Closo- or Nido-Carborane Diphosphane as responsible for strong thermochromism or Time Activated Delayed Fluorescence (TADF) in [Cu(N^N)(P^P)]0/+

Alconchel, A. ; Crespo, O. (Universidad de Zaragoza) ; García-Orduña, P. ; Gimeno, M.C.

Resumen: Ortho-closo or ortho-nido-carborane-diphosphanes have been selected to prepare the heteroleptic cationic or neutral [Cu(N^N){(PPh2)2C2B10H10}]PF6 (1) and [Cu(N^N){(PPh2)2C2B9H10}] (2) [N^N = 2-(4-thiazolyl)benzimidazole], respectively. Complexes 1 and 2 display very different emissive behavior. Neutral complex 2 exhibits TADF (time activated delayed fluorescence) which has been studied both as powder and PMMA composite with similar ¿E(S1 - T1), t(T1), and t(S1) in both phases. Cationic complex 1 displays a much lower quantum yield than 2 and does not show TADF, but it exhibits a significant thermochromic luminescence, and its emission is very dependent on the medium. Theoretical studies show that metal-ligand (M-diphosphane) to ligand (L', diimine) transitions, MLL'CT, are responsible of the transitions which originate the emissive properties, but with very different contribution of the copper center, carborane cluster, and diphosphane phenyl rings for 1 and 2. © 2021 The Authors. Published by American Chemical Society.

Idioma: Inglés

DOI: 10.1021/acs.inorgchem.1c03092

Año: 2021

Publicado en: Inorganic Chemistry 60, 23 (2021), 18521-18528
ISSN: 0020-1669

Factor impacto JCR: 5.436 (2021)

Categ. JCR: CHEMISTRY, INORGANIC & NUCLEAR rank: 5 / 46 = 0.109 (2021) - Q1 - T1

Factor impacto SCIMAGO: 1.121 - Inorganic Chemistry (Q1) - Chemistry (miscellaneous) (Q1)

Financiación: info:eu-repo/grantAgreement/ES/MICINN/PID2019-104379RB-C21

Tipo y forma: Artículo (Versión definitiva)

Área (Departamento): Área Química Inorgánica (Dpto. Química Inorgánica)