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The largest cluster characterized to date by a crystal structure analysis , Cu 146 Se 73 (PPh 3 ) 30 , forms in the reaction of CuCL with Se(SiMe 3 ) 2 in the presence of PPh 3 in THF. The Cu‐Se core of this huge cluster is shielded perfectly by the PPh 3 ligands. In this way, a molecule with a diameter of about 40 Å is formed. As a result of a certain structural similarity with Cu 2 Se, the cluster could be considered as a Cu 2 Se particle protected by ligands.
Krautscheid et al. (Wed,) studied this question.