Journal ArticleDOI
Membranes based on "Keplerate"-type polyoxometalates: slow, passive cation transportation and creation of water microenvironment.
TLDR
A novel type of inorganic membranelike structure formed by the self-assembly of hydrophilic polyoxometalate macroanions, which creates a microscaled, relatively isolated water environment which possesses different properties from the bulk water.Abstract:
We report a novel type of inorganic membranelike structure formed by the self-assembly of hydrophilic polyoxometalate macroanions. Such nanoscaled, water-soluble macroions tend to form stable, uniform, single-layer “blackberry” structures (20−1000 nm in size) in dilute solutions via noncovalent bond interactions. Two interesting features of “Keplerate” {Mo72Fe30} blackberries are found from fluorescence studies: (1) They create a microscaled, relatively isolated water environment (containing over 3 million water molecules) which possesses different properties from the bulk water. (2) The blackberry membrane is permeable to small cations, but not to anions. The passive transport of cations across the blackberry membrane is relatively slow but does not need any carrier or additional energy.read more
Citations
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Journal ArticleDOI
Polyoxometalates: Building Blocks for Functional Nanoscale Systems
TL;DR: The possibilities of creating highly sophisticated functional hierarchical systems with multiple, interdependent, functionalities along with a critical analysis that allows the non-specialist to learn the salient features of POMs are discussed.
Journal ArticleDOI
Polyoxometallate als Bausteine für funktionelle Nanosysteme
TL;DR: In this article, a periodensystem der Polyoxometallat-Baueinheiten (POM) is presented, in which a number of aktuelle Herausforderungen beim design funktioneller Systeme auf der Basis of POM-Baubien are discussed.
Journal ArticleDOI
From linking of metal-oxide building blocks in a dynamic library to giant clusters with unique properties and towards adaptive chemistry
Achim Müller,Pierre Gouzerh +1 more
TL;DR: The present review presents the first comprehensive report of current knowledge (including synthesis aspects not discussed before) regarding the related giant metal-oxide clusters mainly of the type {Mo(57)M'(6)} (M' = Fe(III), V(IV)) (torus structure),
Journal ArticleDOI
Solution behaviors and self-assembly of polyoxometalates as models of macroions and amphiphilic polyoxometalate–organic hybrids as novel surfactants
Panchao Yin,Dong Li,Tianbo Liu +2 more
TL;DR: Large, hydrophilic polyoxoanions with high solubility in water and/or other polar solvents demonstrate unique solution behavior by self-assembling into single layer, hollow, spherical "blackberry" structures, which is obviously different from small, simple ions.
Journal ArticleDOI
Beyond Charge Balance: Counter‐Cations in Polyoxometalate Chemistry
TL;DR: How application‐inspired research has exploited cation‐controlled design to discover new POM materials has led to the quest for fundamental understanding of POM–cation interactions is explored.
References
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Journal ArticleDOI
Self-assembly in aqueous solution of wheel-shaped Mo154 oxide clusters into vesicles.
TL;DR: This work believes the polyoxomolybdate-based vesicles form owing to a subtle interplay between short-range van der Waals attraction and long-range electrostatic repulsion, with important further stabilization arising from hydrogen bonding involving water molecules encapsulated between the wheel-shaped clusters and in the vesicle interior.
Journal ArticleDOI
Archimedean synthesis and magic numbers: "Sizing" giant molybdenum-oxide-based molecular spheres of the Keplerate type
Achim Müller,Sabyasachi Sarkar,Syed Qaiser Nazir Shah,Hartmut Bögge,Marc Schmidtmann,Shatarupa Sarkar,Paul Kögerler,Björn Hauptfleisch,Alfred X. Trautwein,Volker Schünemann +9 more
TL;DR: Pythagorean harmony can be found in the spherical polyoxometalate clusters described here, since there are interesting relationships between the so-called magic numbers relevant for spherical viruses and the number of the building blocks in the cluster.
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Membrane chloride transport measured using a chloride-sensitive fluorescent probe.
TL;DR: Chloride transport determined with SPQ was validated by measurement of erythrocyte chloride/anion exchange and membrane vesicle chloride conductance.
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Kinetics of transport of divalent cations across sarcoplasmic reticulum vesicles induced by ionophores.
TL;DR: An explanation for the discrepancy between the effectiveness of the antibiotics in the two phase system and the transport rates in sarcoplasmic reticulum is provided by the observation of a particularly low affinity of X537A for Ca++ and Sr++ in polar media.
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Density Fluctuations Under Confinement: When Is a Fluid Not a Fluid?
TL;DR: Measurements obtained with an extended surface forces apparatus are reported, which makes use of fast spectral correlation to gain insight into the behavior of a thin film of cyclohexane confined within attoliter volumes, with simultaneous measurement of film thickness and refractive index.