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

13 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

ASJC Scopus subject areas

  • Inorganic Chemistry

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