Issue 20, 2022

Photoinduced host-to-guest electron transfer in a self-assembled coordination cage

Abstract

A [Pd2L4] coordination cage, assembled from electron-rich phenothiazine-based ligands and encapsulating an electron-deficient anthraquinone-based disulfonate guest, is reported. Upon excitation at 400 nm, transient absorption spectroscopy unveils photoinduced electron transfer from the host's chromophores to the guest, as indicated by characteristic spectral features assigned to the oxidized donor and reduced acceptor. The structure of the host–guest complex was characterized by NMR spectroscopy, mass spectrometry and single-crystal X-ray analysis. Spectroelectrochemical experiments and DFT calculations both agree with the proposed light-induced charge separation. A kinetic analysis of the involved charge transfer channels reveals, besides a guest-independent LMCT path, 44% efficiency for the host–guest charge transfer (HGCT).

Graphical abstract: Photoinduced host-to-guest electron transfer in a self-assembled coordination cage

Supplementary files

Article information

Article type
Research Article
Submitted
22 Aug. 2022
Accepted
24 Aug. 2022
First published
24 Aug. 2022
This article is Open Access
Creative Commons BY license

Org. Chem. Front., 2022,9, 5485-5493

Photoinduced host-to-guest electron transfer in a self-assembled coordination cage

S. Ganta, J. Borter, C. Drechsler, J. J. Holstein, D. Schwarzer and G. H. Clever, Org. Chem. Front., 2022, 9, 5485 DOI: 10.1039/D2QO01339H

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