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Tripathi A, Supriya S. Photochemical and gas adsorption studies of Keggin polyoxometalate functionalized porous melamine terephthaldehyde material. Dalton Trans 2023; 52:13962-13970. [PMID: 37728736 DOI: 10.1039/d3dt02294c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/21/2023]
Abstract
A compound containing a microporous melamine-terephthaldehyde framework is protonated by grinding with acetic acid, resulting in a mesoporous protonated melamine-terephthaldehyde network. The Keggin polyanion [PMo12O40]3- is then immobilized into this protonated melamine-terephthaldehyde network through a solid-state reaction. The polyanion interacts with the protonated microporous organic network through electrostatic interaction. Three different Keggin-melamine-terephthaldehyde materials were synthesized by varying the Keggin anion loading of 10 wt%, 15 wt% and 20 wt%. The Keggin-melamine-terephthaldehyde materials exhibit photochromism on irradiation with sunlight. The photochromism of the POM-organic hybrid material is due to reduction of the Keggin anion. The resulting blue reduced Keggin-melamine-terephthaldehyde materials are oxidized back by treatment with hydrogen peroxide. The N2, CO2 and H2 adsorption properties of all the synthesized materials, including protonated melamine-terephthaldehyde materials, were studied. The materials were characterized by IR, PXRD, DRS, TGA, EPR spectroscopy, and FESEM electron microscopy. The elemental composition was analysed with a CHN analyser and ICP-OES analysis.
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Affiliation(s)
- Anjali Tripathi
- School of Physical Sciences, Jawaharlal Nehru University, New Delhi-110067, India.
| | - Sabbani Supriya
- School of Physical Sciences, Jawaharlal Nehru University, New Delhi-110067, India.
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2
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Primera-Pedrozo OM, Tan S, Zhang D, O'Callahan BT, Cao W, Baxter ET, Wang XB, El-Khoury PZ, Prabhakaran V, Glezakou VA, Johnson GE. Influence of surface and intermolecular interactions on the properties of supported polyoxometalates. NANOSCALE 2023; 15:5786-5797. [PMID: 36857667 DOI: 10.1039/d2nr06148a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Polyoxometalates (POMs) with localized radical or open-shell metal sites have the potential to be used as transformative electronic spin based molecular qubits (MQs) for quantum computing (QC). For practical applications, MQs have to be immobilized in electronically or optically addressable arrays which introduces interactions with supports as well as neighboring POMs. Herein, we synthesized Keggin POMs with both tungsten (W) and vanadium (V) addenda atoms. Ion soft landing, a highly-controlled surface modification technique, was used to deliver mass-selected V-doped POMs to different self-assembled monolayer surfaces on gold (SAMs) without the solvent, counterions, and contaminants that normally accompany deposition from solution. Alkylthiol, perfluorinated, and carboxylic-acid terminated monolayers were employed as representative model supports on which different POM-surface and POM-POM interactions were characterized. We obtained insights into the vibrational properties of supported V-doped POMs and how they are perturbed by interactions with specific surface functional groups using infrared reflection absorption and scattering-type scanning near-field optical microscopy, as well as tip enhanced Raman spectroscopy. Different functional groups on SAMs and nanoscale heterogeneity are both shown to modulate the observed spectroscopic signatures. Spectral shifts are also found to be dependent on POM-POM interactions. The electronic structure of the V-doped POMs was determined in the gas phase using negative ion photoelectron spectroscopy and on surfaces with scanning Kelvin probe microscopy. The chemical functionality and charge transfer properties of the SAMs are demonstrated to exert an influence on the charge state and electronic configuration of supported V-doped POMs. The geometric and electronic structure of the POMs were also calculated using density functional theory. Our joint experimental and theoretical findings provide insight into how V substitution as well as POM-surface and POM-POM interactions influence the vibrational properties of POMs.
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Affiliation(s)
- Oliva M Primera-Pedrozo
- Pacific Northwest National Laboratory, Physical Sciences Division, P.O. Box 999, MSIN J7-10, Richland, Washington 99352, USA.
| | - Shuai Tan
- Pacific Northwest National Laboratory, Physical Sciences Division, P.O. Box 999, MSIN J7-10, Richland, Washington 99352, USA.
| | - Difan Zhang
- Pacific Northwest National Laboratory, Physical Sciences Division, P.O. Box 999, MSIN J7-10, Richland, Washington 99352, USA.
| | - Brian T O'Callahan
- Pacific Northwest National Laboratory, Earth and Biological Sciences Division, P.O. Box 999, MSIN K8-88, Richland, Washington 99352, USA
| | - Wenjin Cao
- Pacific Northwest National Laboratory, Physical Sciences Division, P.O. Box 999, MSIN J7-10, Richland, Washington 99352, USA.
| | - Eric T Baxter
- Pacific Northwest National Laboratory, Physical Sciences Division, P.O. Box 999, MSIN J7-10, Richland, Washington 99352, USA.
| | - Xue-Bin Wang
- Pacific Northwest National Laboratory, Physical Sciences Division, P.O. Box 999, MSIN J7-10, Richland, Washington 99352, USA.
| | - Patrick Z El-Khoury
- Pacific Northwest National Laboratory, Physical Sciences Division, P.O. Box 999, MSIN J7-10, Richland, Washington 99352, USA.
| | - Venkateshkumar Prabhakaran
- Pacific Northwest National Laboratory, Physical Sciences Division, P.O. Box 999, MSIN J7-10, Richland, Washington 99352, USA.
| | | | - Grant E Johnson
- Pacific Northwest National Laboratory, Physical Sciences Division, P.O. Box 999, MSIN J7-10, Richland, Washington 99352, USA.
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Granadeiro CM, Julião D, Ribeiro SO, Cunha-Silva L, Balula SS. Recent advances in lanthanide-coordinated polyoxometalates: from structural overview to functional materials. Coord Chem Rev 2023. [DOI: 10.1016/j.ccr.2022.214914] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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4
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Electrochemical sensor based on the polyoxometalate nanocluster [(NH4)12[Mo36(NO)4O108(H2O)16]·33H2O and molybdenum disulfide nanocomposite materials for simultaneous detection of dihydroxybenzene isomers. Microchem J 2022. [DOI: 10.1016/j.microc.2022.107232] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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5
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Saha S, Zakharov LN, Captain B, Keszler DA. Synthesis and Structural Analysis of Novel Phosphonium Hexatungstate Complexes. J CLUST SCI 2021. [DOI: 10.1007/s10876-020-01835-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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6
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Kibler AJ, Souza VS, Fernandes JA, Lewis W, Argent SP, Dupont J, Newton GN. A Cooperative Photoactive Class-I Hybrid Polyoxometalate With Benzothiadiazole-Imidazolium Cations. Front Chem 2021; 8:612535. [PMID: 33520936 PMCID: PMC7841050 DOI: 10.3389/fchem.2020.612535] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Accepted: 12/09/2020] [Indexed: 11/13/2022] Open
Abstract
An organic–inorganic hybrid species based on the Wells–Dawson polyoxotungstate [P2W18O62]6− and novel fluorescent benzothiadiazole–imidazolium cations, [BTD-4,7-ImH]2+, has been synthesized. X-ray crystallographic analysis shows that the inorganic and organic components form a hydrogen-bonded superstructure and that the cations are revealed to be non-equivalent with varying degrees of rotation between the BTD and imidazolium rings due to competition between weak intra- and intermolecular interactions. The UV–vis diffuse reflectance spectra indicate that the hybrid has a band gap of 3.13 eV, while the solid-state fluorescence properties of the cation are quenched in the hybrid material, suggesting the existence of electron transfer between the inorganic and organic components. The highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energies of the polyoxometalate (POM) and BTD-4,7-ImH precursors, estimated through UV–vis absorption spectroscopy and cyclic voltammetry, indicate that electron transfer from the BTD cations to the POM may occur in the excited state.
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Affiliation(s)
- Alexander J Kibler
- GlaxoSmithKline Carbon Neutral Laboratories for Sustainable Chemistry, Department of Chemistry, University of Nottingham, Nottingham, United Kingdom
| | - Virginia S Souza
- Laboratory of Molecular Catalysis, Institute of Chemistry, Universidade Federal do Rio Grande Do Sul, Porto Alegre, Brazil
| | - Jesum Alves Fernandes
- Department of Chemistry, School of Chemistry, University of Nottingham, Nottingham, United Kingdom
| | - William Lewis
- Department of Chemistry, School of Chemistry, University of Nottingham, Nottingham, United Kingdom
| | - Stephen P Argent
- Department of Chemistry, School of Chemistry, University of Nottingham, Nottingham, United Kingdom
| | - Jairton Dupont
- Laboratory of Molecular Catalysis, Institute of Chemistry, Universidade Federal do Rio Grande Do Sul, Porto Alegre, Brazil
| | - Graham N Newton
- GlaxoSmithKline Carbon Neutral Laboratories for Sustainable Chemistry, Department of Chemistry, University of Nottingham, Nottingham, United Kingdom
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7
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Tandekar K, Mishra NK, Supriya S. Solvent mediated reversible solid state photochromism of {Mo 72Fe 30} Keplerate. Dalton Trans 2021; 50:6146-6151. [PMID: 33881432 DOI: 10.1039/d1dt00628b] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
When the yellow rhombohedral crystals of Keplerate [Mo72Fe30O252(CH3COO)12{Mo2O7(H2O)}2{H2Mo2O8(H2O)}(H2O)91]·150H2O (1), on wetting with N,N-dimethylformamide (DMF), are irradiated with sunlight, a remarkable reversible solid state photochromic behaviour is achieved with the formation of green coloured crystals (1red). The reduction of the {MoVI} centres to {MoV} is responsible for the observed colour change from yellow to dark green. Importantly, compound 1 can be activated towards photochromism only in the presence of the DMF solvent. The photochromic phenomenon displayed by Keplerate compound 1 is a classic example of sunlight activated solvent driven photoactivity.
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Affiliation(s)
- Kesar Tandekar
- School of Physical Sciences, Jawaharlal Nehru University, New Delhi-110067, India.
| | - Neeraj Kumar Mishra
- School of Physical Sciences, Jawaharlal Nehru University, New Delhi-110067, India.
| | - Sabbani Supriya
- School of Physical Sciences, Jawaharlal Nehru University, New Delhi-110067, India.
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8
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Protonation-Induced Enhanced Optical-Light Photochromic Properties of an Inorganic-Organic Phosphomolybdic Acid/Polyaniline Hybrid Thin Film. NANOMATERIALS 2020; 10:nano10091839. [PMID: 32942574 PMCID: PMC7559633 DOI: 10.3390/nano10091839] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Revised: 09/07/2020] [Accepted: 09/12/2020] [Indexed: 11/16/2022]
Abstract
A phosphomolybdic acid/polyaniline (PMoA/PANI) optical-light photochromic inorganic/organic hybrid thin film was successfully synthesized by protonation between the the multiprotonic acid phosphomolybdic acid (H3PO4·12MoO3) and the conductive polymer polyaniline. The stable Keggin-type structure of PMoA was maintained throughout the process. Protonation and proton transfer successfully transformed the quinone structure of eigenstate PANI into the benzene structure of single-polarized PANI in the PMoA/PANI hybridized thin film, and proton transfer transformed the benzene structure of single-polarized PANI back to the quinone structure of eigenstate PANI in the PMoA/PANI hybrid thin film, as verified by Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The average distribution of PMoA/PANI was observed by atom force microscopy (AFM). Interestingly, protonation of PMoA caused PANI to trigger transformation of the quinone structure into the single-polarized benzene structure, which enhanced the electron delocalization ability and vastly enhanced the maximum light absorption of the PMoA/PANI hybrid thin film as confirmed by density functional theory (DFT), electrochemistry, and ultraviolet-visible spectroscopy (UV-Vis) studies. Under optical-light illumination, the pale-yellow PMoA/PANI hybrid thin film gradually turned deep blue, thus demonstrating a photochromic response, and reversible photochromism was also observed in the presence of hydrogen peroxide (H2O2) or oxygen (O2). After 40 min of optical-light illumination, 36% of the Mo5+ species in PMoA was photoreduced via a protonation-induced proton transfer mechanism, and this proton transfer resulted in a structural change of PANI, as observed by XPS, generating a dominant structure with high maximum light absorption of 3.46, when compared with the literature reports.
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Hota I, Debnath AK, Muthe KP, Varadwaj KSK, Parhi P. Towards Synergy of rGO and Ni doped CeO
2
in their copmposite as Efficient Catalyst for Oxygen Reduction Reaction. ChemistrySelect 2020. [DOI: 10.1002/slct.202001177] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Ipsha Hota
- Department of ChemistryRavenshaw University Cuttack Odisha 753003 India
| | - A. K. Debnath
- Technical Physics DivisionBhabha Atomic Research Center Mumbai 400085 India
| | - K. P. Muthe
- Technical Physics DivisionBhabha Atomic Research Center Mumbai 400085 India
| | - K. S. K. Varadwaj
- Department of ChemistryRavenshaw University Cuttack Odisha 753003 India
| | - P. Parhi
- Department of ChemistryRavenshaw University Cuttack Odisha 753003 India
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10
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Gao W, Zhou Q, Fu Z, Yu T, Bi L. Research on electro-triggered luminescent switching behaviors of film materials containing green luminescence Tb-polyoxometalate. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2019.05.144] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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11
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Zhao S, Caruso F, Dähne L, Decher G, De Geest BG, Fan J, Feliu N, Gogotsi Y, Hammond PT, Hersam MC, Khademhosseini A, Kotov N, Leporatti S, Li Y, Lisdat F, Liz-Marzán LM, Moya S, Mulvaney P, Rogach AL, Roy S, Shchukin DG, Skirtach AG, Stevens MM, Sukhorukov GB, Weiss PS, Yue Z, Zhu D, Parak WJ. The Future of Layer-by-Layer Assembly: A Tribute to ACS Nano Associate Editor Helmuth Möhwald. ACS NANO 2019; 13:6151-6169. [PMID: 31124656 DOI: 10.1021/acsnano.9b03326] [Citation(s) in RCA: 133] [Impact Index Per Article: 26.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Layer-by-layer (LbL) assembly is a widely used tool for engineering materials and coatings. In this Perspective, dedicated to the memory of ACS Nano associate editor Prof. Dr. Helmuth Möhwald, we discuss the developments and applications that are to come in LbL assembly, focusing on coatings, bulk materials, membranes, nanocomposites, and delivery vehicles.
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Affiliation(s)
- Shuang Zhao
- Fachbereich Physik, CHyN , Universität Hamburg , 22607 Hamburg , Germany
| | - Frank Caruso
- ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, and the Department of Chemical Engineering , The University of Melbourne , Parkville , Victoria 3010 , Australia
| | - Lars Dähne
- Surflay Nanotec GmbH , 12489 Berlin , Germany
| | - Gero Decher
- CNRS Institut Charles Sadron, Faculté de Chimie , Université de Strasbourg, Int. Center for Frontier Research in Chemistry , Strasbourg F-67034 , France
- Int. Center for Materials Nanoarchitectonics , Ibaraki 305-0044 , Japan
| | - Bruno G De Geest
- Department of Pharmaceutics , Ghent University , 9000 Ghent , Belgium
| | - Jinchen Fan
- Department of Chemical Engineering and Biointerfaces Institute , University of Michigan , Ann Arbor , Michigan 48105 , United States
| | - Neus Feliu
- Fachbereich Physik, CHyN , Universität Hamburg , 22607 Hamburg , Germany
| | - Yury Gogotsi
- Department of Materials Science and Engineering and A. J. Drexel Nanomaterials Institute , Drexel University , Philadelphia , Pennsylvania 19104 , United States
| | - Paula T Hammond
- Department of Chemical Engineering , Massachusetts Institute of Technology , Cambridge , Massachusetts 02459 , United States
| | - Mark C Hersam
- Department of Materials Science and Engineering , Northwestern University , Evanston , Illinois 60208-3108 , United States
| | - Ali Khademhosseini
- Department of Bioengineering, Center for Minimally Invasive Therapeutics (C-MIT), California NanoSystems Institute (CNSI) , University of California, Los Angeles , Los Angeles , California 90095 , United States
| | - Nicholas Kotov
- Department of Chemical Engineering and Biointerfaces Institute , University of Michigan , Ann Arbor , Michigan 48105 , United States
- Michigan Institute for Translational Nanotechnology , Ypsilanti , Michigan 48198 , United States
| | - Stefano Leporatti
- CNR Nanotec-Istituto di Nanotecnologia , Italian National Research Council , Lecce 73100 , Italy
| | - Yan Li
- College of Chemistry and Molecular Engineering , Peking University , Beijing 100871 , China
| | - Fred Lisdat
- Biosystems Technology, Institute for Applied Life Sciences , Technical University , D-15745 Wildau , Germany
| | - Luis M Liz-Marzán
- CIC biomaGUNE , San Sebastian 20009 , Spain
- Ikerbasque, Basque Foundation for Science , Bilbao 48013 , Spain
| | | | - Paul Mulvaney
- ARC Centre of Excellence in Exciton Science, School of Chemistry , University of Melbourne , Parkville , Victoria 3010 , Australia
| | - Andrey L Rogach
- Department of Materials Science and Engineering, and Centre for Functional Photonics (CFP) , City University of Hong Kong , Kowloon Tong , Hong Kong SAR
| | - Sathi Roy
- Fachbereich Physik, CHyN , Universität Hamburg , 22607 Hamburg , Germany
| | - Dmitry G Shchukin
- Stephenson Institute for Renewable Energy, Department of Chemistry , University of Liverpool , Liverpool L69 7ZF , United Kingdom
| | - Andre G Skirtach
- Nano-BioTechnology group, Department of Biotechnology, Faculty of Bioscience Engineering , Ghent University , 9000 Ghent , Belgium
| | - Molly M Stevens
- Department of Materials, Department of Bioengineering and Institute for Biomedical Engineering , Imperial College London , London SW7 2AZ , United Kingdom
| | - Gleb B Sukhorukov
- School of Engineering and Materials Science , Queen Mary University of London , London E1 4NS , United Kingdom
| | - Paul S Weiss
- Department of Bioengineering, Center for Minimally Invasive Therapeutics (C-MIT), California NanoSystems Institute (CNSI) , University of California, Los Angeles , Los Angeles , California 90095 , United States
- Department of Chemistry and Biochemistry and Department of Materials Science and Engineering , University of California, Los Angeles , Los Angeles , California 90095 , United States
| | - Zhao Yue
- Department of Microelectronics , Nankai University , Tianjin 300350 , China
| | - Dingcheng Zhu
- Fachbereich Physik, CHyN , Universität Hamburg , 22607 Hamburg , Germany
| | - Wolfgang J Parak
- Fachbereich Physik, CHyN , Universität Hamburg , 22607 Hamburg , Germany
- CIC biomaGUNE , San Sebastian 20009 , Spain
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12
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Turo MJ, Chen L, Moore CE, Schimpf AM. Co2+-Linked [NaP5W30O110]14−: A Redox-Active Metal Oxide Framework with High Electron Density. J Am Chem Soc 2019; 141:4553-4557. [DOI: 10.1021/jacs.9b00866] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Michael J. Turo
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, United States
| | - Linfeng Chen
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, United States
| | - Curtis E. Moore
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, United States
| | - Alina M. Schimpf
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, United States
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Dalla Francesca K, Lenfant S, Laurans M, Volatron F, Izzet G, Humblot V, Methivier C, Guerin D, Proust A, Vuillaume D. Charge transport through redox active [H 7P 8W 48O 184] 33- polyoxometalates self-assembled onto gold surfaces and gold nanodots. NANOSCALE 2019; 11:1863-1878. [PMID: 30637426 DOI: 10.1039/c8nr09377f] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Polyoxometalates (POMs) are redox-active molecular oxides, which attract growing interest for their integration into nano-devices, such as high-density data storage non-volatile memories. In this work, we investigated the electrostatic deposition of the negatively charged [H7P8W48O184]33- POM onto positively charged 8-amino-1-octanethiol self-assembled monolayers (SAMs) preformed onto gold substrates or onto an array of gold nanodots. The ring-shaped [H7P8W48O184]33- POM was selected as an example of large POMs with high charge storage capacity. To avoid the formation of POM aggregates onto the substrates, which would introduce variability in the local electrical properties, special attention has to be paid to the preformed SAM seeding layer, which should itself be deprived of aggregates. Where necessary, rinsing steps were found to be crucial to eliminate these aggregates and to provide uniformly covered substrates for subsequent POM deposition and electrical characterizations. This especially holds for commercially available gold/glass substrates while these rinsing steps were not essential in the case of template stripped gold of very low roughness. Charge transport through the related molecular junctions and nanodot molecule junctions (NMJs) has been probed by conducting-AFM. We analyzed the current-voltage curves with different models: electron tunneling though the SAMs (Simmons model), transition voltage spectroscopy (TVS) method or molecular single energy level mediated transport (Landauer equation) and we discussed the energetics of the molecular junctions. We concluded to an energy level alignment of the alkyl spacer and POM lowest occupied molecular orbitals (LUMOs), probably due to dipolar effects.
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Affiliation(s)
- K Dalla Francesca
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire, IPCM, 4 Place Jussieu, F-75005 Paris, France.
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14
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Laurans M, Dalla Francesca K, Volatron F, Izzet G, Guerin D, Vuillaume D, Lenfant S, Proust A. Molecular signature of polyoxometalates in electron transport of silicon-based molecular junctions. NANOSCALE 2018; 10:17156-17165. [PMID: 30187072 DOI: 10.1039/c8nr04946g] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Polyoxometalates (POMs) are unconventional electro-active molecules with a great potential for applications in molecular memories, providing efficient processing steps onto electrodes are available. The synthesis of the organic-inorganic polyoxometalate hybrids [PM11O39{Sn(C6H4)C[triple bond, length as m-dash]C(C6H4)N2}]3- (M = Mo, W) endowed with a remote diazonium function is reported together with their covalent immobilization onto hydrogenated n-Si(100) substrates. Electron transport measurements through the resulting densely-packed monolayers contacted with a mercury drop as a top electrode confirms their homogeneity. Adjustment of the current-voltage curves with the Simmon's equation gives a mean tunnel energy barrier ΦPOM of 1.8 eV and 1.6 eV, for the Silicon-Molecules-Metal (SMM) junctions based on the polyoxotungstates (M = W) and polyoxomolybdates (M = Mo), respectively. This follows the trend observed in the electrochemical properties of POMs in solution, the polyoxomolybdates being easier to reduce than the polyoxotungstates, in agreement with lowest unoccupied molecular orbitals (LUMOs) of lower energy. The molecular signature of the POMs is thus clearly identifiable in the solid-state electrical properties and the unmatched diversity of POM molecular and electronic structures should offer a great modularity.
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Affiliation(s)
- Maxime Laurans
- Sorbonne Université, CNRS, Institut Parisien de Chimie Moléculaire, IPCM, 4 Place Jussieu, F-75005 Paris, France.
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15
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Ball V, Mougharbel AS, Kortz U. Uniform trend in layer-by-layer deposition of heteropolytungstates. J Colloid Interface Sci 2018; 533:771-778. [PMID: 30199833 DOI: 10.1016/j.jcis.2018.08.085] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2018] [Revised: 08/24/2018] [Accepted: 08/24/2018] [Indexed: 11/28/2022]
Abstract
HYPOTHESIS The layer-by-layer deposition of films including polyoxometalates (POMs) results in a very interesting range of applications in various fields such as electrochemical devices and as photochromic coatings. However, the fundamental knowledge of the parameters responsible for tuning the properties of the film (i.e. relation between the structure and composition of the POM and the properties of the final film) is still lacking. EXPERIMENTS The current work establishes the relationship between the film thickness, the quantity of POM incorporated in each layer and the electrochemical response of the (PAH-POM)x coatings, where PAH is poly(allylamine hydrochloride). FINDINGS The results presented in this work show that the film thickness, composition and electrochemical activity scale proportionally with the number of W atoms in a series of heteropolytungstates ranging from 5 to 48 (P2W5, PW12, P2V3W15, P2W18, P5W30, P8W48). The obtained results allow us to establish a method to predict the behavior as well as the properties of the film based on the nature of the POM used.
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Affiliation(s)
- Vincent Ball
- Université de Strasbourg, Faculté de Chirurgie Dentaire, 8 Rue Sainte Elisabeth, 67000 Strasbourg, France; Institut National de la Santé et de la Recherche Médicale, Unité Mixte de Recherche 1121, 11 Rue Humann, 67085 Strasbourg Cedex, France.
| | - Ali S Mougharbel
- Jacobs University, Department of Life Sciences and Chemistry, Campus Ring 1, 28759 Bremen, Germany.
| | - Ulrich Kortz
- Jacobs University, Department of Life Sciences and Chemistry, Campus Ring 1, 28759 Bremen, Germany.
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16
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Synthesis, characterization and catalytic oxidation of organosilanes with a novel multilayer polyoxomolybdate containing mixed-valence antimony. MOLECULAR CATALYSIS 2018. [DOI: 10.1016/j.mcat.2018.04.013] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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17
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López X. Effect of protonation, composition and isomerism on the redox properties and electron (de)localization of classical polyoxometalates. PHYSICAL SCIENCES REVIEWS 2017. [DOI: 10.1515/psr-2017-0137] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
This publication reviews some relevant features related with the redox activity of two inorganic compounds: [XM12O40]q- (Keggin structure) and [X2M18O62]q- (Wells-Dawson structure). These are two well-known specimens of the vast Polyoxometalate (POM) family, which has been the subject of extensive experimental and theoretical research owing to their unmatched properties. In particular, their redox activity focus a great deal of attention from scientists due to their prospective related applications. POMs are habitually seen as ‘electron sponges’ since many of them accept several electrons without losing their chemical identity. This makes them excellent models to study mechanisms of electrochemical nature. Their redox properties depend on: (i) the type and number of transition metal atoms in the structure, (ii) the basicity of the first reduced species and, occasionally, of the fully oxidized species; (iii) the size of the molecule, (iv) the overall negative charge of the POM, and (v) the size of the central heteroatom. In the last years, important collaboration between the experimental and theoretical areas has been usual on the development of POM science. In the present chapter three of these synergies are highlighted: the influence of the internal heteroatom upon the redox potentials of Keggin anions; the dependence of the redox waves of Fe-substituted Wells-Dawson compounds with pH; and the role of electron delocalization and pairing in mixed-metal Mo/W Wells-Dawson compounds in their ability to accept electrons. In these three cases, a complete understanding of the problem would not have been possible without the mutual benefit of experimental and computational data.
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Li B, Li W, Li H, Wu L. Ionic Complexes of Metal Oxide Clusters for Versatile Self-Assemblies. Acc Chem Res 2017; 50:1391-1399. [PMID: 28508633 DOI: 10.1021/acs.accounts.7b00055] [Citation(s) in RCA: 108] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
The combination of rational design of building components and suitable utilization of driving force affords spontaneous molecular assemblies with well-defined nanostructure and morphology over multiple length scales. The serious challenges in constructing assemblies with structural advantages for the realization of functions programmed into the building components usually lie ahead since the process that occurs does not always follow the expected roadmap in the absence of external intervention. Thus, prefabricated intermediates that help in governing the target self-assemblies are developed into a type of unique building blocks. Metal oxide cluster polyanions are considered as a type of molecular nanoclusters with size scale and structural morphology similar to those of many known inorganic particles and clusters but possess distinctive characteristics. Following the understanding of these clusters in self-assembly and the rationalization of their most efficient design strategy and approach, the obtained fundamental principles can also be applied in common nanoparticle- and cluster-based systems. On the other hand, the deliberate synergy offered by organic countercations that support the self-assembly of these clusters greatly expands the opportunity for the functionalization of complex building units via control of multiple interactions. The ionic combination of the inorganic clusters with hydrophilicity and the cationic organic component with hydrophobicity leads to discrete properties of the complexes. Significantly, the core-shell structure with rigid-flexible features and amphiphilicity will pave the way for hierarchical self-assemblies of the obtained complexes, while the intrinsic characteristics of the metal oxide clusters can be modulated through external physicochemical stimuli. Within this context, over the past decade we have extensively explored the ionic combination of inorganic polyanionic clusters with cationic organic amphiphiles and devoted our efforts to establishing the general rules and structure-property relationships of the formed complexes for constructing self-assemblies at the interface, in solution, and in solid matrixes. Specific interest has been focused on the functional synergy deriving from the incompatible components in highly organized self-assemblies. In this Account, we describe the recent progress on the ionic complexation of polyoxometalate clusters with cationic amphiphiles and the construction of diverse self-assembled nanostructures. First, the fundamental structural characteristics and molecular geometries of the prepared complexes are analyzed. The construction principle and diversity of the self-assembly based on the complexes and the smart stimuli response are then discussed, subject to the adjustment of various non-covalent interactions occurring in the assemblies. Subsequently, we enumerate the functional applications of the ionic complexes assembling into organic, inorganic, and even biological matrixes. The inspiration from the construction of ionic complexation and self-assembly in this Account provides vivid profiles for the design of hybrid materials involving nanoclusters and/or nanoparticles with rich potentials in addition to polyoxometalate chemistry.
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Affiliation(s)
- Bao Li
- State Key Laboratory of Supramolecular
Structure and Materials, College of Chemistry and Institute of Theoretical
Chemistry, Jilin University, Changchun 130012, P. R. China
| | - Wen Li
- State Key Laboratory of Supramolecular
Structure and Materials, College of Chemistry and Institute of Theoretical
Chemistry, Jilin University, Changchun 130012, P. R. China
| | - Haolong Li
- State Key Laboratory of Supramolecular
Structure and Materials, College of Chemistry and Institute of Theoretical
Chemistry, Jilin University, Changchun 130012, P. R. China
| | - Lixin Wu
- State Key Laboratory of Supramolecular
Structure and Materials, College of Chemistry and Institute of Theoretical
Chemistry, Jilin University, Changchun 130012, P. R. China
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Zhang J, Shi N, Zhang J, Guan Y, Qiao W, Wan X. Light Triggered Co-Assembly of Photocleavable Copolymers and Polyoxometalates with Enhanced Photoluminescence. Macromol Rapid Commun 2016; 38. [DOI: 10.1002/marc.201600550] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2016] [Revised: 10/26/2016] [Indexed: 01/01/2023]
Affiliation(s)
- Jinlong Zhang
- State Key Laboratory of Fine Chemicals; School of Chemical Engineering; Dalian University of Technology; Dalian 116024 China
- Beijing National Laboratory for Molecular Sciences; Key Laboratory of Polymer Chemistry and Physics of Ministry of Education; College of Chemistry and Molecular Engineering; Peking University; Beijing 100871 China
| | - Nan Shi
- Beijing National Laboratory for Molecular Sciences; Key Laboratory of Polymer Chemistry and Physics of Ministry of Education; College of Chemistry and Molecular Engineering; Peking University; Beijing 100871 China
| | - Jie Zhang
- Beijing National Laboratory for Molecular Sciences; Key Laboratory of Polymer Chemistry and Physics of Ministry of Education; College of Chemistry and Molecular Engineering; Peking University; Beijing 100871 China
| | - Yan Guan
- Beijing National Laboratory for Molecular Sciences; Key Laboratory of Polymer Chemistry and Physics of Ministry of Education; College of Chemistry and Molecular Engineering; Peking University; Beijing 100871 China
| | - Weihong Qiao
- State Key Laboratory of Fine Chemicals; School of Chemical Engineering; Dalian University of Technology; Dalian 116024 China
| | - Xinhua Wan
- Beijing National Laboratory for Molecular Sciences; Key Laboratory of Polymer Chemistry and Physics of Ministry of Education; College of Chemistry and Molecular Engineering; Peking University; Beijing 100871 China
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20
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Composite films of poly(allylamine)-capped polydopamine nanoparticles and P8W48 polyoxometalates with electroactive properties. J Colloid Interface Sci 2016; 481:125-30. [DOI: 10.1016/j.jcis.2016.07.055] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2016] [Revised: 07/20/2016] [Accepted: 07/21/2016] [Indexed: 11/20/2022]
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21
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Shinde S, Sami A, Lee JH. Lanthanides-based graphene catalysts for high performance hydrogen evolution and oxygen reduction. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.08.050] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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22
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Izzet G, Volatron F, Proust A. Tailor-made Covalent Organic-Inorganic Polyoxometalate Hybrids: Versatile Platforms for the Elaboration of Functional Molecular Architectures. CHEM REC 2016; 17:250-266. [PMID: 27546462 DOI: 10.1002/tcr.201600092] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2016] [Indexed: 11/08/2022]
Abstract
Post-functionalization of organically modified polyoxometalates (POMs) is a powerful synthetic tool to devise functional building blocks for the rational elaboration of POM-based molecular materials. In this personal account we focus on iodoaryl-terminated POM platforms, describe reliable routes to the synthesis of covalent organic-inorganic POM-based hybrids and their integration into advanced molecular architectures or multi-scale assemblies as well as their immobilization onto surfaces. Valorisation of the remarkable redox properties of POMs in the fields of artificial synthesis and molecular electronic is especially considered.
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Affiliation(s)
- Guillaume Izzet
- Institut Parisien de Chimie Moléculaire UMR CNRS 8232, Sorbonne Universités, UPMC-Paris06, 4 Place Jussieu, F-75005, Paris, France
| | - Florence Volatron
- Institut Parisien de Chimie Moléculaire UMR CNRS 8232, Sorbonne Universités, UPMC-Paris06, 4 Place Jussieu, F-75005, Paris, France
| | - Anna Proust
- Institut Parisien de Chimie Moléculaire UMR CNRS 8232, Sorbonne Universités, UPMC-Paris06, 4 Place Jussieu, F-75005, Paris, France
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23
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Li J, Xu J, Li X, Gao W, Wang L, Wu L, Lee M, Li W. Heteropoly acids triggered self-assembly of cationic peptides into photo- and electro-chromic gels. SOFT MATTER 2016; 12:5572-5580. [PMID: 27240759 DOI: 10.1039/c6sm00752j] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
A series of cationic peptides with alternating lysines and hydrophobic residues were designed and synthesized. These kinds of short peptides with protonated lysines can complex with anionic heteropoly acids (HPAs) to form a stable gel in water/ethanol mixed solution. Circular dichroism spectroscopy showed that the short peptides adopted a mixed conformation (β-sheet and random-coil) within the gel matrix. Scanning and transmission electron microscopy revealed that the heteropoly acids, acting as nanosized cross-linkers, first initiated the self-assembly of the cationic peptides into spherical nanostructures. Then these nanospheres accumulated with each other through hydrogen bonds and hydrophobic interactions to form large sheet-like assemblies, which further interconnected with each other forming continuous 3D network structures. Fourier-transform infrared spectroscopy showed that the structural integrity of the HPAs was maintained during the gelation process. The resultant hybrid gels showed reversible photo- and elecrtro-chromic properties. X-ray photoelectron spectroscopy revealed that the hybrid gels, capable of persistent and reversible changes of their colour, are attributed to the intervalence charge-transfer transition of the HPAs. Reversible information writing and erasing were demonstrated through a repeated photo-lithograph or electric stimuli without significant loss of the gel performance.
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Affiliation(s)
- Jingfang Li
- State key laboratory of supramolecular structure and materials, Institute of theoretical chemistry, Jilin University, Qianjin Avenue 2699, Changchun 130012, China.
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24
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AlDamen MA, Atta SB, Haddad SF. Inorganic architecture based on a {[Ca(H2O)]6[P4W6O34]2}12– building block: Countercation effect on the lattice symmetry. J STRUCT CHEM+ 2016. [DOI: 10.1134/s0022476616040132] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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25
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Gao W, Yu T, Du Y, Wang R, Wu L, Bi L. First Orange Fluorescence Composite Film Based on Sm-Substituted Tungstophosphate and Its Electrofluorochromic Performance. ACS APPLIED MATERIALS & INTERFACES 2016; 8:11621-11628. [PMID: 27088254 DOI: 10.1021/acsami.6b03131] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We chose a Sm-containing sandwich-type tungstophosphate K3Cs8[Sm(PW11O39)2]·10H2O (SmPW11) as a molecular dyad, which contains photoluminescence and electrochromism components in a skeletal structure, and investigated its electrofluorochromic performance both in solution and in composite films. First, the electrochemical activity and luminescence property of SmPW11 were studied in different pH solutions to determine the optimal pH solution medium; and then, the electrofluorochromic performance of SmPW11 was investigated under the optimized pH solution medium. Subsequently, the composite films containing SmPW11 were prepared on quartz substrates and conductive ITO substrates through a layer-by-layer (LbL) assembly method, using PDDA and PEI as molecular linkers. Characterization methods of the composite films include UV-vis spectra, fluorescence spectroscopy, cyclic voltammetry (CV), bulk electrolysis with coulometry, chronoamperometry, X-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM). Finally, in situ UV-vis and fluorescence spectroelectrochemical systems were used to research electrofluorochromic properties for the composite films under electrochemical modulation. The results indicate that the composite films display not only orange luminescence emission but also reversible orange luminescence switching behaviors manipulated by the redox process of tungstophosphate species PW11 via the energy transfer between the orange luminescence component Sm and electroreduced species of tungstophosphate PW11.
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Affiliation(s)
- Wenmei Gao
- College of Chemistry, State Key Laboratory of Supramolecular Structure and Materials, Jilin University , Changchun, 130012, People's Republic of China
| | - Tian Yu
- College of Electrical and Electronic Engineering, Changchun University of Technology , Changchun, 130012, People's Republic of China
| | - Yu Du
- College of Chemistry, State Key Laboratory of Supramolecular Structure and Materials, Jilin University , Changchun, 130012, People's Republic of China
| | - Ruiqiang Wang
- College of Chemistry, State Key Laboratory of Supramolecular Structure and Materials, Jilin University , Changchun, 130012, People's Republic of China
| | - Lixin Wu
- College of Chemistry, State Key Laboratory of Supramolecular Structure and Materials, Jilin University , Changchun, 130012, People's Republic of China
| | - Lihua Bi
- College of Chemistry, State Key Laboratory of Supramolecular Structure and Materials, Jilin University , Changchun, 130012, People's Republic of China
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26
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Abstract
This article reviews the basic principles of and recent developments in electrochromic, photochromic, and thermochromic materials for applications in smart windows. Compared with current static windows, smart windows can dynamically modulate the transmittance of solar irradiation based on weather conditions and personal preferences, thus simultaneously improving building energy efficiency and indoor human comfort. Although some smart windows are commercially available, their widespread implementation has not yet been realized. Recent advances in nanostructured materials provide new opportunities for next-generation smart window technology owing to their unique structure-property relations. Nanomaterials can provide enhanced coloration efficiency, faster switching kinetics, and longer lifetime. In addition, their compatibility with solution processing enables low-cost and high-throughput fabrication. This review also discusses the importance of dual-band modulation of visible and near-infrared (NIR) light, as nearly 50% of solar energy lies in the NIR region. Some latest results show that solution-processable nanostructured systems can selectively modulate the NIR light without affecting the visible transmittance, thus reducing energy consumption by air conditioning, heating, and artificial lighting.
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Affiliation(s)
- Yang Wang
- McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, Texas 78712; ,
| | - Evan L Runnerstrom
- McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, Texas 78712; , .,Department of Materials Science & Engineering, University of California, Berkeley, California 94720;
| | - Delia J Milliron
- McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, Texas 78712; ,
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27
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Rodrigues LC, Custódio CA, Reis RL, Mano JF. Light responsive multilayer surfaces with controlled spatial extinction capability. J Mater Chem B 2016; 4:1398-1404. [PMID: 32263106 DOI: 10.1039/c5tb02606g] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Multilayer systems obtained using the Layer-by-Layer (LbL) technology have been proposed for a variety of biomedical applications in tissue engineering and regenerative medicine. LbL assembly is a simple and highly versatile method to modify surfaces and fabricate robust and highly-ordered nanostructured coatings over almost any type of substrates and with a wide range of substances. The incorporation of polyoxometalate (POM) inorganic salts as constituents of the layers presents a possibility of promoting light-stimuli responses in LbL substrates. We propose the design of a biocompatible photo-responsive multilayer system based on a Preyssler-type POM ([NaP5W30O110]14-) and a natural origin polymer, chitosan, using the LbL methodology. The photo-reduction properties of the POM allow the spatially controlled disruption of the assembled layers due to the weakening of the electrostatic interactions between the layers. This system has found applicability in detaching devices, such as the cell sheet technology, which may solve the drawbacks actually found in other cell treatment proposals.
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Affiliation(s)
- Luísa C Rodrigues
- 3B's Research Group - Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, Avepark - Parque de Ciência e Tecnologia, Zona Industrial da Gandra, 4805-017 Barco, Guimarães, Portugal ICVS/3B's - PT Government Associate Laboratory, Braga/Guimarães, Portugal.
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28
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Ma X, Li H, Chen L, Zhao J. The main progress over the past decade and future outlook on high-nuclear transition-metal substituted polyoxotungstates: from synthetic strategies, structural features to functional properties. Dalton Trans 2016; 45:4935-60. [DOI: 10.1039/c5dt05020k] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this article, we discuss the synthetic methodologies, structural diversities and relevant properties of the high-nuclear TMSPTs reported in the past decade.
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Affiliation(s)
- Xing Ma
- Henan Key Laboratory of Polyoxometalate Chemistry
- Institute of Molecular and Crystal Engineering
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng
| | - Hailou Li
- Henan Key Laboratory of Polyoxometalate Chemistry
- Institute of Molecular and Crystal Engineering
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng
| | - Lijuan Chen
- Henan Key Laboratory of Polyoxometalate Chemistry
- Institute of Molecular and Crystal Engineering
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng
| | - Junwei Zhao
- Henan Key Laboratory of Polyoxometalate Chemistry
- Institute of Molecular and Crystal Engineering
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng
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29
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Gao W, Yu T, Wu L, Bi L. Fabrication of white luminescence composite films containing Dy-polyoxometalate and the study of their luminescence switching behaviors. Chem Commun (Camb) 2016; 52:10403-6. [DOI: 10.1039/c6cc04949d] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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30
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Zuo J, Gao N, Yu Z, Kang L, O’Halloran KP, Pang H, Zhang Z, Ma H. An amperometric sensor of iodate based on the composite film of a crown heteropolyanions and Cu@Ag nanoparticles. J Electroanal Chem (Lausanne) 2015. [DOI: 10.1016/j.jelechem.2015.05.039] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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31
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Raj G, Swalus C, Delcroix M, Devillers M, Dupont-Gillain C, Gaigneaux EM. In situ quartz crystal microbalance monitoring of the adsorption of polyoxometalate on a polyampholyte polymer matrix. J Colloid Interface Sci 2015; 445:24-30. [DOI: 10.1016/j.jcis.2014.12.035] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2014] [Revised: 12/08/2014] [Accepted: 12/12/2014] [Indexed: 10/24/2022]
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32
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Liao JZ, Zhang HL, Wang SS, Yong JP, Wu XY, Yu R, Lu CZ. Multifunctional Radical-Doped Polyoxometalate-Based Host–Guest Material: Photochromism and Photocatalytic Activity. Inorg Chem 2015; 54:4345-50. [DOI: 10.1021/acs.inorgchem.5b00041] [Citation(s) in RCA: 118] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Jian-Zhen Liao
- Key
Laboratory of Design and Assembly of Functional Nanostructures, Fujian
Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, P. R. China
- Graduate University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Hai-Long Zhang
- Key
Laboratory of Design and Assembly of Functional Nanostructures, Fujian
Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, P. R. China
- Graduate University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Sa-Sa Wang
- Key
Laboratory of Design and Assembly of Functional Nanostructures, Fujian
Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, P. R. China
| | - Jian-Ping Yong
- Key
Laboratory of Design and Assembly of Functional Nanostructures, Fujian
Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, P. R. China
| | - Xiao-Yuan Wu
- Key
Laboratory of Design and Assembly of Functional Nanostructures, Fujian
Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, P. R. China
| | - Rongmin Yu
- Key
Laboratory of Design and Assembly of Functional Nanostructures, Fujian
Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, P. R. China
| | - Can-Zhong Lu
- Key
Laboratory of Design and Assembly of Functional Nanostructures, Fujian
Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, P. R. China
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Ishimoto R, Kamata K, Suzuki K, Yamaguchi K, Mizuno N. Synthesis and structural characterization of BINOL-modified chiral polyoxometalates. Dalton Trans 2015; 44:10947-51. [DOI: 10.1039/c5dt01338k] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Chiral ligand-modified polyoxometalates (POMs) R-I and S-I were successfully synthesized by the introduction of BINOL into the dititanium-substituted POM.
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Affiliation(s)
- Ryo Ishimoto
- Department of Applied Chemistry
- School of Engineering
- The University of Tokyo
- Tokyo
- Japan
| | - Keigo Kamata
- Department of Applied Chemistry
- School of Engineering
- The University of Tokyo
- Tokyo
- Japan
| | - Kosuke Suzuki
- Department of Applied Chemistry
- School of Engineering
- The University of Tokyo
- Tokyo
- Japan
| | - Kazuya Yamaguchi
- Department of Applied Chemistry
- School of Engineering
- The University of Tokyo
- Tokyo
- Japan
| | - Noritaka Mizuno
- Department of Applied Chemistry
- School of Engineering
- The University of Tokyo
- Tokyo
- Japan
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34
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Wang H, Poya Y, Chen X, Jia T, Wang X, Shi J. Hydrogen peroxide as an oxidant in starch oxidation using molybdovanadophosphate for producing a high carboxylic content. RSC Adv 2015. [DOI: 10.1039/c5ra07747h] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Molybdovanadophosphate has been used for producing a high carboxyl content from starch by hydrogen peroxide.
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Affiliation(s)
- Hang Wang
- Key Lab of Polyoxometalate Science of Ministry of Education
- Faculty of Chemistry
- Northeast Normal University
- Changchun 130024
- P. R. China
| | - Yalinu Poya
- Key Lab of Polyoxometalate Science of Ministry of Education
- Faculty of Chemistry
- Northeast Normal University
- Changchun 130024
- P. R. China
| | - Xiaoli Chen
- Key Lab of Polyoxometalate Science of Ministry of Education
- Faculty of Chemistry
- Northeast Normal University
- Changchun 130024
- P. R. China
| | - Ting Jia
- Key Lab of Polyoxometalate Science of Ministry of Education
- Faculty of Chemistry
- Northeast Normal University
- Changchun 130024
- P. R. China
| | - Xiaohong Wang
- Key Lab of Polyoxometalate Science of Ministry of Education
- Faculty of Chemistry
- Northeast Normal University
- Changchun 130024
- P. R. China
| | - Junyou Shi
- Wood Material Science and Engineering Key Laboratory of Jilin Province
- Beihua University
- P. R. China
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35
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Herrmann S, Margraf JT, Clark T, Streb C. Thermochromic and solvatochromic properties of Lindqvist polyoxometalates. Chem Commun (Camb) 2015; 51:13702-5. [DOI: 10.1039/c5cc05730b] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The thermochromic and solvatochromic properties of a family of Lindqvist polyoxometalates are rationalized by experimental and computational methods.
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Affiliation(s)
- S. Herrmann
- Institute of Inorganic Chemistry I
- Ulm University
- 89081 Ulm
- Germany
| | - J. T. Margraf
- Department Chemistry and Pharmacy
- Computer-Chemistry-Center
- Friedrich-Alexander-University Erlangen-Nuremberg
- 91052 Erlangen
- Germany
| | - T. Clark
- Department Chemistry and Pharmacy
- Computer-Chemistry-Center
- Friedrich-Alexander-University Erlangen-Nuremberg
- 91052 Erlangen
- Germany
| | - C. Streb
- Institute of Inorganic Chemistry I
- Ulm University
- 89081 Ulm
- Germany
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36
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Kalyani V, Satyanarayana VSV, Singh V, Pradeep CP, Ghosh S, Sharma SK, Gonsalves KE. New Polyoxometalates Containing Hybrid Polymers and Their Potential for Nano-Patterning. Chemistry 2014; 21:2250-8. [DOI: 10.1002/chem.201405369] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2014] [Indexed: 11/07/2022]
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37
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Chen X, Yan S, Wang H, Hu Z, Wang X, Huo M. Aerobic oxidation of starch catalyzed by isopolyoxovanadate Na4Co(H2O)6V10O28. Carbohydr Polym 2014; 117:673-680. [PMID: 25498687 DOI: 10.1016/j.carbpol.2014.10.066] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2014] [Revised: 10/29/2014] [Accepted: 10/30/2014] [Indexed: 11/24/2022]
Abstract
The partial oxidation of starch was achieved in the presence of oxygen with Na4Co(H2O)6V10O28·18H2O (abbreviated as CoV10) as catalyst. The oxidation degree of starch was determined by FT-IR, XRD and SEM measurements, which indicated that the aerobic oxidation of starch was promoted by oxidative catalyst CoV10. The application of CoV10 could give a high oxidation degree (DO) of 1.35 COOH/100 GU and 2.07 CO/100 GU with 86 wt.% yield of solid starch under mild reaction conditions (pH=6; reaction time, 8 h; temperature, 50 °C; catalyst amount, 8 mg, when 1.5 g starch was used as substrate; atmospheric pressure). Among some vanadium compounds, CoV10 exhibited 4-fold activity higher than orthovanadate due to its coordination effect of cobalt and V10O28. Meanwhile, CoV10 could be recycled for six times with only a slight decrease in activity. Thus, CoV10/O2 is one of the most efficient systems for partial oxidation of starch reported so far.
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Affiliation(s)
- Xiaoli Chen
- Key Lab of Polyoxometalate Science of Ministry of Education, Faculty of Chemistry, Northeast Normal University, Changchun 130024, PR China
| | - Siqi Yan
- Key Lab of Polyoxometalate Science of Ministry of Education, Faculty of Chemistry, Northeast Normal University, Changchun 130024, PR China
| | - Hang Wang
- Key Lab of Polyoxometalate Science of Ministry of Education, Faculty of Chemistry, Northeast Normal University, Changchun 130024, PR China
| | - Zhiyun Hu
- Key Lab of Polyoxometalate Science of Ministry of Education, Faculty of Chemistry, Northeast Normal University, Changchun 130024, PR China
| | - Xiaohong Wang
- Key Lab of Polyoxometalate Science of Ministry of Education, Faculty of Chemistry, Northeast Normal University, Changchun 130024, PR China.
| | - Mingxin Huo
- School of Urban and Environmental Sciences, Northeast Normal University, Changchun 130024, PR China
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Raj G, Swalus C, Arendt E, Eloy P, Devillers M, Gaigneaux EM. Controlling the dispersion of supported polyoxometalate heterogeneous catalysts: impact of hybridization and the role of hydrophilicity-hydrophobicity balance and supramolecularity. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2014; 5:1749-59. [PMID: 25383286 PMCID: PMC4222433 DOI: 10.3762/bjnano.5.185] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/30/2014] [Accepted: 09/19/2014] [Indexed: 06/04/2023]
Abstract
The hybridization of polyoxometalates (POMs) through an organic-inorganic association offers several processing advantages in the design of heterogeneous catalysts. A clear understanding of the organization of these hybrid materials on solid surfaces is necessary to optimise their properties. Herein, we report for the first time the organization of Keggin phosphotungstic [PW12O40](3-) and Wells-Dawson (WD) phosphomolybdic [P2Mo18O62](6-) anions deposited on mica (hydrophilic), and highly oriented pyrolytic graphite (HOPG) (hydrophobic) surfaces. Next, the supramolecular organization of the organic-inorganic hybrid materials formed from the association of POM anions and dimethyldioctadecylammonium bromide (DODA) is investigated as a function of the hydrophilic or hydrophobic nature of the surfaces. The height of the Keggin-POM anions, measured with tapping mode (TM-AFM) is always in good agreement with the molecular dimension of symmetric Keggin-POM anions (ca. 1 nm). However, the asymmetric WD-POM anions form monolayer assemblies on the surfaces with the orientation of their long molecular axis (ca. 1.6 nm) depending on the hydrophilic or hydrophobic properties of the substrate. Namely, the long axis is parallel on mica, and perpendicular on HOPG. When hybridized with DODA, the organization of the hybrid material is dictated by the interaction of the alkyl side chains of DODA with the substrate surface. On HOPG, the DODA-POM hybrid forms small domains of epitaxially arranged straight nanorod structures with their orientation parallel to each other. Conversely, randomly distributed nanospheres are formed when the hybrid material is deposited on freshly cleaved mica. Finally, a UV-ozone treatment of the hybrid material allows one to obtain highly dispersed isolated POM entities on both hydrophilic and hydrophobic surfaces. The hybridization strategy to prevent the clustering of POMs on various supports would enable to develop highly dispersed POM-based heterogeneous catalysts with enhanced functionalities.
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Affiliation(s)
- Gijo Raj
- Institute of Condensed Matter and Nanosciences, Division MOlecules, Solids and reactiviTy, Université catholique de Louvain, Croix du Sud 2, L7.05.17, B-1348, Louvain-la-Neuve, Belgium
- CEA Grenoble, INAC, UMR 5819 SPRAM (CEA/CNRS/UJF-Grenoble 1), Laboratoire d’Electronique Moléculaire, Organique et Hybride, 17 rue des Martyrs, 38054 Grenoble cedex 9, France
| | - Colas Swalus
- Institute of Condensed Matter and Nanosciences, Division MOlecules, Solids and reactiviTy, Université catholique de Louvain, Croix du Sud 2, L7.05.17, B-1348, Louvain-la-Neuve, Belgium
| | - Eglantine Arendt
- Institute of Condensed Matter and Nanosciences, Division MOlecules, Solids and reactiviTy, Université catholique de Louvain, Croix du Sud 2, L7.05.17, B-1348, Louvain-la-Neuve, Belgium
| | - Pierre Eloy
- Institute of Condensed Matter and Nanosciences, Division MOlecules, Solids and reactiviTy, Université catholique de Louvain, Croix du Sud 2, L7.05.17, B-1348, Louvain-la-Neuve, Belgium
| | - Michel Devillers
- Institute of Condensed Matter and Nanosciences, Division MOlecules, Solids and reactiviTy, Université catholique de Louvain, Croix du Sud 2, L7.05.17, B-1348, Louvain-la-Neuve, Belgium
| | - Eric M Gaigneaux
- Institute of Condensed Matter and Nanosciences, Division MOlecules, Solids and reactiviTy, Université catholique de Louvain, Croix du Sud 2, L7.05.17, B-1348, Louvain-la-Neuve, Belgium
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Qiu J, Zhou X, Mo Q, Liu F, Jiang L. Electrostatic assembled of Keggin-type polyoxometalates onto poly(4-vinylpyridine)-grafted poly(vinylidene fluoride) membranes. RSC Adv 2014. [DOI: 10.1039/c4ra07978g] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
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40
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Jing X, Zou D, Meng Q, Zhang W, Zhang F, Feng W, Han X. Fabrication and visible-light photochromism of novel hybrid inorganic–organic film based on polyoxometalates and ethyl cellulose. INORG CHEM COMMUN 2014. [DOI: 10.1016/j.inoche.2014.05.030] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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41
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Liao JZ, Dui XJ, Zhang HL, Wu XY, Lu CZ. Polyoxometalate anion–π interaction-directed assembly of a three-dimensional hydrogen-bonded supramolecular framework with nanoscale porosity. CrystEngComm 2014. [DOI: 10.1039/c4ce01283f] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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42
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Souza AL, Filho GT, Kubota LT, Mendes RK, Botelho do Rego AM, Oliveira ON, Henry de Villeneuve C, Chazalviel JN, Allongue P, Ozanam F, Filho UPR. Poly(dimethylsiloxane) as a pre-coating in layer-by-layer films containing phosphotungstate nanoclusters electrochemically sensitive toward s-triazines. RSC Adv 2014. [DOI: 10.1039/c4ra01468e] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
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Yaqub M, Walsh JJ, Keyes TE, Proust A, Rinfray C, Izzet G, McCormac T, Forster RJ. Electron transfer to covalently immobilized Keggin polyoxotungstates on gold. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:4509-4516. [PMID: 24670101 DOI: 10.1021/la4048648] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Spontaneously adsorbed monolayers have been formed on gold electrodes using a Keggin polyoxotungstate with covalently attached alkanethiol linkers of two different lengths. Films of both polyoxotungstates show two well-defined reduction processes associated with the polyoxotungstate centers where the ionic liquid, [BMIM][BF4], acts as supporting electrolyte. The surface coverages are both less than that expected for a close-packed monolayer. For the short and long linkers, the voltammetric response can be described in terms of the Butler-Volmer response involving a surface confined species using standard heterogeneous electron transfer rate constants of 170 and 140 s(-1) for the first reduction and 150 and 100 s(-1) for the second reduction processes, respectively. The rate of electron transfer to a solution phase redox probe, ferrocyanide, is significantly more sensitive to the length of the linker than the rate of electron transfer to the tungstate centers. This behavior probably arises due to potential-induced changes in the film structure.
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Li YY, Zhao JW, Wei Q, Yang BF, He H, Yang GY. Two Organic-Inorganic Hybrid 3D {P5W30}-Based Heteropolyoxotungstates with Transition-Metal/Ln-Carboxylate-Ln Connectors. Chem Asian J 2013; 9:858-67. [DOI: 10.1002/asia.201301305] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2013] [Revised: 11/04/2013] [Indexed: 01/06/2023]
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46
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A sensor of a polyoxometalate and Au–Pd alloy for simultaneously detection of dopamine and ascorbic acid. Electrochim Acta 2013. [DOI: 10.1016/j.electacta.2013.09.109] [Citation(s) in RCA: 106] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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47
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Ball V, Ringwald C, Bour J, Michel M, Al-Oweini R, Kortz U. Multilayer films made from poly(allylamine) and phosphorous containing polyoxometalates: Focus on the zeta potential. J Colloid Interface Sci 2013; 409:166-73. [DOI: 10.1016/j.jcis.2013.07.061] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2013] [Revised: 07/24/2013] [Accepted: 07/27/2013] [Indexed: 10/26/2022]
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48
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Raj G, Swalus C, Guillet A, Devillers M, Nysten B, Gaigneaux EM. Supramolecular organization in organic-inorganic heterogeneous hybrid catalysts formed from polyoxometalate and poly(ampholyte) polymer. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:4388-4395. [PMID: 23480273 DOI: 10.1021/la400055t] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Hybridization of polyoxometalates (POMs) via the formation of an organic-inorganic association constitutes a new route to develop a heterogeneous POM catalyst with tunable functionality imparted through supramolecular assembly. Herein, we report on strategies to obtain tunable well-defined supramolecular architectures of an organic-inorganic heterogeneous hybrid catalyst formed by the association of a hydrophobically substituted polyampholyte copolymer (poly N, N-diallyl-N-hexylamine-alt-maleic acid) and phosphotungstic acid (H3PW12O40) POMs. The self-assembling property of the initial polyampholyte copolymer matrix is modulated by controlling the pH of the hybridization solution. When deposited on a mica surface, isolated, long and extended polymer chains are formed under basic conditions (pH 7.9), while globular or coiled structures are formed under acidic conditions (pH 2). The supramolecular assembly of the POM-polymer hybrid is found to be directed by the type and quantities of charges present on the polyampholyte copolymer, which themselves depend on the pH conditions. The hypothesis is that the Keggin type [PW12O40](3-) anions, which have a size of ~1 nm, electrostatically bind to the positive charge sites of the polymer backbone. The hybrid material stabilized at pH 5.3 consists of POM-decorated polymer chains. Statistical analysis of distances between pairs of POM entities show narrow density distributions, suggesting that POM entities are attached to the polymer chains with a high level of order. Conversely, under acidic conditions (pH 2), the hybrid shows the formation of a core-shell type of structure. The strategies reported here, to tune the supramolecular assembly of organic-inorganic hybrid materials, are highly valuable for the design and a more rational utilization of POM heterogeneous catalysts in several chemical transformations.
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Affiliation(s)
- Gijo Raj
- Institute of Condensed Matter and Nanosciences, Division Molecules, Solids and Reactivity, Université catholique de Louvain, Louvain-la-Neuve, Belgium.
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Granadeiro CM, de Castro B, Balula SS, Cunha-Silva L. Lanthanopolyoxometalates: From the structure of polyanions to the design of functional materials. Polyhedron 2013. [DOI: 10.1016/j.poly.2012.09.037] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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50
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Hirano T, Uehara K, Uchida S, Hibino M, Kamata K, Mizuno N. Synthesis and Structural Characterization of Inorganic-Organic-Inorganic Hybrids of Dipalladium-Substituted γ-Keggin Silicodecatungstates. Inorg Chem 2013; 52:2662-70. [DOI: 10.1021/ic302703k] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Tomohisa Hirano
- Department of Applied Chemistry, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo
113-8656, Japan
| | - Kazuhiro Uehara
- Department of Applied Chemistry, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo
113-8656, Japan
| | - Sayaka Uchida
- Department of Applied Chemistry, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo
113-8656, Japan
| | - Mitsuhiro Hibino
- Department of Applied Chemistry, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo
113-8656, Japan
| | - Keigo Kamata
- Department of Applied Chemistry, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo
113-8656, Japan
| | - Noritaka Mizuno
- Department of Applied Chemistry, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo
113-8656, Japan
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