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A counterion study of a series of [Cu(P^P)(N^N)][A] compounds with bis(phosphane) and 6-methyl and 6,6'-dimethyl-substituted 2,2'-bipyridine ligands for light-emitting electrochemical cells

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A counterion study of a series of [Cu(P^P)(N^N)][A] compounds with bis(phosphane) and 6-methyl and 6,6'-dimethyl-substituted 2,2'-bipyridine ligands for light-emitting electrochemical cells

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dc.contributor.author	Meyer, Marco
dc.contributor.author	Mardegan, Lorenzo
dc.contributor.author	Tordera Salvador, Daniel
dc.contributor.author	Prescimone, Alessandro
dc.contributor.author	Sessolo, Michele
dc.contributor.author	Bolink, Henk
dc.contributor.author	Constable, Edwin C.
dc.contributor.author	Housecroft, Catherine E.
dc.date.accessioned	2022-01-27T13:56:08Z
dc.date.available	2022-01-27T13:56:08Z
dc.date.issued	2021
dc.identifier.citation	Meyer, Marco Mardegan, Lorenzo Tordera Salvador, Daniel Prescimone, Alessandro Sessolo, Michele Bolink, Henk Constable, Edwin C. Housecroft, Catherine E. 2021 A counterion study of a series of [Cu(P^P)(N^N)][A] compounds with bis(phosphane) and 6-methyl and 6,6'-dimethyl-substituted 2,2'-bipyridine ligands for light-emitting electrochemical cells Dalton Transactions 50 17920 17934
dc.identifier.uri	https://hdl.handle.net/10550/81449
dc.description.abstract	The syntheses and characterisations of a series of heteroleptic copper(I) compounds [Cu(POP)(Mebpy)][A], [Cu(POP)(Me2bpy)][A], [Cu(xantphos)(Mebpy)][A] and [Cu(xantphos)(Me2bpy)][A] in which [A]− is [BF4]−, [PF6]−, [BPh4]− and [BArF4]− (Mebpy = 6-methyl-2,2′-bipyridine, Me2bpy = 6,6′-dimethyl-2,2′-bipyridine, POP = oxydi(2,1-phenylene)bis(diphenylphosphane), xantphos = (9,9-dimethyl-9H-xanthene-4,5-diyl)bis(diphenylphosphane), [BArF4]− = tetrakis(3,5-bis(trifluoromethyl)phenyl)borate) are reported. Nine of the compounds have been characterised by single crystal X-ray crystallography, and the consequences of the different anions on the packing interactions in the solid state are discussed. The effects of the counterion on the photophysical properties of [Cu(POP)(N^N)][A] and [Cu(xantphos)(N^N)][A] (N^N = Mebpy and Me2bpy) have been investigated. In the solid-state emission spectra, the highest energy emission maxima are for [Cu(xantphos)(Mebpy)][BPh4] and [Cu(xantphos)(Me2bpy)][BPh4] (λemmax = 520 nm) whereas the lowest energy λemmax values occur for [Cu(POP)(Mebpy)][PF6] and [Cu(POP)(Mebpy)][BPh4] (565 nm and 563 nm, respectively). Photoluminescence quantum yields (PLQYs) are noticeably affected by the counterion; in the [Cu(xantphos)(Me2bpy)][A] series, solid-state PLQY values decrease from 62% for [PF6]−, to 44%, 35% and 27% for [BF4]−, [BPh4]− and [BArF4]−, respectively. This latter series of compounds was used as active electroluminescent materials on light-emitting electrochemical cells (LECs). The luminophores were mixed with ionic liquids (ILs) [EMIM][A] ([EMIM]+ = [1-ethyl-3-methylimidazolium]+) containing the same or different counterions than the copper(I) complex. LECs containing [Cu(xantphos)(Me2bpy)][BPh4] and [Cu(xantphos)(Me2bpy)][BArF4] failed to turn on under the LEC operating conditions, whereas those with the smaller [PF6]− or [BF4]− counterions had rapid turn-on times and exhibited maximum luminances of 173 and 137 cd m−2 and current efficiencies of 3.5 and 2.6 cd A−1, respectively, when the IL contained the same counterion as the luminophore. Mixing the counterions ([PF6]− and [BF4]−) of the active complex and the IL led to a reduction in all the figures of merit of the LECs.
dc.language.iso	eng
dc.relation.ispartof	Dalton Transactions, 2021, vol. 50, p. 17920-17934
dc.subject	Electroquímica
dc.title	A counterion study of a series of [Cu(P^P)(N^N)][A] compounds with bis(phosphane) and 6-methyl and 6,6'-dimethyl-substituted 2,2'-bipyridine ligands for light-emitting electrochemical cells
dc.type	journal article	es_ES
dc.date.updated	2022-01-27T13:56:09Z
dc.identifier.doi	10.1039/D1DT03239A
dc.identifier.idgrec	149984
dc.rights.accessRights	open access	es_ES