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Remote modification of bidentate phosphane ligands controlling the photonic properties in their complexes: enhanced performance of [Cu(RN-xantphos)(N^N)][PF6] complexes in light-emitting electrochemical cells

Arnosti, Nina and Brunner, Fabian and Susic, Isidora and Keller, Sarah and Junquera-Hernández, José M. and Prescimone, Alessandro and Bolink, Henk J. and Sessolo, Michele and Orti, Enrique and Housecroft, Catherine E. and Constable, Edwin C.. (2020) Remote modification of bidentate phosphane ligands controlling the photonic properties in their complexes: enhanced performance of [Cu(RN-xantphos)(N^N)][PF6] complexes in light-emitting electrochemical cells. Advanced Optical Materials , 8. p. 1901689.

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Abstract

A series of copper(I) complexes of the type [Cu(HN-xantphos)(N^N)][PF6] and [Cu(BnN-xantphos)(N^N)][PF6], in which N^N = bpy, Mebpy and Me2bpy, HN-xantphos = 4,6-bis(diphenylphosphanyl)-10H-phenoxazine and BnN-xantphos = 10-benzyl-4,6-bis(diphenylphosphanyl)-10H-phenoxazine is described. The single crystal structures of [Cu(HN-xantphos)(Mebpy)][PF6] and [Cu(BnN-xantphos)(Me2bpy)][PF6] confirm the presence of N^N and P^P chelating ligands with the copper(I) atoms in distorted coordination environments. Solution electrochemical and photophysical properties of the BnN-xantphos-containing compounds (for which the highest-occupied molecular orbital is located on the phenoxazine moiety) are reported. The first oxidation of [Cu(BnN-xantphos)(N^N)][PF6] occurs on the BnN-xantphos ligand. Time-dependent density functional theory (TD-DFT) calculations have been used to analyze the solution absorption spectra of the [Cu(BnN-xantphos)(N^N)][PF6] compounds. In the solid-state, the compounds show photoluminescence in the range 518-555 nm for [Cu(HN-xantphos)(N^N)][PF6] and 520-575 nm for [Cu(BnN-xantphos)(N^N)][PF6] with a blue-shift on going from bpy to Mebpy to Me2bpy. [Cu(BnN-xantphos)(Me2bpy)][PF6] exhibits a solid-state photoluminescence quantum yield of 55% with an excited state lifetime of 17.4 µs. Bright light-emitting electrochemical cells were obtained using this complex, and we show that the electroluminescence quantum yield can be enhanced by using less conducting hole injection layers
Faculties and Departments:05 Faculty of Science > Departement Chemie > Chemie > Anorganische Chemie (Constable)
05 Faculty of Science > Departement Chemie > Chemie > Anorganische Chemie (Housecroft)
UniBasel Contributors:Housecroft, Catherine Elizabeth and Constable, Edwin Charles and Arnosti, Nina and Brunner, Fabian and Prescimone, Alessandro and Keller, Sarah
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Wiley
e-ISSN:2195-1071
Note:Publication type according to Uni Basel Research Database: Journal article
Language:English
Identification Number:
Last Modified:15 Apr 2020 13:09
Deposited On:15 Apr 2020 13:09

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