Reactions of phosphinites with oxide surfaces

A new method for anchoring organic and organometallic complexes

Brian C. Vicente, Zheng Huang, Maurice Brookhart, Alan S Goldman, Susannah L. Scott

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

When a pincer-ligated iridium complex with a phosphinite substituent in the para-position of the aromatic backbone is immobilized on γ-alumina, it becomes a highly effective supported catalyst for the transfer-dehydrogenation of alkanes. The nature of the interaction between the organometallic complex and the support was investigated using solid-state 31P MAS NMR spectroscopy, solution-state 1H and 31P{1H} NMR spectroscopy, IR and GC/MS analysis of extracted reaction products. The phosphinite substituent is cleaved from the pincer ligand by its reaction with hydroxyl groups on the γ-alumina surface, resulting in covalent anchoring of the complex via the aryl ring. A similar reaction occurs on silica, allowing for ready grafting onto this support as well. A strategy for anchoring homogeneous catalysts on hydroxyl-terminated oxide supports though the selective cleavage of [POR]-containing ligand substituents is suggested.

Original languageEnglish
Pages (from-to)4268-4274
Number of pages7
JournalDalton Transactions
Volume40
Issue number16
DOIs
Publication statusPublished - Apr 28 2011

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Aluminum Oxide
Organometallics
Catalyst supports
Hydroxyl Radical
Oxides
Nuclear magnetic resonance spectroscopy
Ligands
Iridium
Alkanes
Dehydrogenation
Reaction products
Silicon Dioxide
Catalysts

ASJC Scopus subject areas

  • Inorganic Chemistry

Cite this

Reactions of phosphinites with oxide surfaces : A new method for anchoring organic and organometallic complexes. / Vicente, Brian C.; Huang, Zheng; Brookhart, Maurice; Goldman, Alan S; Scott, Susannah L.

In: Dalton Transactions, Vol. 40, No. 16, 28.04.2011, p. 4268-4274.

Research output: Contribution to journalArticle

Vicente, Brian C. ; Huang, Zheng ; Brookhart, Maurice ; Goldman, Alan S ; Scott, Susannah L. / Reactions of phosphinites with oxide surfaces : A new method for anchoring organic and organometallic complexes. In: Dalton Transactions. 2011 ; Vol. 40, No. 16. pp. 4268-4274.
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