Titre :

Solid-State NMR Investigations of the Immobilization of a BF4- Salt of a Palladium(II) Complex on Silica

Auteur(s) :

Wiench, Jerzy W. [Auteur]
Ames Laboratory [Ames, USA]
Michon, Christophe [Auteur]
Ames Laboratory [Ames, USA]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Ellern, Arkady [Auteur]
Iowa State University [ISU]
Hazendonk, Paul [Auteur]
University of Lethbridge
Iuga, Adriana [Auteur]
University of Lethbridge
Angelici, Robert J. [Auteur]
Iowa State University [ISU]
Ames Laboratory [Ames, USA]
Pruski, Marek [Auteur]
Iowa State University [ISU]
Ames Laboratory [Ames, USA]

Titre de la revue :

Journal of the American Chemical Society

Nom court de la revue :

J. Am. Chem. Soc.

Numéro :

131

Pagination :

11801-11810

Date de publication :

2009-08-03

ISSN :

0002-7863

Discipline(s) HAL :

Chimie

Résumé en anglais : [en]

The structure of the silica supported palladium(II) complex [Pd(dppp)(S2C-NEt2)]BF4 (abbreviated as [Pd(dppp)(dtc)]BF4, where dppp is Ph2P(CH2)3PPh2) and interactions between the [Pd(dppp)(dtc)]+ cation, the BF4− anion, ...
Lire la suite >The structure of the silica supported palladium(II) complex [Pd(dppp)(S2C-NEt2)]BF4 (abbreviated as [Pd(dppp)(dtc)]BF4, where dppp is Ph2P(CH2)3PPh2) and interactions between the [Pd(dppp)(dtc)]+ cation, the BF4− anion, and the silica surface are studied using solid-state NMR spectroscopy. The unsupported, crystalline form of [Pd(dppp)(dtc)]BF4 is also investigated, both by X-ray diffraction and NMR. The structures of the cation and anion are found to be essentially the same in both unsupported and supported complex. The [Pd(dppp)(dtc)]BF4 loading has been determined by quantitative measurements of 11B, 19F, and 31P intensities, whereas the arrangement of anions and cations on the surface of silica has been established by two-dimensional heteronuclear correlation experiments involving 1H, 11B, 13C, 19F, 29Si, and 31P nuclei. At low coverages, the [Pd(dppp)(dtc)]+ cations are located near the BF4− anions, which in turn are immobilized directly on the surface near the Q4 sites. At higher loadings, which in this study corresponded to 0.06−0.15 mmol/g, the complexes stack on top of each other, despite the fact that the directly adsorbed molecules take up less than 10% of the silica surface. The relevance of these findings to heterogeneous catalysis is discussed.Lire moins >

Langue :

Anglais

Audience :

Internationale

Vulgarisation :

Non

Établissement(s) :

Université de Lille
CNRS
Centrale Lille
ENSCL
Univ. Artois

Collections :

• Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181

Date de dépôt :

2023-05-30T18:02:07Z
2024-04-25T09:32:49Z