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Aromatic versus Aliphatic α-Diimine Ligands in Heteroleptic Copper(I) Emitters: Photophysical and Electrochemical Properties

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Abstract

The electrochemical and photophysical properties of a heteroleptic Cu(I) complex bearing an aliphatic α-diimine ligand, [Cu(dab)(xantphos)]+ (Cu-dab; dab = N,N’-diphenyl-2,3-dimethyl-1,4-diazabutadiene, xantphos = 4,5-bis(diphenylphosphino)-9,9-dimethylxanthene), were evaluated together with those of complexes [Cu(dmp)(xantphos)]+ (Cu-dmp; dmp = 2,9-dimethyl-1,10-phenanthroline), [Cu(dmbpy)(xantphos)]+ (Cu-dmbpy; dmbpy = 5,5’-dimethyl-2,2’-bipyridine), and [Cu(bq)(xantphos)]+ (Cu-bq; bq = 2,2’-biquinoline), bearing aromatic diimine ligands. Cu-dab exhibited a two-step ligand-centered redox behavior, where the first wave corresponded to an electrochemically reversible one-electron reduction process. Although Cu(I)-aromatic diimine complexes Cu-dmp, Cu-dmbpy, and Cu-bq exhibited obvious luminescence from the metal-to-ligand charge transfer (MLCT) excited state, Cu-dab did not show any luminescence. Computational studies indicated that this non-luminescent property was caused by the large structural relaxation of Cu-dab during photoexcitation.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Science, Hokkaido University, North-10 West-8, Kita, Sapporo, Hokkaido, 060-0810, Japan

    Sae Yanagida, Daisuke Saito, Atsushi Kobayashi & Masako Kato

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  1. Masaki Yoshida
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  2. Sae Yanagida
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  3. Daisuke Saito
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  4. Atsushi Kobayashi
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  5. Masako Kato
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Correspondence to Masako Kato.

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Yoshida, M., Yanagida, S., Saito, D. et al. Aromatic versus Aliphatic α-Diimine Ligands in Heteroleptic Copper(I) Emitters: Photophysical and Electrochemical Properties. ANAL. SCI. 36, 67–71 (2020). https://doi.org/10.2116/analsci.19SAP07

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