Lanthanide Carbene Halides through Protonolysis of Ln−N Bonds by Imidazolium Salts: Synthesis and Structure of Salicylaldiminato-Functionalized N-Heterocyclic Carbene Lanthanide Bromides

The three salicylaldiminato-functionalized N-heterocyclic carbene lanthanide bromides L2LnBr (Ln = Nd (2), Sm (3), Er (4); L = [3,5-tBu2-2-(O)C6H2CHNCH2CH2(C{NCHCHNiPr})]) with early to late lanthanide metals were conveniently synthesized in moderate yields by a protonolysis strategy via the direct reaction of LiLn(NiPr2)4 with [H2L]Br (1). All complexes were characterized by X-ray crystal determinations.