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 L<sub>2</sub>LnBr (Ln =<i></i> Nd (<b>2</b>), Sm (<b>3</b>), Er (<b>4</b>); L = [3,5-<sup><i>t</i></sup>Bu<sub>2</sub>-2-(O)C<sub>6</sub>H<sub>2</sub>CHNCH<sub>2</sub>CH<sub>2</sub>(C{NCHCHN<sup>i</sup>Pr})]) with early to late lanthanide metals were conveniently synthesized in moderate yields by a protonolysis strategy via the direct reaction of LiLn(N<sup>i</sup>Pr<sub>2</sub>)<sub>4</sub><i></i> with [H<sub>2</sub>L]Br (<b>1</b>). All complexes were characterized by X-ray crystal determinations.