Scientific article

Excited state interactions between the chiral Au38L24 cluster and covalently attached porphyrin

Published inPCCP. Physical chemistry chemical physics, vol. 17, no. 22, p. 14788-14795
Publication date2015

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 evidence by absorption and fluorescence spectroscopy, however, the reaction is slow.Quenching of the chromophores fluorescence is observed, which can be explained by energy transfer from the porphyrin to the cluster. Transient absorption spectra on the Au38(2-phenylethanethiolate)24 and the functionalized cluster probe the bleach of the gold cluster due to ground state absorption and 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.

Citation (ISO format)
VARNHOLT, Birte et al. Excited state interactions between the chiral Au<sub>38</sub>L<sub>24</sub> cluster and covalently attached porphyrin. In: PCCP. Physical chemistry chemical physics, 2015, vol. 17, n° 22, p. 14788–14795. doi: 10.1039/C5CP01638J
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Article (Published version)
ISSN of the journal1463-9076

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