Study of the stability of solid polyoxometalate Mo72Fe30 with a buckyball structure

Interaction between nanocluster polyoxometallates and low-molecular-weight organic compounds

“…The shape of the isotherm for Mo 72 Fe 30 is likely related to its instability in organic solvents, unlike the two other polyoxometallates. In [21], we pointed out the properties of the destruction of the POM Mo 72 Fe 30 under the action of organic compound vapors.…”

“…As the relative pressure increases, however, the steps gradually smoothen and the curves approach the shape typical of Fick's diffusion. The stepped sorption could be associated with the complicated structure of the POM, the presence of nonequivalent mounting areas for sorbed molecules, different degrees of their accessibility [21], or the possibility of sorption by both the external keplerate sur-face and the penetration of molecules into the internal cavity [8]. The possibility of sorbate molecules interacting with one another cannot be excluded, as they accumulate to form the corresponding clusters of organic compounds on the POM surfaces.…”

Solvent mediated reversible solid state photochromism of {Mo72Fe30} Keplerate

“…The room temperature ESR spectrum for the parent compound 1 shows a broad peak, centred at g ∼ 2 due to the presence of Fe 3+ ions. 46 On the contrary, the ESR spectrum (Fig. 1) for compound 1 red shows a sharp single peak centred at g = 1.98, characteristic of 4d 1 Mo 5+ ions (S = 1 2 ; I = 0 for 98 Mo and I = 5/2 for 95 Mo and 97 Mo).…”

“…1) for compound 1 red shows a sharp single peak centred at g = 1.98, characteristic of 4d 1 Mo 5+ ions (S = 1 2 ; I = 0 for 98 Mo and I = 5/2 for 95 Mo and 97 Mo). [46][47][48] A careful look at the ESR spectrum of 1 red shows the weak six line features of 95 Mo and 97 Mo isotopes. This confirms the presence of some Mo(V) centres in compound 1 red as opposed to all-Mo(VI) centres in compound 1, which is ESR inactive.…”

Physicochemical and biochemical properties of the Keplerate-type nanocluster polyoxomolybdates as promising components for biomedical use

“…This property can be useful for POM removal from the body after the function of bioactive substances delivery has been performed. The results of studies of thermal stability and destruction of the Keplerate and toroidal type POMs in the solid state using spectroscopic methods are given in [280][281][282][283][284][285][286]. At the same time, it was shown that a thorough spectroscopic analysis and a comprehensive interpretation of the results are necessary [280,286] in order to avoid unreliable conclusions [284] about the POMs' thermal stability.…”