The title polyoxometalate-based organic-inorganic hybrid compound, (C(5)H(10)NO(2))(5)[BW(12)O(40)]·3H(2)O, consists of one α-Keggin-type [BW(12)O(40)](5-) polyoxoanion, five crystallographically independent l-prolinium cations and three uncoordin-ated water mol-ecules. The polyoxoanion shows characteristic features with respect to bond lengths and angles. Several N-H⋯O and O-H⋯O hydrogen bonds...

In the asymmetric unit of the title salt, (C(5)H(12)NO)(6)[PMo(12)O(40)](2)·5C(5)H(11)NO, there are two independent α-Keggin-type [PMo(12)O(40)](3-) polyoxidoanions, which show characteristic features with respect to bond lengths and angles. One of the [CH(3)CH(2)C(=OH)N(CH(3))(2)](+) cations is hydrogen bonded to the neighboring polyoxidoanion through a C=O-H⋯O(bridge) hydrogen bond. The organ...

In the work reported in this paper, we demonstrate that Ag–Keggin ion colloidal particles are excellent templates for the synthesis of organized assemblies of silver nanoparticles, wherein the Keggin ion host plays the role of a UV-switchable reducing agent. More specifically, we investigate the formation of aqueous colloidal particles of Ag ions complexed with phosphotungstate (PW12O40) 32 Keg...

Partial hydrolysis of AlCl3 with Ca(OH)2 and the amino acid glycine enables the selective transformation of the Al13 Keggin structures, outlining the ε → δ → γ isomerization process. Through this, a new γ-Al13 Keggin structure was able to be isolated and characterized through (27)Al NMR and single-crystal XRD.

Six new compounds [(CpTi)X, Cp=upsilon(nabla)-c(nabla)H(nabla), X=Ge, Ga, B) have been prepared and their Keggin structures determined by elementary analysis, IR, UV, (infinity)H NMR and (infinity for all)WNMR spectrometry. The results show that the complexes retain Keggin structure. The complexes exhibit antitumoral activity in vitro as shown by MTT experiment.

In this research, spherical α-Fe2O3 nanoparticles (NPs) were supported on the surface of 12-tungstosilicic acid (12-TSA.7H2O) as a catalyst support, using two different Forced Hydrolysis and Reflux Condensation (FHRC) and Solid-State Dispersion (SSD) methods. α-Fe2O3 and 12-TSA.7H2O were synthesized due to previous reports. A...

Abstract Two tungstates containing platinum nanoparticles (Pt Npts) were obtained by air-calcining α-Keggin-type diplatinum(II)-coordinated polyoxotungstates, Cs 3 [α-PW 11 O 39 { cis -Pt(NH ) 2 } ]⋅8H ( Cs-P-Pt and 4 [α-SiW ]⋅11H Cs-Si-Pt ), at 700–900 °C for 5 h. The polyoxotungstate was transformed to a mixture of Pt Npts PW 12 40 upon calcination, while the structures W 35 . generated 700 h...

HeteroPolyAcids (HPA's) are a class of solid acids that have broad applications in many fields of science and technology, including catalysis and chemical engineering. The proton locations within the thermally stable and commonly known Keggin unit, which is the primary structure building unit/block, has remained undetermined in anhydrous HPAs, despite numerous theoretical and experimental effor...

The design and assembly of metal-organic complexes (MOCs) have attracted considerable attention, because of their diverse topologies and potential applications in areas such as catalysis and materials science [1 – 6]. Polyoxometalates (POMs), as a unique class of inorganic metal oxide clusters, have been regarded as excellent candidates to obtain MOCs due to their controllable shapes and sizes,...