Please use this identifier to cite or link to this item:
http://doi.org/10.25358/openscience-8936
Authors: | Sikora, Philipp Naumann, Robert Förster, Christoph Heinze, Katja |
Title: | Excited state energy landscape of phosphorescent group 14 complexes |
Online publication date: | 20-Apr-2023 |
Year of first publication: | 2023 |
Language: | english |
Abstract: | Great progress has been achieved on phosphorescent or photoactive complexes of the Earth-abundant transition metals, while examples for phosphorescent heavy main group element complexes are rare, in particular for group 14 complexes in the oxidation state +II. The known compounds often show only weak phosphorescence with fast non-radiative deactivation. The underlying photophysical processes and the nature of the phosphorescent electronic states have remained essentially unexplored. The present combined photophysical and theoretical study on tin(II) and lead(II) complexes E(bpep) with the dianionic tridentate ligand bpep2− (E = Sn, Pb; H2bpep = 2-[1,1-bis(1H-pyrrol-2-yl)ethyl]pyridine) provides unprecedented insight in the excited state energy landscape of tetrel(II) complexes. The tin complex shows green intraligand charge transfer (ILCT) phosphorescence both in solution and in the solid state. In spite of its larger heavy-atom effect, the lead complex only shows very weak red phosphorescence from a strongly distorted ligand-to-metal charge transfer (LMCT) state at low temperatures in the solid state. Detailed (TD-)DFT calculations explain these observations and delineate the major path of non-radiative deactivation via distorted LMCT states. These novel insights provide rational design principles for tetrel(II) complexes with long-lived phosphorescence. |
DDC: | 540 Chemie 540 Chemistry and allied sciences |
Institution: | Johannes Gutenberg-Universität Mainz |
Department: | FB 09 Chemie, Pharmazie u. Geowissensch. |
Place: | Mainz |
ROR: | https://ror.org/023b0x485 |
DOI: | http://doi.org/10.25358/openscience-8936 |
Version: | Published version |
Publication type: | Zeitschriftenaufsatz |
Document type specification: | Scientific article |
License: | CC BY-NC |
Information on rights of use: | https://creativecommons.org/licenses/by-nc/4.0/ |
Journal: | Chemical science 14 10 |
Pages or article number: | 2489 2500 |
Publisher: | RSC |
Publisher place: | Cambridge |
Issue date: | 2023 |
ISSN: | 2041-6539 |
Publisher DOI: | 10.1039/d2sc06984a |
Appears in collections: | DFG-491381577-D |
Files in This Item:
File | Description | Size | Format | ||
---|---|---|---|---|---|
excited_state_energy_landscap-20230317142819605.pdf | 4.12 MB | Adobe PDF | View/Open |