Bright luminescent lithium and magnesium carbene complexes
Piermaria Pinter, Christoph M. Schüßlbauer, Fabian A. Watt, Nicole Dickmann, Regine Herbst‐Irmer, Bernd Morgenstern, Annette Grünwald, Tobias Ullrich, Michael Zimmer, Stephan Hohloch, Dirk M. Guldi, Dominik Munz
Abstract
-block complexes show bright luminescence, and their photophysical properties were therefore investigated by absorption- and luminescence spectroscopy. They reveal a quantum yield of 16% in solution at ambient temperature. Detailed quantum-chemical calculations assist in rationalizing the emissive properties based on an Intra-Ligand-Charge-Transfer (ILCT) between the carbazolido- and mesoionic carbene ligands. (Earth-)alkali metals prevent the distortion of the ligand following excitation and, thus, by avoiding non-radiative deactivation support bright luminescence.