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10.1021/acs.inorgchem.2c02039
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Título: | Phosphorescent Tris-cyclometalated Pt(IV) Complexes with Mesoionic N‐Heterocyclic Carbene and 2‐Arylpyridine Ligands |
Fecha de publicación: | 21-jul-2022 |
Cita bibliográfica: | Inorganic Chemistry 2022, 61, 12033−12042 |
ISSN: | 0020-1669 |
Materias relacionadas: | CDU::5 - Ciencias puras y naturales::54 - Química::546 - Química inorgánica |
Palabras clave: | Platino Luminiscencia Complejos ciclometalados |
Resumen: | The synthesis, structure, photophysical properties, and electrochemistry of the first series of Pt(IV) tris-chelates bearing cyclometalated aryl-NHC ligands are reported. The complexes have the general formula [Pt(trz)2(C∧N)]+, combining two units of the cyclometalated, mesoionic aryl-NHC ligand 4- butyl-3-methyl-1-phenyl-1H-1,2,3-triazol-5-ylidene (trz) with a cyclometalated 2-arylpyridine [C∧N = 2-(2,4-difluorophenyl)- pyridine (dfppy), 2-phenylpyridine (ppy), 2-(p-tolyl)pyridine (tpy), 2-(2-thienyl)pyridine (thpy), 2-(9,9-dimethylfluoren-2-yl)- pyridine (flpy)], and presenting a mer arrangement or metalated aryls. They exhibit a significant photostability under UV irradiation and long-lived phosphorescence in the blue to yellow color range, arising from 3LC excited states involving the C∧N ligands, with quantum yields of up to 0.34 in fluid solution and 0.77 in the rigid matrix at 298 K. The time-dependent density functional theory (TD-DFT) calculations reveal that nonemissive, deactivating excited states of ligand-to-metal charge-transfer (LMCT) character are pushed to high energies as a consequence of the strong σ-donating ability of the carbenic moieties, making the Pt(trz)2 subunit an essential structural component that enables efficient emissions from the chromophoric C∧N ligands, with potential application for the development of different Pt(IV) emitters with tunable properties. |
Autor/es principal/es: | Vivancos, Ángela Bautista, Delia González Herrero, Pablo |
Facultad/Departamentos/Servicios: | Facultad de Química Departamento de Química Inorgánica |
URI: | http://hdl.handle.net/10201/138171 |
DOI: | 10.1021/acs.inorgchem.2c02039 |
Tipo de documento: | info:eu-repo/semantics/article |
Número páginas / Extensión: | 10 |
Derechos: | info:eu-repo/semantics/embargoedAccess Atribución 4.0 Internacional |
Descripción: | ©2022. This manuscript version is made available under the CCBY 4.0 license http://creativecommons.org/licenses/by/4.0/ This document is the Accepted, version of a Published Work that appeared in final form in Inorganic Chemistry. To access the final edited and published work see https://doi.org/10.1021/acs.inorgchem.2c02039 |
Aparece en las colecciones: | Artículos: Química Inorgánica |
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