Excited state interactions between the chiral Au 38 L 24 cluster and covalently attached porphyrin

Varnholt, Birte; Letrun, Romain; Bergkamp, Jesse J.; Fu, Yongchun; Yushchenko, Oleksandr; Decurtins, Silvio; Vauthey, Eric; Liu, Shi-Xia; Bürgi, Thomas (2015). Excited state interactions between the chiral Au 38 L 24 cluster and covalently attached porphyrin. Physical Chemistry Chemical Physics, 17(22), pp. 14788-14795. Royal Society of Chemistry 10.1039/C5CP01638J

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A protected S-acetylthio porphyrin was synthesized and attached to the Au38(2-phenylethanethiolate)24 cluster in a ligand exchange reaction. Chiral high performance liquid chromatography of the functionalized cluster yielded enantiomeric pairs of clusters probably differing in the binding site of the porphyrin. As proven by circular dichroism, the chirality was maintained. Exciton coupling between the cluster and the chromophore is observed. Zinc can be incorporated into the porphyrin attached to the cluster, as evidenced by absorption and fluorescence spectroscopy, however, the reaction is slow. Quenching of the chromophore fluorescence is observed, which can be explained by energy transfer from the porphyrin to the cluster. Transient absorption spectra of Au38(2-phenylethanethiolate)24 and the functionalized cluster probe the bleach of the gold cluster due to ground state absorption and the characteristic excited state absorption signals. Zinc incorporation does not have a pronounced effect on the photophysical behaviour. Decay times are typical for the molecular behaviour of small monolayer protected gold clusters.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Departement of Chemistry and Biochemistry

UniBE Contributor:

Decurtins, Silvio and Liu, Shi-Xia

Subjects:

500 Science > 540 Chemistry

ISSN:

1463-9076

Publisher:

Royal Society of Chemistry

Language:

English

Submitter:

Silvio Decurtins

Date Deposited:

11 Jun 2015 13:25

Last Modified:

14 Jan 2016 08:50

Publisher DOI:

10.1039/C5CP01638J

PubMed ID:

25975779

BORIS DOI:

10.7892/boris.69458

URI:

https://boris.unibe.ch/id/eprint/69458

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