Abstract
Oxidation of the surface-capping SPh - ligands of the CdS cluster [S 4 Cd 10 (SPh) 16 ] 4- in solution has been explored as a route to the synthesis of larger, well defined nanocrystals of CdS. Iodine was found to oxidise and remove the SPh - ligands and effect the growth of a CdS cluster with a sharp UV–VIS absorption peak at 371 nm. Electrospray mass spectra indicate that the first step in the transformation involves the loss of the four [Cd(SPh) 4 ] units at the cluster corners. Characterisation by FTIR and UV–VIS spectroscopy and X-ray powder diffraction showed that the material consists of iodide-capped clusters of approximately 15 A diameter. The isolated material redissolved in DMF where its emission spectrum showed a strong broad band at 510 nm.
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