water through the disassembly.

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Section: Resultsmentioning

confidence: 99%

Hexagonal Mesostructure and Its Disassembly into Nanofibers of a Diblock Molecule/Polyoxometalate Hybrid

Lin

Wang

2009

Langmuir

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“…Quantitative interpretation of the impedance graph was performed by employing the appropriate equivalent Randles circuit and extracting the electrical parameters. The equivalent circuit comprises an electrolyte resistance, R s in series with a parallel circuit of double layer capacitance C dl and a charge transfer resistance R ct , along with a diffusional branch, that is, Warburg impedance Z W . − However, in this case, a constant phase element (CPE) was introduced into the equivalent circuit instead of C dl , which defines the nonuniform distribution of the capacitance over the surface due to the amorphous nature of the glassy carbon working electrode. Supporting Information Figure S5A explains the switching behavior of the double layer capacitance.…”

Section: Resultsmentioning

confidence: 99%

Investigations into the Electrochemical, Surface, and Electrocatalytic Properties of the Surface-Immobilized Polyoxometalate, TBA₃K[SiW₁₀O₃₆(PhPO)₂]

Yaqub

Imar

Laffir

et al. 2015

ACS Appl. Mater. Interfaces

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Surface anchoring of an organic functionalized POM, TBA3K[SiW10O36(PhPO)2] was carried out by two methods, the layer-by-layer (LBL) assembly technique by employing a pentaerythritol-based ruthenium(II) metallodendrimer as a cationic moiety and also by entrapping the POM in a conducting polypyrrole film. The redox behavior of the constructed films was studied by using cyclic voltammetry and electrochemical impedance spectroscopy. The surface morphologies of the constructed multilayers were examined by scanning electron microscopy and atomic force microscopy. X-ray photoelectron spectroscopy was conducted to confirm the elements present within the fabricated films. The multilayer assembly was also investigated for its catalytic efficiency towards the reduction of nitrite.

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“…The structural and compositional diversity among this class of compounds have enabled them to be promising candidates for a wide range of applications across materials science, medicine, biotechnology, nanotechnology and catalysis. [1][2][3][4][5][6][7][8][9][10][11][12] The general structure of POMs consists of MO 6 units joined together by edge or corner sharing and connected tetrahedrally to a centrally bonded heteroatom (usually phosphorus or silicon). One of the MO 6 units can be removed from the structure at higher pH and substituted with different metal ions allowing for controllable molecular design.…”

Section: Introductionmentioning

confidence: 99%

Transition metal ion-substituted polyoxometalates entrapped in polypyrrole as an electrochemical sensor for hydrogen peroxide

Anwar

Vagin

Laffir

et al. 2012

Analyst

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A conducting polymer was used for the immobilization of various transition metal ion-substituted Dawson-type polyoxometalates (POMs) onto glassy carbon electrodes. Voltammetric responses of films of different thicknesses were stable within the pH domain 2-7 and reveal redox processes associated with the conducting polymer, the entrapped POMs and incorporated metal ions. The resulting POM doped 10 polypyrrole films were found to be extremely stable towards redox switching between the various redox states associated with the incorporated POM. An amperometric sensor for hydrogen peroxide detection based upon the POM doped polymer films was investigated. The detection limits were 0.3 and 0.6 uM, for the Cu 2+ -and Fe 3+ -substituted POM-doped polypyrrole films respectively, with a linear region from 0.1 up to 2mM H 2 O 2 . Surface characterization of the polymer films was carried out using atomic force 15 microscopy, x-ray photoelectron spectroscopy and scanning electron microscopy. IntroductionPolyoxometalates (POMs) are a widely increasing class of inorganic early transition metal-oxide clusters. The structural and compositional diversity among this class of compounds have 20 enabled them to be promising candidates for a wide range of applications across material science, medicine, biotechnology, nanotechnology and catalysis. [1][2][3][4][5][6][7][8][9][10][11][12] The general structure of POMs consists of MO 6 units joined together by edge or corner sharing and connected tetrahedrally to a centrally bonded heteroatom 25 (usually phosphorus or silicon). One of the MO 6 units can be removed from the structure at higher pH and substituted with different metal ions allowing for controllable molecular design.Various strategies have been used for immobilization of POMs onto different surfaces, safeguarding their inherent properties. 30 These include: sol-gel technique, 13 polyoxometalates. 38,39 Despite the high selectivity and sensitivity of enzyme-modified electrodes, 40, 41 the limitation of usage of these systems is related to the difficulty in obtaining the optimal conditions and the lack of the enzymatic activity over a period of time, 42 POMs inside the polymer matrix were accessible for voltammetric studies in acidic medium. The films exhibited stable redox responses in the pH range of 2-7. Surface characterization was carried out using the AFM, XPS and SEM. Electrocatalytic activity of the films containing iron and copper-20 substituted POMs towards the reduction of hydrogen peroxide was studied by amperometry at physiological conditions (pH 6.5) and compared with the performance of the same POMs in solution 50 and immobilized onto an electrode surface via multilayer assemblies. 19 Conducting polymer-based POM-doped 25 polypyrrole films reveal the best analytical characteristics for hydrogen peroxide reduction in comparison with some other approaches. Experimental 30 MaterialsThe potassium salts of all the substituted Dawson type polyoxometalates investigated were synthesized and characterised by both ele...

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Assembly of 12-tungstosilicic acid and 4-aminobenzo-15-crown-5 ether based on the electrostatic attraction through bridging of oxonium ions on different substrates

Cited by 14 publications

References 45 publications

Hexagonal Mesostructure and Its Disassembly into Nanofibers of a Diblock Molecule/Polyoxometalate Hybrid

Hexagonal Mesostructure and Its Disassembly into Nanofibers of a Diblock Molecule/Polyoxometalate Hybrid

Investigations into the Electrochemical, Surface, and Electrocatalytic Properties of the Surface-Immobilized Polyoxometalate, TBA₃K[SiW₁₀O₃₆(PhPO)₂]

Transition metal ion-substituted polyoxometalates entrapped in polypyrrole as an electrochemical sensor for hydrogen peroxide

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Assembly of 12-tungstosilicic acid and 4-aminobenzo-15-crown-5 ether based on the electrostatic attraction through bridging of oxonium ions on different substrates

Cited by 14 publications

References 45 publications

Hexagonal Mesostructure and Its Disassembly into Nanofibers of a Diblock Molecule/Polyoxometalate Hybrid

Hexagonal Mesostructure and Its Disassembly into Nanofibers of a Diblock Molecule/Polyoxometalate Hybrid

Investigations into the Electrochemical, Surface, and Electrocatalytic Properties of the Surface-Immobilized Polyoxometalate, TBA3K[SiW10O36(PhPO)2]

Transition metal ion-substituted polyoxometalates entrapped in polypyrrole as an electrochemical sensor for hydrogen peroxide

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Investigations into the Electrochemical, Surface, and Electrocatalytic Properties of the Surface-Immobilized Polyoxometalate, TBA₃K[SiW₁₀O₃₆(PhPO)₂]