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

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

doi:10.1021/acs.inorgchem.3c00364

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

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

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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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.

Original language	English
Pages (from-to)	5772–5779
Journal	Inorganic Chemistry
Volume	62
Issue number	14
Early online date	30 Mar 2023
DOIs	https://doi.org/10.1021/acs.inorgchem.3c00364
Publication status	Published - 10 Apr 2023

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@article{65f3d4b9d15a4b92a9287822b2c48270,

title = "Electroluminescence of Tetradentate Pt(II) Complexes: O\textasciicircum{}N\textasciicircum{}N\textasciicircum{}O versus C\textasciicircum{}N\textasciicircum{}N\textasciicircum{}O Coordination",

abstract = "Alkylation of one of the phenolic hydroxyl groups in a salen-type tetradentate ligand changes the coordination mode from O\textasciicircum{}N\textasciicircum{}N\textasciicircum{}O to the cyclometallating C\textasciicircum{}N\textasciicircum{}N\textasciicircum{}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\textasciicircum{}N\textasciicircum{}N\textasciicircum{}O complex 1 and demonstrated that the similar luminescent properties of the O\textasciicircum{}N\textasciicircum{}N\textasciicircum{}O and C\textasciicircum{}N\textasciicircum{}N\textasciicircum{}O complexes are rather coincidental because they display different excited-state landscapes. Surprisingly, the two complexes display a dramatically different electrochemical behavior, with O\textasciicircum{}N\textasciicircum{}N\textasciicircum{}O coordination leading to the formation of a stable electropolymer but C\textasciicircum{}N\textasciicircum{}N\textasciicircum{}O coordination fully preventing electropolymerization.",

author = "Piotr Pander and \{Gomes Franca\}, Larissa and Dias, \{Fernando B.\} and Kozhevnikov, \{Valery N.\}",

year = "2023",

month = apr,

day = "10",

doi = "10.1021/acs.inorgchem.3c00364",

language = "English",

volume = "62",

pages = "5772–5779",

journal = "Inorganic Chemistry",

issn = "0020-1669",

publisher = "American Chemical Society",

number = "14",

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TY - JOUR

T1 - Electroluminescence of Tetradentate Pt(II) Complexes: O^N^N^O versus C^N^N^O Coordination

AU - Pander, Piotr

AU - Gomes Franca, Larissa

AU - Dias, Fernando B.

AU - Kozhevnikov, Valery N.

PY - 2023/4/10

Y1 - 2023/4/10

N2 - 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.

AB - 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.

UR - https://www.scopus.com/pages/publications/85151326910

U2 - 10.1021/acs.inorgchem.3c00364

DO - 10.1021/acs.inorgchem.3c00364

M3 - Article

SN - 0020-1669

VL - 62

SP - 5772

EP - 5779

JO - Inorganic Chemistry

JF - Inorganic Chemistry

IS - 14

ER -

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

Abstract

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