Titre :

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

Auteur(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]

Titre de la revue :

Crystengcomm

Nom court de la revue :

Crystengcomm

Numéro :

22

Pagination :

371-380

Date de publication :

2020-01-14

ISSN :

1466-8033

Discipline(s) HAL :

Chimie/Chimie inorganique

Résumé en anglais : [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 ...
Lire la suite >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point of view, compound 4 appears as the association of two compound 3 entities, in which the formate ligands have been replaced by an inorganic tungsten-based sub-unit, coming from the partial decomposition of the {As III W 9 O 33 } precursor.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.Lire moins >

Langue :

Anglais

Audience :

Internationale

Vulgarisation :

Non

Établissement(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

Équipe(s) de recherche :

Matériaux hybrides (MATHYB)
Ingénierie des Systèmes Polymères

Date de dépôt :

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