Fluorotungstates of the metatungstate family: identification and properties of one compound of the 2-18 series

Chauveau, F.; Doppelt, P.; Lefèbvre, J.

doi:10.1021/ic50211a062

Cited by 27 publications

(13 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Synthesis of the quasi‐Wells–Dawson polyfluoroxometalate compound Na 7 [H 2 F 6 NaW 18 O 56 ] (Figure b) is an example of a chemical self‐assembly reaction in which reactant molecules containing one tungsten atom assemble into Na 7 [H 2 F 6 NaW 18 O 56 ], which contains 18 tungsten atoms. The synthesis reported in the literature is based on the acidification of an aqueous solution of Na 2 WO 4 with a mixture of HF and HCl . An alternative synthesis developed for this project is based on initiating the self‐assembly reaction by defluorination of Na 2 WO 2 F 4 with SiO 2 with co‐formation of insoluble Na 2 SiF 6 .…”

Section: Resultsmentioning

confidence: 99%

“…Polyoxometalates are a large class of discreet polyanionic compounds consisting of 6–368 metal atoms, typically W, Mo, or V in their highest oxidation states, bridged by oxygen atoms . In some cases, fluoride may substitute some of the oxygen atoms in a subclass called polyfluoroxometalates . It has been shown that at high concentrations polyoxometalate molecules assemble into colloids .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Self‐Assembly through Noncovalent Preorganization of Reactants: Explaining the Formation of a Polyfluoroxometalate

Schreiber

Avram

Neumann

2017

Chemistry A European J

View full text Add to dashboard Cite

High-order elementary reactions in homogeneous solutions involving more than two molecules are statistically improbable and very slow to proceed. They are not generally considered in classical transition-state or collision theories. Yet, rather selective, high-yield product formation is common in self-assembly processes that require many reaction steps. On the basis of recent observations of crystallization as well as reactions in dense phases, it is shown that self-assembly can occur by preorganization of reactants in a noncovalent supramolecular assembly, whereby directing forces can lead to an apparent one-step transformation of multiple reactants. A simple and general kinetic model for multiple reactant transformation in a dense phase that can account for many-bodied transformations was developed. Furthermore, the self-assembly of polyfluoroxometalate anion [H F NaW O ] from simple tungstate Na WO F was demonstrated by using 2D F- F NOESY, 2D F- F COSY NMR spectroscopy, a new 2D F{ W} NMR technique, as well as ESI-MS and diffusion NMR spectroscopy, and the crucial involvement of a supramolecular assembly was found. The deterministic kinetic reaction model explains the reaction in a dense phase and supports the suggested self-assembly mechanism. Reactions in dense phases may be of general importance in understanding other self-assembly reactions.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Self‐Assembly through Noncovalent Preorganization of Reactants: Explaining the Formation of a Polyfluoroxometalate

Schreiber

Avram

Neumann

2017

Chemistry A European J

View full text Add to dashboard Cite

show abstract

“…W: gray, M – substituted transition metal, Na: yellow, F: green, O: red. Not shown are the counter cations, solvent water and two H atoms in apical positions within the structure as previously discussed …”

Section: Resultsmentioning

confidence: 99%

“…Known compounds include polyfluoroxomolybdates, fluorine containing Keplerates, polyfluoroxovanadates, and Keggin metatungstate structures with internal fluorine atoms replacing oxygen atoms . In addition, a fluorinated polyoxoanion, [H 2 F 6 NaW 18 O 56 ] 7– , that has a Wells–Dawson shell (an elliptic compound consisting of 18 tungsten atoms) and a prismatic {NaF 6 } core has been prepared . For the latter polyfluoroxometalate compounds it is possible to prepare transition metal substituted compounds having such quasi Wells–Dawson structures .…”

Section: Introductionmentioning

confidence: 99%

Reversible Temperature Dependent Dimerization of Transition Metal Substituted Quasi Wells–Dawson Polyfluoroxometalates

et al. 2018

View full text Add to dashboard Cite

Polyfluoroxometalates (PFOMs) that have a quasi Wells-Dawson structure and have low valent transition metal substitution at the so-called "belt" position, α 1 -[H 2 F 6 NaM-(H 2 O)W 17 O 55 ] q-, can reversibly interchange between dimeric and monomeric structures. The dimers have two unique M-μO-W bridges between two PFOM units. The dimerization occurs through dehydration and was studied as a function of temperature using the visible spectrum that is sensitive to the wavelength and extinction coefficient of the d-d transition. The [a]

show abstract

“…No hyperfine Hamiltonian, equation (l), where x , y, and z refer to the main 3 ? = gxPHxSx 4-gyPHySy 4g,PH,Sz (1) axis of the rhombic g tensor. The magnetic parameters are obtained by computer simulation with a Gaussian lineshape [Figure 3(b)], and are reported in Table 2.…”

Section: Resultsmentioning

confidence: 99%

Mixed-valence fluoropolytungstates

Sánchez¹,

Livage²,

Doppelt³

et al. 1982

J. Chem. Soc., Dalton Trans.

Self Cite

View full text Add to dashboard Cite

show abstract

Fluorotungstates of the metatungstate family: identification and properties of one compound of the 2-18 series

Cited by 27 publications

References 3 publications

Self‐Assembly through Noncovalent Preorganization of Reactants: Explaining the Formation of a Polyfluoroxometalate

Self‐Assembly through Noncovalent Preorganization of Reactants: Explaining the Formation of a Polyfluoroxometalate

Reversible Temperature Dependent Dimerization of Transition Metal Substituted Quasi Wells–Dawson Polyfluoroxometalates

Mixed-valence fluoropolytungstates

Contact Info

Product

Resources

About