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Electroluminescence of Tetradentate Pt(II) Complexes: O^N^N^O versus C^N^N^O Coordination

Pander, Piotr; *Gomes Franca, Larissa; Dias, Fernando B.; Kozhevnikov, Valery N.

Electroluminescence of Tetradentate Pt(II) Complexes: O^N^N^O versus C^N^N^O Coordination Thumbnail


Authors

Piotr Pander

Larissa Franca larissa.gomes-franca@durham.ac.uk
PGR Student Doctor of Philosophy

Valery N. Kozhevnikov



Abstract

Alkylation of one of the phenolic hydroxyl groups in a salen-type tetradentate ligand changes the coordination mode from O^N^N^O to the cyclometallating C^N^N^O type. The ligand was used to synthesize a new cyclometalated luminescent Pt(II) complex 2. While in solution the complex is poorly luminescent, in the solid state the emission is reinstated, which allowed one to evaluate complex 2 as a phosphorescent emitter in organic light-emitting diodes. 2 displays external quantum efficiency (EQE) = 9.1% and a maximum luminance of 9000 cd m–2 in a vacuum-deposited device. We carried out comparative analysis of photo- and electroluminescence of complex 2 with O^N^N^O complex 1 and demonstrated that the similar luminescent properties of the O^N^N^O and C^N^N^O complexes are rather coincidental because they display different excited-state landscapes. Surprisingly, the two complexes display a dramatically different electrochemical behavior, with O^N^N^O coordination leading to the formation of a stable electropolymer but C^N^N^O coordination fully preventing electropolymerization.

Journal Article Type Article
Online Publication Date Mar 30, 2023
Publication Date 2023
Deposit Date Jul 3, 2023
Publicly Available Date Jul 3, 2023
Journal Inorganic Chemistry
Print ISSN 0020-1669
Electronic ISSN 1520-510X
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 62
Issue 14
DOI https://doi.org/10.1021/acs.inorgchem.3c00364
Public URL https://durham-repository.worktribe.com/output/1168932

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