Bright luminescent lithium and magnesium carbene complexes.
Piermaria PinterChristoph M SchüßlbauerFabian A WattNicole DickmannRegine Herbst-IrmerBernd MorgensternAnnette GrünwaldTobias UllrichMichael ZimmerStephan HohlochDirk Michael GuldiDominik MunzPublished in: Chemical science (2021)
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.
Keyphrases
- energy transfer
- light emitting
- quantum dots
- solid state
- molecular dynamics
- air pollution
- magnetic resonance
- particulate matter
- high resolution
- density functional theory
- magnetic resonance imaging
- monte carlo
- ionic liquid
- molecular dynamics simulations
- genome wide
- single cell
- sensitive detection
- gene expression
- mass spectrometry
- health risk assessment
- computed tomography
- drinking water
- climate change