Title :

Influence of ph on ce-iv-[(asw9o33)-w-iii](9-) association for the formation of hexanuclear cerium(iv) oxo-hydroxo-clusters stabilized by trivacant polyanions

Author(s) :

Dufaye, Maxime [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Duval, Sylvain [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Stoclet, Gregory [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Loiseau, Thierry [Auteur]

Journal title :

Crystengcomm

Abbreviated title :

Crystengcomm

Volume number :

22

Pages :

371-380

Publication date :

2020-01-14

ISSN :

1466-8033

HAL domain(s) :

Chimie/Chimie inorganique

English abstract : [en]

Four hetero-polyoxometalate compounds were obtained in aqueous solution, following the synthetic combination of Na 9 [B--As III W 9 O 33 ] with the 4f tetravalent cerium cation, in the presence of formate ligand at different ...
Show more >Four hetero-polyoxometalate compounds were obtained in aqueous solution, following the synthetic combination of Na 9 [B--As III W 9 O 33 ] with the 4f tetravalent cerium cation, in the presence of formate ligand at different pH values (ranging from 1.5 to 6). Each of these four molecules [{Ce 6 (µ 3-O) 4 (µ 3-OH) 4 (HCOO) 3,5 } 4 (As III W 9 O 33) 4 ] 2-compound 1, [(Ce 6 (µ 3-O) 4 (µ 3-OH) 4)(H 2 O) 4 (As III W 9 O 33)(HCOO) 9 ] 6-compound 2, [(Ce 6 (µ 4-O) 3 (µ 3-O) 5 (µ 2-H 2 O) 3 (HCOO) 3 (As V W 9 O 34) 3 ] 22-compound 3 and [(W 4 O 10){(Ce 6 (µ 3-O) 5 (µ 4-O) 3 (µ 2-H 2 O))(As V W 9 O 34) 3 } 2 ] 44-compound 4 are constructed around one to four hexanuclear cerium clusters of [Ce 6 O 8 ] type. For the compounds 1-3, the arsenato-polytungstate POM units and formate ligands are associated and participate in the stabilization of one cerium(IV)-bearing hexanuclear unit in a cyclic motif (1), a monomeric POM species for 2, and a trimeric POM species for 3. However, in the last molecular system (4), only inorganic entities are bonded to the hexameric cerium(IV) clusters. From the structural point of view, compound 4 appears as the association of two compound 3 entities, in which the formate ligands have been replaced by an inorganic tungsten-based sub-unit, coming from the partial decomposition of the {As III W 9 O 33 } precursor. The behavior and the association modes of the four molecular species are explained on the basis of the pH variation used for their syntheses. All four compounds have been characterized by single-crystal X-ray diffraction, IR spectroscopy, TGA and SEM/EDX microscopy and ICP analyses. Solution behavior was assessed on compound 3 by using Small Angle X-ray Scattering (SAXS) measurements.Show less >

Language :

Anglais

Audience :

Internationale

Popular science :

Non

Administrative institution(s) :

CNRS
Centrale Lille
ENSCL
INRA
Univ. Artois
Université de Lille

Collections :

• Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
• Unité Matériaux et Transformations (UMET) - UMR 8207

Research team(s) :

Matériaux hybrides (MATHYB)
Ingénierie des Systèmes Polymères

Submission date :

2022-03-02T07:13:35Z
2023-12-19T16:37:41Z