Photoinduced host-to-guest electron transfer in a self-assembled coordination cage.
Org Chem Front
; 9(20): 5485-5493, 2022 Oct 11.
Article
em En
| MEDLINE
| ID: mdl-36324316
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).
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Coleções:
01-internacional
Base de dados:
MEDLINE
Idioma:
En
Revista:
Org Chem Front
Ano de publicação:
2022
Tipo de documento:
Article