Polyoxoanion with Octahedral Germanium(IV) Hetero Atom: Synthesis, Structure, Magnetism, EPR, Electrochemistry and XPS Studies on the Mixed-Valence 14-Vanadogermanate [GeVV 12VIV 2O40]8−

Bi, Lei; Kortz, Ulrich; Dickman, Michael H.; Nellutla, Saritha; Dalal, Naresh S.; Keita, Bineta; Nadjo, Louis; Prinz, Manuel; Neumann, M.

doi:10.1007/s10876-006-0048-y

Cited by 36 publications

(31 citation statements)

References 37 publications

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“…As a result NADH (E 0 = -0.32 V vs NHE) is smoothly oxidized by all POMs, with conversion of 70-83 % in 10 h (Fig. 4) [70][71][72][73]. Moreover, Mo 10 V 2 into CS is still able to oxidize NADH (83 % conversion in 10 h).…”

Section: Antimicrobial Activitymentioning

confidence: 99%

Chitosan-Polyoxometalate Nanocomposites: Synthesis, Characterization and Application as Antimicrobial Agents

et al. 2014

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Polyoxometalates (POMs) were used, together with chitosan (CS), to obtain hybrid nanoaggregates. Three representative POMs were efficiently assembled into nanoparticles of few hundred nm diameter, featuring entangled ribbons substructure. In order to establish suitable preparation and stability conditions, the assemblies were characterized in solution by UV-Vis spectroscopy, dynamic light scattering and f-potential. The nanoparticles were tested against E. coli (10 6 CFU/ ml) in aqueous solution, showing a synergic activity of the heteropolyacid H 5 PMo 10 V 2 O 40 and CS. For such components, a highly porous and antibacterial film was obtained upon lyophilisation of the colloidal mixture.

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Section: Antimicrobial Activitymentioning

confidence: 99%

Chitosan-Polyoxometalate Nanocomposites: Synthesis, Characterization and Application as Antimicrobial Agents

et al. 2014

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“…Recently we presented preliminary results on an example of a MV POM, K 2 Na 6 [GeV 14 O 40 ]·10H 2 O, [11] which contains two "extra" electrons delocalized over the POM framework. The compound contains 12 spinless V V ions and 2 S = 1/2 V IV ions.…”

Section: Introductionmentioning

confidence: 99%

Electrically Switchable Magnetic Molecules: Inducing a Magnetic Coupling by Means of an External Electric Field in a Mixed‐Valence Polyoxovanadate Cluster

Cardona‐Serra

Clemente‐Juan

Coronado

et al. 2014

Chemistry A European J

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Herein we evaluate the influence of an electric field on the coupling of two delocalized electrons in the mixed-valence polyoxometalate (POM) [GeV14 O40 ](8-) (in short V14 ) by using both a t-J model Hamiltonian and DFT calculations. In absence of an electric field the compound is paramagnetic, because the two electrons are localized on different parts of the POM. When an electric field is applied, an abrupt change of the magnetic coupling between the two delocalized electrons can be induced. Indeed, the field forces the two electrons to localize on nearest-neighbors metal centers, leading to a very strong antiferromagnetic coupling. Both theoretical approaches have led to similar results, emphasizing that the sharp spin transition induced by the electric field in the V14 system is a robust phenomenon, intramolecular in nature, and barely influenced by small changes on the external structure.

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“…[1][2][3][4][5] Exploitation of chemical principles (redox cascade, for instance) has led to the formation of unusual icosahedral isopoly and heteropolyoxometalate clusters. [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] Transcending the molecular frontier in supramolecular regime, further assembly has been achieved by the operation of a length-scale and symmetry controlled supramolecular Darwinian principle, 24 where the larger and more symmetric species is selected, for instance, the assembly of [PMo 12 O 40 @Mo 72 Fe 30 ]. 25 Here starting from a relatively small sized PMo 12 O 40 precursor in the presence of Fe 3þ , the more symmetric and rather large Mo 72 Fe 30 cluster is formed depleting the starting precursor whereas the starting PMo 12 gets encapsulated in the larger and more symmetric Mo 72 Fe 30 .…”

Section: Introductionmentioning

confidence: 99%

Competitive Self-Assembly Manifests Supramolecular Darwinism in Soft-Oxometalates

Das

Kumar

Mallick

et al. 2015

J. Mol. Eng. Mater.

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Topological transformation manifested in inorganic materials shows manifold possibilities. In our present work, we show a clear topological transformation in a soft-oxometalate (SOM) system which was formed from its polyoxometalate (POM) precursor [PMo 12 @Mo 72 Fe 30 ]. This topological transformation was observed due to time dependent competitive self-assembly of two di®erent length scale soft-oxometalate moieties formed from this two-component host-guest reaction. We characterized di®erent morphologies by scanning electron microscopy, electron dispersive scattering spectroscopy, dynamic light scattering, horizontal attenuated total re°ection-infrared spectroscopy and Raman spectroscopy. The predominant structure is selected by its size in a sort of supramolecular Darwinian competition in this process and is described here.

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Polyoxoanion with Octahedral Germanium(IV) Hetero Atom: Synthesis, Structure, Magnetism, EPR, Electrochemistry and XPS Studies on the Mixed-Valence 14-Vanadogermanate [GeVV 12VIV 2O40]8−

Cited by 36 publications

References 37 publications

Chitosan-Polyoxometalate Nanocomposites: Synthesis, Characterization and Application as Antimicrobial Agents

Chitosan-Polyoxometalate Nanocomposites: Synthesis, Characterization and Application as Antimicrobial Agents

Electrically Switchable Magnetic Molecules: Inducing a Magnetic Coupling by Means of an External Electric Field in a Mixed‐Valence Polyoxovanadate Cluster

Competitive Self-Assembly Manifests Supramolecular Darwinism in Soft-Oxometalates

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