Bright luminescent lithium and magnesium carbene complexes

Pinter P, Schüßlbauer C, Watt FA, Dickmann N, Herbst-Irmer R, Morgenstern B, Grünwald A, Ullrich T, Zimmer M, Hohloch S, Guldi DM, Munz D (2021)

Publication Type: Journal article

Publication year: 2021

Journal

DOI: 10.1039/d1sc00846c

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.

Authors with CRIS profile

Involved external institutions

Universität Paderborn Germany (DE) Georg-August-Universität Göttingen Germany (DE) Universität des Saarlandes (UdS) Germany (DE) Leopold-Franzens-Universität Innsbruck / University of Innsbruck Austria (AT)

How to cite

APA:

Pinter, P., Schüßlbauer, C., Watt, F.A., Dickmann, N., Herbst-Irmer, R., Morgenstern, B.,... Munz, D. (2021). Bright luminescent lithium and magnesium carbene complexes. Chemical Science. https://dx.doi.org/10.1039/d1sc00846c

MLA:

Pinter, Piermaria, et al. "Bright luminescent lithium and magnesium carbene complexes." Chemical Science (2021).

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