Cardiff University | Prifysgol Caerdydd ORCA
Online Research @ Cardiff 
WelshClear Cookie - decide language by browser settings

Sterically encumbered iridium Bis(N-heterocyclic carbene) complexes: Air-stable 14-electron cations and facile degenerate C-H activation

Phillips, Nicholas, Rowles, Johnny, Kelly, Michael J., Riddlestone, Ian, Rees, Nicholas H., Dervisi, Athanasia, Fallis, Ian Andrew and Aldridge, Simon 2012. Sterically encumbered iridium Bis(N-heterocyclic carbene) complexes: Air-stable 14-electron cations and facile degenerate C-H activation. Organometallics 31 (23) , pp. 8075-8078. 10.1021/om301060h

Full text not available from this repository.

Abstract

Cationic Ir(III) systems supported by a bis(expanded NHC) framework and featuring both agostic C–H and cis alkyl/hydride ligand sets have been targeted by protonation of the corresponding bis(alkyl) hydride complexes. Remarkably, the steric shielding afforded by the NHC substituents is such that these and related putative 14-electron cations are air and moisture stable. In solution, degenerate fluxional exchange is brought about by reversible σ-bond activation within the agostic alkyl C(sp3)–H bond; a non-dissociative mechanism is implied by the activation parameters ΔH = 8.8(0.4) kcal mol–1 and ΔS = −12.2(1.7) eu.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Subjects: Q Science > QD Chemistry
Publisher: American Chemical Society
ISSN: 0276-7333
Last Modified: 04 Jun 2017 04:46
URI: http://orca.cf.ac.uk/id/eprint/44589

Citation Data

Cited 22 times in Scopus. View in Scopus. Powered By Scopus® Data

Actions (repository staff only)

Edit Item Edit Item