On the Electronic Structures of Au-25(SR)(18) Clusters Studied by Magnetic Circular Dichroism Spectroscopy

作者：Yao Hiroshi^*

来源：Journal of Physical Chemistry Letters, 2012, 3(12): 1701-1706.

DOI：10.1021/jz300396u

The first magnetic circular dichroism (MCD) spectra are reported at room temperature for well-defined thiolate-protected Au-25 clusters (Au-25(SG)(18) and Au-25(PET)(18), where SG and PET denote glutathione and 2-phenylethanethiolate, respectively). MCD essentially corresponds to electronic transitions in the absorption spectrum, so the electronic structures of the Au-25 clusters are explored based on a simultaneous deconvolution analysis of both the electronic absorption and MCD spectra, giving enhanced spectral resolution. We then find that the observed MCD responses are entirely interpreted in terms of the Faraday B terms, representing strict nondegeneracies of the excited and ground states of the Au-25 clusters that correspond to so-called superatom D and P orbitals, respectively.

• 出版日期2012-6-21