Normal and abnormal NHC coordination in cationic hydride iodide complexes of aluminium

Michael Trose, Stuart Burnett, Simon J. Bonyhady, Cameron Jones, David B. Cordes, Alexandra M. Z. Slawin, Andreas Stasch

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

The mixed N-heterocyclic carbene (NHC) complexes NHCAlHxI3-x, where NHC is IDip or IMes ((HCNAr)2C:, Ar = 2,6-iPr2C6H3 = Dip (IDip); or 2,4,6-Me3C6H2 = Mes (IMes)), x = 1 or 2, were either prepared from NHCAlH3 and NHCAlI3 or by halogenation of NHCAlH3 with MeI. Reaction of [(IDip)AlHxI3-x], with x = 0-3, with another equivalent of a IDip afforded either fluxional equilibria in benzene solution for x = 0, no reaction for x = 3, or the new mixed normal-abnormal NHC-coordinated ionic complexes [(IDip)AlH2(aIDip)]I (9) and [(IDip)AlHI(aIDip)]I (10), where aIDip is the abnormal IDip carbene tautomer bonded through its 4-position. The molecular structures of 9 and 10 were determined and show slightly shorter Al–C(aIDip) than Al–C(IDip) distances. In addition, a complex containing [(IDip)AlI2(aIDip)]I (11) was structurally characterized though could not intentionally be synthesised. Possible formation mechanisms for 9-11 are discussed and the normal and abnormal IDip coordination to the aluminium(III) centre is believed to occur for steric reasons.
Original languageEnglish
JournalDalton Transactions
VolumeIn press
Early online date11 Jul 2018
DOIs
Publication statusE-pub ahead of print - 11 Jul 2018

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