Heterolytic activation of hydrogen using frustrated Lewis pairs containing tris(2,2 ',2 ''-perfluorobiphenyl)borane

Samantha C. Binding, Hasna Zaher, F. Mark Chadwick, Dermot O'Hare*

*Corresponding author for this work

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

The extremely sterically hindered borane tris(2,2′,2″- perfluorobiphenyl)borane (PBB) has been structurally characterised. In combination with bulky nitrogen bases, it forms the 'frustrated Lewis pairs' (FLPs) PBB/2,2,6,6-tetramethylpiperidine (TMP) (1), PBB/1,4-diazobicyclo[2.2.2]- octane (DABCO) (2) and PBB/2,6-lutidine (lut) (3). These novel, unquenched acid-base pairs have been shown to effect facile room temperature heterolytic cleavage of dihydrogen to form the ammonium borate salts [2,2,6,6-Me 4C5H6NH2][HB(C12F 9)3] (4) and [N(C2H4) 3NH][HB(C12F9)3] (5), and lutidinium borate [2,6-Me2C5H3NH][HB(C12F 9)3] (6). Although these reactions are equilibria, the reverse reaction and release of hydrogen gas was not apparent at temperatures up to 120 °C. The relative Lewis acidity of PBB has been determined using the Gutmann-Beckett method.

Original languageEnglish
Pages (from-to)9061-9066
Number of pages6
JournalDalton Transactions
Volume41
Issue number30
DOIs
Publication statusPublished - 14 Aug 2012

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