Polyoxo Anions: Synthesis and Structure

Pope, Michael T.

doi:10.1016/b978-0-12-409547-2.01043-x

Cited by 17 publications

(13 citation statements)

References 426 publications

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“…POMs are synthetic, early transition, metal–oxygen clusters (Pope, ; Pope and Müller, ) known for nearly 200 years (Berzelius, ). According to their chemical composition, POMs are classified as isopolyanions ((M m O y ) p– ) and heteropolyanions ((X x M m O y ) q– ), in which, alongside metal M (most commonly V, Mo or W, and sometimes Nb or Ta), 65 other elements could be present as X heteroatom (P, Si, Ge, Sb, etc.)…”

Section: Introductionmentioning

confidence: 99%

Differentiation of stem cells into insulin‐producing cells under the influence of nanostructural polyoxometalates

Bâlici

Şuşman

Rusu

et al. 2015

J of Applied Toxicology

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Two polyoxometalates (POMs) with W were synthesized by a two-step, self-assembling method. They were used for stimulation of mesenchymal stem cell differentiation into insulin-producing cells. The nanocompounds (tris(vanadyl)-substituted tungsto-antimonate(III) anions [POM1] and tris-butyltin-21-tungsto-9-antimonate(III) anions [POM2]) were characterized by analytical techniques, including ultraviolet-visible, Fourier transform infrared, nuclear magnetic resonance spectroscopy, and transmission electron microscopy. We found that these polyoxotungstates, with 2-4 nm diameters, did not present toxic effects at the tested concentrations. In vitro, POM1 stimulated differentiation of a greater number of dithizone-positive cells (also organized in clusters) than the second nanocompound (POM2). Based on our in vitro studies, we have concluded that both the POMs tested had significant biological activity acting as active stimuli for differentiation of stem cells into insulin-producing cells. Copyright

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Section: Introductionmentioning

confidence: 99%

Differentiation of stem cells into insulin‐producing cells under the influence of nanostructural polyoxometalates

Bâlici

Şuşman

Rusu

et al. 2015

J of Applied Toxicology

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“…Though polyoxometalates have been touted as homogeneous models for bulk metal oxides, investigations into the parallel reactivity of the molecules and materials have focused primarily on the photophysical and electronic consequences of heterometal incorporation (“dopants”). − Vacancy formation in these metal-oxide clusters has traditionally been relegated to the removal of an entire [MO x ] n − subunit, resulting in the generation of a lacunary structure. , Accessing an oxygen atom vacancy in the homometallic POV-alkoxide cluster represents the first example of the cleavage of a single MO bond at the surface of a polyoxometalate. Discovery of this type of chemical reactivity for metal-oxide clusters opens the possibility of using polyoxometalates as molecular models for in situ surface defect formation during catalysis with RMOs.…”

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confidence: 99%

Oxygen-Atom Vacancy Formation at Polyoxovanadate Clusters: Homogeneous Models for Reducible Metal Oxides

2018

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We report the first example of oxygen-atom vacancy formation at the surface of a polyoxometalate, highlighting the ability of a polyoxovanadate-alkoxide cluster, [VO(OCH)], to function as a homogeneous model for reducible metal oxides. The removal of an oxide ion from [VO(OCH)] results in the formation of a reactive vanadium(III) cation within the multimetallic framework. Generation of [VO(OCH)] is confirmed by H NMR, infrared and electronic absorption spectroscopies, as well as electrospray ionization mass spectrometry. The consequences of oxygen atom removal on the electrochemical profile of the assembly are assessed, revealing that stabilization of the reduced cluster is achieved through delocalized electron density. The oxygen-atom vacancy permits activation of O, demonstrating the ability of polyoxovanadate-alkoxide clusters to serve as both structural and functional models of reducible metal oxides.

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“…Polyoxometalates are useful in catalysis and other applications owing to their redox potentials, acidities, polarities, negative charge densities on surface oxygens and other parameters (Hill, 1998 ; Wang and Yang, 2015 ). Several reviews can be consulted for early studies of fundamental structure and reactivity (Pope, 1983 , 2004 ; Hill, 2004 ; Yamase and Pope, 2006 ; Wang and Yang, 2015 ). The polyanion can be extensively modified by substitution of surface metal-oxo units (addenda or surface metal-oxo units) with many first-row transition-metal and other redox-active metal ions as well as organometallic groups.…”

Section: Pom Properties That Make Them Effective In Materials Applicamentioning

confidence: 99%

Multi-Tasking POM Systems

et al. 2018

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Polyoxometalate (POM)-based materials of current interest are summarized, and specific types of POM-containing systems are described in which material facilitates multiple complex interactions or catalytic processes. We specifically highlight POM-containing multi-hydrogen-bonding polymers that form gels upon exposure to select organic liquids and simultaneously catalyze hydrolytic or oxidative decontamination, as well as water oxidation catalysts (WOCs) that can be interfaced with light-absorbing photoelectrode materials for photoelectrocatalytic water splitting.

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Polyoxo Anions: Synthesis and Structure

Cited by 17 publications

References 426 publications

Differentiation of stem cells into insulin‐producing cells under the influence of nanostructural polyoxometalates

Differentiation of stem cells into insulin‐producing cells under the influence of nanostructural polyoxometalates

Oxygen-Atom Vacancy Formation at Polyoxovanadate Clusters: Homogeneous Models for Reducible Metal Oxides

Multi-Tasking POM Systems

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