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

doi:10.1039/D1SC00846C

Bright luminescent lithium and magnesium carbene complexes†‡

Piermaria Pinter,§^a Christoph M. Schüßlbauer,

§^ab Fabian A. Watt,

§^c Nicole Dickmann,^c Regine Herbst-Irmer,

^d Bernd Morgenstern,^e Annette Grünwald,^af Tobias Ullrich,^ab Michael Zimmer,^g Stephan Hohloch,

*^h Dirk M. Guldi

*^ab and Dominik Munz

*^af

Author affiliations

* Corresponding authors

^a Department of Chemistry and Pharmacy, Friedrich-Alexander University, Erlangen-Nürnberg Egerlandstr. 1-3, D-91058 Erlangen, Germany

^b Interdisciplinary Center for Molecular Materials (ICMM), Friedrich-Alexander University, Erlangen-Nürnberg Egerlandstr. 3, D-91058 Erlangen, Germany

^c Department of Chemistry, Inorganic Chemistry, Paderborn University, Warburger Straße 100, D-33098 Paderborn, Germany

^d University of Göttingen, Institute of Inorganic Chemistry, Tammannstraße 4, D-37077 Göttingen, Germany

^e Inorganic Solid State Chemistry, Saarland University, Campus C4.1, D-66123 Saarbrücken, Germany

^f Inorganic Chemistry: Coordination Chemistry, Saarland University, Campus C4.1, D-66123 Saarbrücken, Germany
E-mail: dominik.munz@uni-saarland.de

^g Inorganic and General Chemistry, Saarland University, Campus C4.1, D-66123 Saarbrücken, Germany

^h Institute of General, Inorganic and Theoretical Chemistry, University of Innsbruck, Innrain 80-82, A-6020 Innsbruck, Austria

Abstract

We report on the convenient synthesis of a CNC pincer ligand composed of carbazole and two mesoionic carbenes, as well as the corresponding lithium- and magnesium complexes. Mono-deprotonation affords a rare “naked” amide anion. In contrast to the proligand and its mono-deprotonated form, tri-deprotonated s-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.

Chemical Science

Bright luminescent lithium and magnesium carbene complexes†‡

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