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Chiral Phase Transfer and Enantioenrichment of Thiolate-Protected Au102 Clusters

Wong, O. Andrea
Malola, Sami
Häkkinen, Hannu
Verbiest, Thierry
Ackerson, Christopher J.
Published in Journal of the American Chemical Society. 2014, vol. 136, no. 11, p. 4129-4132
Abstract The Au102(p-MBA)44 cluster (p-MBA: para-mercaptobenzoic acid) is observed as a chiral compound comprised of achiral components in its single-crystal structure. So far the enantiomers observed in the crystal structure are not isolated, nor is the circular dichroism spectrum known. A chiral phase transfer method is presented which allows partial resolution of the enantiomers by the use of a chiral ammonium bromide, (−)-1R,2S-N-dodecyl-N-methylephedrinium bromide ((−)-DMEBr). At sufficiently low concentration of (−)-DMEBr, the phase transfer from water to chloroform is incomplete. Both the aqueous and organic phases show optical activity of near mirror image relationship. Differences in the spectra are ascribed to the formation of diastereomeric salts. At high concentrations of (−)-DMEBr, full phase transfer is observed. The organic phase, however, still displays optical activity. We assume that one of the diastereomers has very strong optical activity, which overrules the cancelation of the spectra with opposite sign. Comparison with computations further corroborates the experimental data and allows a provisional assignment of handedness of each fraction.
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Research group Groupe Bürgi
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KNOPPE, Stefan et al. Chiral Phase Transfer and Enantioenrichment of Thiolate-Protected Au102 Clusters. In: Journal of the American Chemical Society, 2014, vol. 136, n° 11, p. 4129-4132. doi: 10.1021/ja500809p https://archive-ouverte.unige.ch/unige:94110

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Deposited on : 2017-05-10

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