A Lead(II) Substituted Triplet Carbene
Fabian Dankert, Julian Messelberger, Ugo Authesserre, Abinash Swain, David Scheschkewitz, Bernd Morgenstern, Dominik Munz
Abstract
High Resolution Image Download MS PowerPoint Slide Reaction of the pincer-type ligand L 3 supported complex [L 3 PbBr][BArF 24 ] ( 1 ) with Li[(C(═N 2 )TMS)] furnishes [L 3 Pb(C(═N 2 )TMS)][BArF 24 ] ( 2 ). Diazo-compound 2 eliminates dinitrogen upon irradiation affording formal plumba-alkyne 3, which persists in cold fluoroarene solutions. Variable temperature UV/Vis and NMR spectroscopies in combination with quantum-chemical calculations identify 3 as a metal-substituted triplet carbene. In-crystallo irradiation of [L 3 Pb(C(═N 2 )TMS)(tol)][BArF 24 ] ( 2 ·tol) provides a snapshot of intermolecular C–H bond insertion with toluene ( 4 ).