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Synthesis, Physical Properties and Application of a Series of New Polyoxometalate-Based Ionic Liquids. Molecules 2021; 26:molecules26020496. [PMID: 33477711 PMCID: PMC7831901 DOI: 10.3390/molecules26020496] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2020] [Revised: 01/07/2021] [Accepted: 01/08/2021] [Indexed: 11/18/2022] Open
Abstract
This paper deals with the preparation and the characterization of four new ionic liquids resulting from the pairing of various polyoxotungstates or polyoxomolybdates with the cation trihexyltetradecylphosphonium. The physical properties measured by different techniques evidence that the viscosity and the rheological behaviors of such POM-based ionic liquids, POM-ILs, strongly depend on the nature of the POM, especially its charge. Playing on the nature of the POM, we can indeed obtain Newtonian liquids or some much more viscous materials exhibiting characteristics of resins or pseudo-plastics. In a second part of this study, the potentialities of using such materials both as solvent and catalyst for the oxidation of a series of alcohols are presented as proof of concept. This part highlights great differences in strength and selectivity as a function of the POM-IL used. Furthermore, a very simple way to recycle the catalyst is also presented.
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Layer-by-layer assembly of graphene oxide and 12-molybdosilicate composite films for the electrocatalytic reduction of chloroform in neutral aqueous solution. Electrochim Acta 2020. [DOI: 10.1016/j.electacta.2020.135987] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Ali B, McCormac T, Maccato C, Barreca D, Carraro G. Multilayer assemblies of a Cu-phthalocyanine with Dawson type polyoxometalates (POMs) for the electrocatalytic reduction of phosphate. J Electroanal Chem (Lausanne) 2020. [DOI: 10.1016/j.jelechem.2019.113770] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Karunakaran SC, Cafferty BJ, Jain KS, Schuster GB, Hud NV. Reversible Transformation of a Supramolecular Hydrogel by Redox Switching of Methylene Blue-A Noncovalent Chain Stopper. ACS OMEGA 2020; 5:344-349. [PMID: 31956781 PMCID: PMC6964268 DOI: 10.1021/acsomega.9b02785] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2019] [Accepted: 11/15/2019] [Indexed: 05/31/2023]
Abstract
The simple and reversible control of the degree of polymerization, and thereby the bulk material properties, of a supramolecular polymer is reported. Noncovalent capping agents (chain stoppers) modulate the length of supramolecular polymers by stacking on the surfaces of the polymer's ends. Methylene blue (MB) is a positively charged, planar polycyclic dye that acts as a chain stopper. It can be reversibly switched between its colored, planar, cationic state and a colorless, nonplanar, neutral state (leucomethylene blue, LMB) by reduction with ascorbic acid and then reoxidized to MB by O2. LMB does not act as a chain stopper. This behavior was utilized to reversibly trigger the gel to sol transformation of supramolecular polymers formed by the self-assembly of hexameric rosettes comprising 2,4,6-triaminopyrimidine and a hexanoic acid-substituted cyanuric acid (CyCo6) in aqueous media. The results of our experiments highlight the ability of this approach to reversibly switch between the gel and solution states of materials formed from supramolecular polymers and thereby control their bulk properties.
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Martinetto Y, Pégot B, Roch‐Marchal C, Cottyn‐Boitte B, Floquet S. Designing Functional Polyoxometalate‐Based Ionic Liquid Crystals and Ionic Liquids. Eur J Inorg Chem 2019. [DOI: 10.1002/ejic.201900990] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Yohan Martinetto
- Institut Lavoisier de Versailles, UMR 8180 Université de Versailles St‐Quentin en Yvelines, Université Paris‐Saclay 45 Avenue des Etats‐Unis 78035 Versailles France
- Institut Jean‐Pierre Bourgin, INRA, Agro Paris Tech, CNRS Université Paris Saclay 78000 Versailles France
| | - Bruce Pégot
- Institut Lavoisier de Versailles, UMR 8180 Université de Versailles St‐Quentin en Yvelines, Université Paris‐Saclay 45 Avenue des Etats‐Unis 78035 Versailles France
| | - Catherine Roch‐Marchal
- Institut Lavoisier de Versailles, UMR 8180 Université de Versailles St‐Quentin en Yvelines, Université Paris‐Saclay 45 Avenue des Etats‐Unis 78035 Versailles France
| | - Betty Cottyn‐Boitte
- Institut Jean‐Pierre Bourgin, INRA, Agro Paris Tech, CNRS Université Paris Saclay 78000 Versailles France
| | - Sébastien Floquet
- Institut Lavoisier de Versailles, UMR 8180 Université de Versailles St‐Quentin en Yvelines, Université Paris‐Saclay 45 Avenue des Etats‐Unis 78035 Versailles France
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Naseer R, Ali B, Laffir F, Kailas L, Dickinson C, Armstrong G, McCormac T. Transition Metal-Substituted Krebs-Type Polyoxometalate-Doped PEDOT Films. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:11007-11015. [PMID: 30892897 DOI: 10.1021/acs.langmuir.8b03785] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The transition metal-substituted Krebs-type polyoxometalates (POMs) [Sb2W20M2O70(H2O)6]n-, M = Fe(III), Co(II), or Cu(II), were surface immobilized within the conducting polymer 3,4-ethylenedioxythiophene (PEDOT) on glassy carbon electrode surfaces. The immobilized films of different thicknesses were characterized by electrochemical and surface-based techniques. The inherent redox activity for the Krebs-type POMs, [Sb2W20M2O70(H2O)6]n-, M = Fe(III), Co(II), or Cu(II), that were observed in the solution phase were maintained in the polymeric PEDOT matrix. The resulting films were found to be extremely stable toward redox switching between the various POM-based redox states. The films exhibited pH-dependent redox activity and thin layer behavior up to 100 mV s-1. The films were found to be highly conductive through the employment of electrochemical impedance spectroscopy. Surface characterization of the films was carried out by X-ray photoelectron spectroscopy, atomic force microscopy, and scanning electron microscopy graph.
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Affiliation(s)
- R Naseer
- Electrochemistry Research Group, Department of Applied Science , Dundalk Institute of Technology , Dublin Road Dundalk , County Louth A91 K584 , Ireland
| | - B Ali
- Electrochemistry Research Group, Department of Applied Science , Dundalk Institute of Technology , Dublin Road Dundalk , County Louth A91 K584 , Ireland
| | - F Laffir
- Bernal Institute , University of Limerick , Limerick V94 T9PX , Ireland
| | - L Kailas
- Bernal Institute , University of Limerick , Limerick V94 T9PX , Ireland
| | - C Dickinson
- Bernal Institute , University of Limerick , Limerick V94 T9PX , Ireland
| | - G Armstrong
- Bernal Institute , University of Limerick , Limerick V94 T9PX , Ireland
| | - T McCormac
- Electrochemistry Research Group, Department of Applied Science , Dundalk Institute of Technology , Dublin Road Dundalk , County Louth A91 K584 , Ireland
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Ali B, Imar S, Laffir F, McCormac T. Electrochemical, surface and electrocatalytic properties of electrode multilayer assemblies composed of a ruthenium metallodendrimer and a wheel-shaped Cu-20 Tungstophosphate. J Electroanal Chem (Lausanne) 2019. [DOI: 10.1016/j.jelechem.2019.01.047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Ali B, Laffir F, Kailas L, Armstrong G, Kailas L, O'Connell R, McCormac T. Electrochemical Characterisation of NiII
-Crown-Type Polyoxometalate-Doped Polypyrrole Films for the Catalytic Reduction of Bromate in Water. Eur J Inorg Chem 2019. [DOI: 10.1002/ejic.201801106] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Bushra Ali
- Electrochemistry Research Group; Applied Sciences; Dundalk Institute of Technology; Dublin Road Dundalk Ireland
| | - Fathima Laffir
- Bernal Institute; Applied Sciences; University of Limerick; Limerick Ireland
| | - Lekshmi Kailas
- Bernal Institute; Applied Sciences; University of Limerick; Limerick Ireland
| | - Gordon Armstrong
- Bernal Institute; Applied Sciences; University of Limerick; Limerick Ireland
| | - Lekshmi Kailas
- Bernal Institute; Applied Sciences; University of Limerick; Limerick Ireland
| | - Robbie O'Connell
- Bernal Institute; Applied Sciences; University of Limerick; Limerick Ireland
| | - Timothy McCormac
- Electrochemistry Research Group; Applied Sciences; Dundalk Institute of Technology; Dublin Road Dundalk Ireland
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Ali B, Imar S, Laffir F, Kailas L, Maccato C, McCormac T. Electrochemical, surface and electrocatalytic properties of layer-by-layer multilayer assemblies composed of silver nanoparticles and a Ni(II)-crown type polyoxometalate. J Electroanal Chem (Lausanne) 2018. [DOI: 10.1016/j.jelechem.2018.07.036] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Walsh JJ, Bond AM, Forster RJ, Keyes TE. Hybrid polyoxometalate materials for photo(electro-) chemical applications. Coord Chem Rev 2016. [DOI: 10.1016/j.ccr.2015.06.016] [Citation(s) in RCA: 218] [Impact Index Per Article: 27.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Bai Z, Zhou C, Gao N, Pang H, Ma H. A chitosan–Pt nanoparticles/carbon nanotubes-doped phosphomolybdate nanocomposite as a platform for the sensitive detection of nitrite in tap water. RSC Adv 2016. [DOI: 10.1039/c5ra19383d] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A polyoxometalate-based composite film decorated with CNTs and Pt–CHIT NPs was constructed on an electrode using the LBL self-assembly method. It acted as an electrochemical nitrite sensor with greatly enhanced electron transfer ability and sensing performance.
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Affiliation(s)
- Zhenyuan Bai
- Key Laboratory of Green Chemical Engineering and Technology of College of Heilongjiang Province
- College of Chemical and Environmental Engineering
- Harbin University of Science and Technology
- Harbin 150040
- China
| | - Chunlei Zhou
- Key Laboratory of Green Chemical Engineering and Technology of College of Heilongjiang Province
- College of Chemical and Environmental Engineering
- Harbin University of Science and Technology
- Harbin 150040
- China
| | - Ning Gao
- Key Laboratory of Green Chemical Engineering and Technology of College of Heilongjiang Province
- College of Chemical and Environmental Engineering
- Harbin University of Science and Technology
- Harbin 150040
- China
| | - Haijun Pang
- Key Laboratory of Green Chemical Engineering and Technology of College of Heilongjiang Province
- College of Chemical and Environmental Engineering
- Harbin University of Science and Technology
- Harbin 150040
- China
| | - Huiyuan Ma
- Key Laboratory of Green Chemical Engineering and Technology of College of Heilongjiang Province
- College of Chemical and Environmental Engineering
- Harbin University of Science and Technology
- Harbin 150040
- China
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Imar S, Yaqub M, Maccato C, Dickinson C, Laffir F, Vagin M, McCormac T. Nitrate and Nitrite Electrocatalytic Reduction at Layer-by-Layer Films Composed of Dawson-type Heteropolyanions Mono-substituted with Transitional Metal Ions and Silver Nanoparticles. Electrochim Acta 2015. [DOI: 10.1016/j.electacta.2015.10.082] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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14
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Electrocatalysis by crown-type polyoxometalates multi-substituted by transition metal ions; Comparative study. Electrochim Acta 2015. [DOI: 10.1016/j.electacta.2015.07.152] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Imar S, Maccato C, Dickinson C, Laffir F, Vagin M, McCormac T. Enhancement of nitrite and nitrate electrocatalytic reduction through the employment of self-assembled layers of nickel- and copper-substituted crown-type heteropolyanions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:2584-2592. [PMID: 25644137 DOI: 10.1021/la503889j] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Multilayer assemblies of two crown-type type heteropolyanions (HPA), [Cu20Cl(OH)24(H2O)12(P8W48O184)](25-) and Ni4(P8W48O148)(WO2)](28-), have been immobilized onto glassy carbon electrode surfaces via the layer-by-layer (LBL) technique employing polycathion-stabilized silver nanoparticles (AgNP) as the cationic layer within the resulting thin films characterized by electrochemical and physical methods. The redox behaviors of both HPA monitored during LBL assembly with cyclic voltammetry and impedance spectroscopy revealed significant changes by immobilization. The presence of AgNPs led to the retention of film porosity and electronic conductivity, which has been shown with impedance and voltammeric studies of film permeabilities toward reversible redox probes. The resulting films have been characterized by physical methods. Finally, the electrocatalytic performance of obtained films with respect to nitrite and nitrate electrocatalytic reduction has been comparatively studied for both catalysts. Nickel atoms trapped inside HPA exhibited a higher specific activity for reduction.
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Affiliation(s)
- Shahzad Imar
- Electrochemistry Research Group, Department of Applied Science, Dundalk Institute of Technology , Dublin Road Dundalk, County Louth, Ireland
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Fernandes DM, Teixeira A, Freire C. Multielectrocatalysis by layer-by-layer films based on pararosaniline and vanadium-substituted phosphomolybdate. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:1855-1865. [PMID: 25603457 DOI: 10.1021/la5043266] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Hybrid multilayer films based on the two molecular species pararosaniline (PR) and Keggin-type polyoxometalate K5[PMo11VO40)] (PMo11V) were prepared on different substrates using the electrostatic layer-by-layer (LbL) self-assembly method. The film buildup, monitored by electronic spectroscopy, showed a regular stepwise growth, and X-ray photoelectron spectroscopy data confirmed the presence of both molecular components within the LbL films. Scanning electron microscopy images revealed a completely covered surface with a nonuniform distribution of film components, and atomic force microscopy images confirmed a rough surface. The film electrochemical responses and permeability were studied by cyclic voltammetry. Films revealed three Mo-based redox processes (Mo(VI) → Mo(V)) and one V-based redox process (V(V) → V(IV)) in the potential range between 0.8 and -0.4 V vs Ag/AgCl. Studies with the redox probes [Fe(CN)6](3-/4-) and [Ru(NH3)6](3+/2+) showed that the films maintain the permeability even after six bilayers. Furthermore, the {PR/PMo11V}n multilayer films exhibit excellent Mo-based electrocatalytic activity toward reduction of iodate and V-based electrocatalytic activity toward ascorbic acid oxidation, thus acting as a versatile multielectrocatalyst.
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Affiliation(s)
- Diana M Fernandes
- REQUIMTE, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto , 4169-007 Porto, Portugal
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Yaqub M, Imar S, Laffir F, Armstrong G, McCormac T. Investigations into the electrochemical, surface, and electrocatalytic properties of the surface-immobilized polyoxometalate, TBA3K[SiW10O36(PhPO)2]. ACS APPLIED MATERIALS & INTERFACES 2015; 7:1046-56. [PMID: 25478678 DOI: 10.1021/am5017864] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
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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Affiliation(s)
- Mustansara Yaqub
- Electrochemistry Research Group, Department of Applied Science, Dundalk Institute of Technology , Dundalk, County Louth, Ireland
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Naseer R, Mal SS, Ibrahim M, Kortz U, Armstrong G, Laffir F, Dickinson C, Vagin M, McCormac T. Redox, surface and electrocatalytic properties of layer-by-layer films based upon Fe(III)-substituted crown polyoxometalate [P8W48O184Fe16(OH)28(H2O)4]20-. Electrochim Acta 2014. [DOI: 10.1016/j.electacta.2014.03.099] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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19
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Anwar N, Sartorel A, Yaqub M, Wearen K, Laffir F, Armstrong G, Dickinson C, Bonchio M, McCormac T. Surface immobilization of a tetra-ruthenium substituted polyoxometalate water oxidation catalyst through the employment of conducting polypyrrole and the layer-by-layer (LBL) technique. ACS APPLIED MATERIALS & INTERFACES 2014; 6:8022-8031. [PMID: 24758586 DOI: 10.1021/am405295c] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
A tetra Ru-substituted polyoxometalate Na10[{Ru4O4(OH)2(H2O)4}(γ-SiW10O36)2] (Ru4POM) has been successfully immobilised onto glassy carbon electrodes and indium tin oxide (ITO) coated glass slides through the employment of a conducting polypyrrole matrix and the layer-by-layer (LBL) technique. The resulting Ru4POM doped polypyrrole films showed stable redox behavior associated with the Ru centres within the Ru4POM, whereas, the POM's tungsten-oxo redox centres were not accessible. The films showed pH dependent redox behavior within the pH range 2-5 whilst exhibiting excellent stability towards redox cycling. The layer-by-layer assembly was constructed onto poly(diallyldimethylammonium chloride) (PDDA) modified carbon electrodes by alternate depositions of Ru4POM and a Ru(II) metallodendrimer. The resulting Ru4POM assemblies showed stable redox behavior for the redox processes associated with Ru4POM in the pH range 2-5. The charge transfer resistance of the LBL films was calculated through AC-Impedance. Surface characterization of both the polymer and LBL Ru4POM films was carried out using atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM). Initial investigations into the ability of the Ru4POM LBL films to electrocatalytically oxidise water at pH 7 have also been conducted.
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Affiliation(s)
- Nargis Anwar
- Electrochemistry Research Group, Department of Applied Science, Dundalk Institute of Technology , Dublin Road, Dundalk, County Louth, Ireland
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Visible light sensitized photocurrent generation from electrostatically assembled thin films of [Ru(bpy)3]2+ and the polyoxometalate γ*-[W18O54(SO4)2]4−: Optimizing performance in a low electrolyte medium. J Electroanal Chem (Lausanne) 2013. [DOI: 10.1016/j.jelechem.2013.07.020] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Han Z, Guo Y, Tsunashima R, Song YF. Color-Tunable Luminescent Films Based on the Hybrid Assemblies of [EuW10O36]9-, Bis(N-methylacridinium) Nitrate, and Layered Double Hydroxide. Eur J Inorg Chem 2013. [DOI: 10.1002/ejic.201201135] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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