Iminophosphonamido-Supported Plumbyliumylidenes: Structural Effects of Counter Anions and Lewis Acid Catalysis

Two-coordinate plumbyliumylidene ions constitute a rare class of highly electron-deficient cationic Pb(II) species. Herein, we report the synthesis and structural characterization of iminophosphonamido-supported plumbyliumylidene ions bearing two different borate counteranions, {B[(4-<sup><i>t</i></sup>BuMe<sub>2</sub>Si)C<sub>6</sub>F<sub>4</sub>]<sub>4</sub>}<sup>-</sup> and [B(C<sub>6</sub>F<sub>5</sub>)<sub>4</sub>]<sup>-</sup>. Single-crystal X-ray analyses reveal pronounced ion-pairing eff