Solvent mediated reversible solid state photochromism of {Mo₇₂Fe₃₀} Keplerate

Abstract

When the yellow rhombhohedral crystals of Keplerate [Mo72Fe30O252(CH3COO)12{Mo2O7(H2O)}2{H2Mo2O8(H2O)}(H2O)91]·150H2O (1), on wetting with N,N-dimethylformamide (DMF), are irradiated with sunlight, it show remarkable reversible solid state photochromic behaviour with the formation of...

Polyoxometalate-based frameworks as chemical nanoreactors: in situ synthesis of active silver nanoparticles in confined spaces

“…6, top). 37,38 The formation of Ag NPs was not observed under this condition. Furthermore, the oxidation-induced fading of the blue coloration of 1 by aerial oxygen was observed within hours.…”

“…Supriya et al extensively investigated the effect of DMF molecules on the photochromic activity of POMs and elucidated the mechanism in 2018 37 and 2021. 38 The electron transfer from a donor (DMF) to an acceptor (POM), which forms electron donor–acceptor (EDA) complexes, brings about a color change from colorless to blue. Therefore, the rapid response of 1 and 2 to light is attributed to the incorporation of DMF molecules.…”

Visible‐Light Photochromism of Polyoxometallate H4PMo11VO40 Composite Film Based on Polyvinylpyrrolidone with a Fast Response

“…The application of visible photochromic materials has greater significance. Therefore, in recent years, visible light heteropoly acid based photochromic materials have been widely studied [14–18] …”

Nanoblackberries of {W72Fe33} and {Mo72Fe30}: Electrocatalytic Water Reduction

“…Thus, we were very keen to investigate whether such an inexpensive and instantly isolated nanomaterial had some meaningful applications. In the meantime, Rezaeifard, Jafarpour, and their co-workers from the Catalysis Research Laboratory of University of Birjand have shown that this amorphous nanomaterial {Mo 72 Fe 30 } NM is quite superior to crystalline {Mo 72 Fe 30 } cryst as far as the photocatalytic performances toward the degradation of organic dyes and a catalase like activity, including an aerobic synthesis of benzimidazoles, are concerned. − Recently, Supriya and co-workers performed proton conductivity studies on {Mo 72 Fe 30 } cryst , and they have even extended their studies to determine the photochromism properties of the {Mo 72 Fe 30 }-type keplerate. , In the last several years, we have been working on electrocatalytic water splitting, , an important and contemporary research goal at the moment worldwide (due to the energy crisis issue on our planet Earth). Since this amorphous substance, Na 2 [Mo 72 Fe 30 O 252 ­(CH 3 COO) 4 ­(OH) 16 ­(H 2 O) 108 ]·180H 2 O ({ Mo 72 Fe 30 } NM ), is water insoluble, having 16 hydroxyl groups per {Mo 72 Fe 30 } cluster, in contrast to its crystalline analogue, [Mo 72 Fe 30 O 252 ­(CH 3 COO) 12 ­{Mo 2 O 7 (H 2 O)} 2 ­{H 2 Mo 2 O 8 (H 2 O)}­(H 2 O) 91 ]·150H 2 O ( {Mo 72 Fe 30 } cryst ) and the Müller group established that a guest-free {Mo 72 Fe 30 } cluster cage can be reduced by two electrons that are delocalized over 72 Mo ions on the cage surface retaining its structural integrity, the substance {Mo 72 Fe 30 } NM has the potential to act as a heterogeneous electrocatalyst for water reduction to yield molecular hydrogen.…”

“…18−20 Recently, Supriya and co-workers performed proton conductivity studies on {Mo 72 Fe 30 } cryst , and they have even extended their studies to determine the photochromism properties of the {Mo 72 Fe 30 }-type keplerate. 21,22 In the last several years, we have been working on electrocatalytic water splitting, 23,24 an important and contemporary research goal at the moment worldwide (due to the energy crisis issue on our planet Earth). Since this amorphous substance, Na cluster cage can be reduced by two electrons that are delocalized over 72 Mo ions on the cage surface retaining its structural integrity, 25 the substance {Mo 72 Fe 30 } NM has the potential to act as a heterogeneous electrocatalyst for water reduction to yield molecular hydrogen.…”