Attempts to immobilize catalytically active substituted-heteropolytungstates in multilayer film of charged polyelectrolyte poly(allylamine hydrochloride)

Ammam, Malika; Keita, Bineta; Nadjo, Louis; Mbomekallé, Israël Martyr; Fransaer, Jan

doi:10.1016/j.jelechem.2010.03.026

Cited by 28 publications

(14 citation statements)

References 47 publications

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“…The stability of Co 3d 7 is also in agreement with the absence of detectable electroactivity in voltammetry in similar polyoxopalladates and heteropolytungstates hosting 3d 7 Co II ions as well.…”

Section: Discussionsupporting

confidence: 78%

Polyoxopalladates as Prototype Molecular Hydrogen Uptake Systems and Novel In situ Hydrogen Detectors on the Nanoscale

et al. 2018

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Dodecapalladium(II) oxide-based molecular nanocubes encapsulating Fe 3+ (3d 5 ) or Co 2+ (3d 7 ) ions display facile hydrogen uptake with concurrent pronounced magnetization changes that suggests use as molecular hydrogen detection materials. Electronic and magnetic properties were investigated element-specifically by X-ray absorption spectroscopy and its associated magnetic circular and linear dichroisms. Hydrogenation reduces the Fe 3+ (3d 5 ) ions to a 3d 6 state while the Co 2+ 3d 7 configuration remains largely unaffected. However, in both [a]

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Section: Discussionsupporting

confidence: 78%

Polyoxopalladates as Prototype Molecular Hydrogen Uptake Systems and Novel In situ Hydrogen Detectors on the Nanoscale

et al. 2018

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“…Electrostatic repulsion from the cationic film layer was suggested in the literature as the probable cause for the partial or complete ejection of the transition metals from the polyoxometalate structure[40]. This ejection was observed by the loss of the transition metal's redox activity within the film[40]. The formation of the lacunary polyoxometalate by transition metal expulsion was confirmed by comparison to a film formed separately with the prepared lacunary polyoxometalate[40].…”

mentioning

confidence: 77%

“…This ejection was observed by the loss of the transition metal's redox activity within the film[40]. The formation of the lacunary polyoxometalate by transition metal expulsion was confirmed by comparison to a film formed separately with the prepared lacunary polyoxometalate[40]. Minor responses in the region of the transition metal's redox activity, typically not capable of being observed when the polyoxometalate's metal-oxide framework was also examined, suggested that any degradation/metal ejection was incomplete[40].…”

mentioning

confidence: 94%

“…The addition of the transition metal and its variation in size and charge in comparison to the metal oxide unit it was replacing were suspected of leading to more fragile polyoxometalate structures, noted for the Wells-Dawson typepolyoxometalates, α 1 -[P 2 W 17 V VI O 62 ] 8and α 2 -[P 2 W 17 O 61 (OH) 2 Fe III ][40]. Electrostatic repulsion from the cationic film layer was suggested in the literature as the probable cause for the partial or complete ejection of the transition metals from the polyoxometalate structure[40]. This ejection was observed by the loss of the transition metal's redox activity within the film[40].…”

mentioning

confidence: 99%

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Surface immobilisation of transition metal substituted Krebs type polyoxometalates, [X2W20M2O70(H2O)6]n− (X=Bi or Sb, M=Co2+ or Cu2+), by the layer by layer technique

Murphy

McCormac

2011

Electrochimica Acta

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Abstractfor the metallodendrimer, were clearly observed upon layer construction and redox switching within the pH domain of 2 to 6.5. The constructed multilayer assemblies exhibited pH dependent redox activity and thin layer behaviour up to 100 mV s -1 . The porosity and permeability of the individual multilayer assemblies towards an anionic probe was determined by AC impedance and cyclic voltammetry. The surface morphology of each multilayer was also determined by Atomic Force Microscopy (AFM).Keywords: Polyoxometalate; Krebs; Immobilisation; Layer by Layer (LBL); 3 IntroductionPolyoxometalates (POMs) are a class of redox active compounds formed from metal oxide subunits possessing discrete and varied redox chemistry that typically occurs with little to no change in the structure of the molecule. The varied and extensive properties of different polyoxometalates, such as their electrical, magnetic, optical and structural properties, has lead to them being employed across a wide range of applications, from catalysis to electronic devices [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. In order to reliably produce polyoxometalate-based devices for specific purposes a reproducible and practical method for their construction must be considered. Several methods are possible, including polymer doping and electrodeposition [17][18][19][20][21][22][23][24][25][26][27][28][29][30], the method utilised here is the layer-by-layer method. This layer-by-layer method has been known significant and reproducible film growth for a variety of applications while remaining a simple and rapid method for film formation [31 -35]. The layer-by-layer method uses alternating layer of cationic and anionic species in succession to form a multi-layer film on the desired surface. Such layer are formed from solution by electrostatic attractive of solution species to the film surface. This is repeated by exposure 4 of the film to different solutions containing either the cationic or anionic species to be adhered in repetition in order to construct the film.This work examines the properties of these polyoxometalates, [BiCo] , when contained with a multi-layered film composed of a base PDDA (polydiallydimethylammmonium) cationic layer followed by alternating layer of the anionic polyoxometalate and cationic ruthenium (II) pentaerythritol based metallodendrimers (ruthenium metallodrimer). The electrochemical behaviour of each polyoxometalates and the possibility of copper expulsion from the tungsten-oxide framework is examined. The structure of these films and its influence on their displayed properties is further examined by comparison to the behaviour of a well-known redox couple, potassium ferri/ferrocyanide, at potential inactive regions for the polyoxometalate-based film, as the film is constructed. This gave greater insight into additional physical/structural considerations for the film based properties involving solution based species. Experimental MaterialsAll starting materials were of synthetic grade and purchased from Sigma-Aldric...

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“…Alternatively, the interaction of the HPA with the cationic AgNP can lead to new complex formation characterized with different redox properties [68].…”

Section: Hpa Based Lbl Filmsmentioning

confidence: 99%

Nitrate and Nitrite Electrocatalytic Reduction at Layer-by-Layer Films Composed of Dawson-type Heteropolyanions Mono-substituted with Transitional Metal Ions and Silver Nanoparticles

Imar

Yaqub

Maccato

et al. 2015

Electrochimica Acta

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Attempts to immobilize catalytically active substituted-heteropolytungstates in multilayer film of charged polyelectrolyte poly(allylamine hydrochloride)

Cited by 28 publications

References 47 publications

Polyoxopalladates as Prototype Molecular Hydrogen Uptake Systems and Novel In situ Hydrogen Detectors on the Nanoscale

Polyoxopalladates as Prototype Molecular Hydrogen Uptake Systems and Novel In situ Hydrogen Detectors on the Nanoscale

Surface immobilisation of transition metal substituted Krebs type polyoxometalates, [X2W20M2O70(H2O)6]n− (X=Bi or Sb, M=Co2+ or Cu2+), by the layer by layer technique

Nitrate and Nitrite Electrocatalytic Reduction at Layer-by-Layer Films Composed of Dawson-type Heteropolyanions Mono-substituted with Transitional Metal Ions and Silver Nanoparticles

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