In contrast to the ubiquitous nature of five membered ring N-heterocyclic carbene (NHC) ligands in transition metal chemistry, there have been fewer studies into the corresponding larger six and seven membered ring counterparts. These so called ring expanded NHCs are more basic and sterically encumbered, offering opportunities to stabilise metal centres with unusual oxidation states and geometries.We have recently reported that combining Ni(0) and Ni(II) precursors in the presence of the bulky six membered NHC (6Mes) gave the three coordinate Ni(I) complex, Ni(6Mes)(PPh3)Br. This poster reports the synthesis and characterisation (including EPR and ENDOR studies) of this complex and a series of new derivatives, along with preliminary studies of these Ni(I) species in stoichiometric and catalytic transformations.

Ring expanded N-heterocyclic carbene complexes of Ni(I)

244th National Meeting (2012)

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