Mixed Organic Counterion Strategy Modulates the Self-Assembly of Polyoxometalate Hybrids into Toroids and Affects Their Photochromic and Photocatalytic Properties.

A series of five mixed-counterion polyoxometalate (POM) hybrids have been developed starting from the [SiWO] cluster and two different aryl sulfonium counterions (ASCIs), (4-hydroxyphenyl)dimethylsulfonium (HPDS) and (4-formylphenyl)dimethylsulfonium (FPDS), bearing different functional groups -OH and -CHO, respectively. The HPDS/FPDS counterion ratio in hybrids varied as 4:0 (), 3:1 (), 2:2 (), 1:3 (), and 0:4 (), and it resulted in a morphological transition of the self-assembly of these hybrids. Hybrid exhibited spherical self-assembly, while hybrid exhibited large toroidal self-assembly predominantly.

Post-functionalization through covalent modification of organic counter ions: a stepwise and controlled approach for novel hybrid polyoxometalate materials.

Post-functionalization of Class I type polyoxometalate-organic hybrids through covalent modification of the organic counter ions in a step-wise and controlled manner is reported for the first time. The properties of the post-functionalized hybrids have been studied and compared with those of their parent hybrids revealing marked differences in properties.

Efficient Electrocatalytic Water Oxidation by Fe(salen)-MOF Composite: Effect of Modified Microenvironment.

An efficient and robust heterogeneous electrocatalyst, ((Fe-(salen)(OH) + H[SiWO]·HCl)@ZIF-8) for oxygen evolution reaction (OER) at the neutral pH, was developed by coencapsulation of Fe-salen (i.e., Fe(salen)Cl) and SiW (i.

A Keggin Polyoxometalate Shows Water Oxidation Activity at Neutral pH: POM@ZIF-8, an Efficient and Robust Electrocatalyst.

Keggin-type polyoxometalate anions [XM O ] are versatile, as their applications in interdisciplinary areas show. The Keggin anion [CoW O ] turns into an efficient and robust electrocatalyst upon its confinement in the well-defined void space of ZIF-8, a metal-organic framework (MOF). [H CoW O ]@ZIF-8 is so stable to water oxidation that it retains its initial activity even after 1000 catalytic cycles.