Issue 23, 2023

Reaching strong absorption up to 700 nm with new benzo[g]quinoxaline-based heteroleptic copper(i) complexes for light-harvesting applications

Abstract

Heteroleptic copper(I) complexes, with a diimine as a chromophoric unit and a bulky diphosphine as an ancillary ligand, have the advantage of a reduced pseudo Jahn–Teller effect in their excited state over the corresponding homoleptic bis(diimine) complexes. Nevertheless, their lowest absorption lies generally between 350 to 500 nm. Aiming at a strong absorption in the visible by stable heteroleptic Cu(I) complexes, we designed a novel diimine based on 4-(benzo[g]quinoxal-2′-yl)-1,2,3-triazole derivatives. The large π-conjugation of the benzoquinoxaline moiety shifted bathochromically the absorption with regard to other diimine-based Cu(I) complexes. Adding another Cu(I) core broadened the absorption and extended it to considerably longer wavelengths. Moreover, by fine-tuning the structure of the dichelating ligand, we achieved a panchromatic absorption up to 700 nm with a high molar extinction coefficient of 8000 M−1 cm−1 at maximum (λ = 570 nm), making this compound attractive for light-harvesting antennae.

Graphical abstract: Reaching strong absorption up to 700 nm with new benzo[g]quinoxaline-based heteroleptic copper(i) complexes for light-harvesting applications

Supplementary files

Article information

Article type
Paper
Submitted
24 Mar 2023
Accepted
02 May 2023
First published
03 May 2023
This article is Open Access
Creative Commons BY license

Dalton Trans., 2023,52, 7809-7818

Reaching strong absorption up to 700 nm with new benzo[g]quinoxaline-based heteroleptic copper(I) complexes for light-harvesting applications

C. Bruschi, X. Gui, O. Fuhr, W. Klopper and C. Bizzarri, Dalton Trans., 2023, 52, 7809 DOI: 10.1039/D3DT00902E

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