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Unusual Excimer/Dimer Behavior of a Highly Soluble C,N Platinum(II) Complex with a Spiro-Fluorene Motif

[Image: see text] In this work, we introduce a spiro-fluorene unit into a phenylpyridine (CN)-type ligand as a simple way to deplanarize the structure and increase the solubility of the final platinum(II)···complex. Using a spiro-fluorene unit, orthogonal to the main coordination plane of the comple...

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Autores principales: Pander, Piotr, Zaytsev, Andrey V., Franca, Larissa Gomes, Dias, Fernando B., Kozhevnikov, Valery N.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2023
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10647119/
https://www.ncbi.nlm.nih.gov/pubmed/37905928
http://dx.doi.org/10.1021/acs.inorgchem.3c02667
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author Pander, Piotr
Zaytsev, Andrey V.
Franca, Larissa Gomes
Dias, Fernando B.
Kozhevnikov, Valery N.
author_facet Pander, Piotr
Zaytsev, Andrey V.
Franca, Larissa Gomes
Dias, Fernando B.
Kozhevnikov, Valery N.
author_sort Pander, Piotr
collection PubMed
description [Image: see text] In this work, we introduce a spiro-fluorene unit into a phenylpyridine (CN)-type ligand as a simple way to deplanarize the structure and increase the solubility of the final platinum(II)···complex. Using a spiro-fluorene unit, orthogonal to the main coordination plane of the complex, reduces intermolecular interactions, leading to increased solubility but without significantly affecting the ability of the complex to form Pt···Pt dimers and excimers. This approach is highly important in the design of platinum(II) complexes, which often suffer from low solubility due to their mainly planar structure, and offers an alternative to the use of bulky alkyl groups. The nonplanar structure is also beneficial for vacuum-deposition techniques as it lowers the sublimation temperature. Importantly, there are no sp(3) hybridized carbon atoms in the cyclometalating ligand that contain hydrogens, the undesired feature that is associated with the low stability of the materials in OLEDs. The complex displays high solubility in toluene, ∼10 mg mL(–1), at room temperature, which allows producing solution-processed OLEDs in a wide range of doping concentrations, 5–100%, and EQE up to 5.9%, with a maximum luminance of 7400 cd m(–2). Concurrently, we have also produced vacuum-deposited OLEDs, which display luminance up to 32 500 cd m(–2) and a maximum EQE of 11.8%.
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spelling pubmed-106471192023-11-15 Unusual Excimer/Dimer Behavior of a Highly Soluble C,N Platinum(II) Complex with a Spiro-Fluorene Motif Pander, Piotr Zaytsev, Andrey V. Franca, Larissa Gomes Dias, Fernando B. Kozhevnikov, Valery N. Inorg Chem [Image: see text] In this work, we introduce a spiro-fluorene unit into a phenylpyridine (CN)-type ligand as a simple way to deplanarize the structure and increase the solubility of the final platinum(II)···complex. Using a spiro-fluorene unit, orthogonal to the main coordination plane of the complex, reduces intermolecular interactions, leading to increased solubility but without significantly affecting the ability of the complex to form Pt···Pt dimers and excimers. This approach is highly important in the design of platinum(II) complexes, which often suffer from low solubility due to their mainly planar structure, and offers an alternative to the use of bulky alkyl groups. The nonplanar structure is also beneficial for vacuum-deposition techniques as it lowers the sublimation temperature. Importantly, there are no sp(3) hybridized carbon atoms in the cyclometalating ligand that contain hydrogens, the undesired feature that is associated with the low stability of the materials in OLEDs. The complex displays high solubility in toluene, ∼10 mg mL(–1), at room temperature, which allows producing solution-processed OLEDs in a wide range of doping concentrations, 5–100%, and EQE up to 5.9%, with a maximum luminance of 7400 cd m(–2). Concurrently, we have also produced vacuum-deposited OLEDs, which display luminance up to 32 500 cd m(–2) and a maximum EQE of 11.8%. American Chemical Society 2023-10-31 /pmc/articles/PMC10647119/ /pubmed/37905928 http://dx.doi.org/10.1021/acs.inorgchem.3c02667 Text en © 2023 The Authors. Published by American Chemical Society https://creativecommons.org/licenses/by/4.0/Permits the broadest form of re-use including for commercial purposes, provided that author attribution and integrity are maintained (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Pander, Piotr
Zaytsev, Andrey V.
Franca, Larissa Gomes
Dias, Fernando B.
Kozhevnikov, Valery N.
Unusual Excimer/Dimer Behavior of a Highly Soluble C,N Platinum(II) Complex with a Spiro-Fluorene Motif
title Unusual Excimer/Dimer Behavior of a Highly Soluble C,N Platinum(II) Complex with a Spiro-Fluorene Motif
title_full Unusual Excimer/Dimer Behavior of a Highly Soluble C,N Platinum(II) Complex with a Spiro-Fluorene Motif
title_fullStr Unusual Excimer/Dimer Behavior of a Highly Soluble C,N Platinum(II) Complex with a Spiro-Fluorene Motif
title_full_unstemmed Unusual Excimer/Dimer Behavior of a Highly Soluble C,N Platinum(II) Complex with a Spiro-Fluorene Motif
title_short Unusual Excimer/Dimer Behavior of a Highly Soluble C,N Platinum(II) Complex with a Spiro-Fluorene Motif
title_sort unusual excimer/dimer behavior of a highly soluble c,n platinum(ii) complex with a spiro-fluorene motif
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10647119/
https://www.ncbi.nlm.nih.gov/pubmed/37905928
http://dx.doi.org/10.1021/acs.inorgchem.3c02667
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