Abstract
Optical absorption spectra of aqueous solutions of the giant cluster Pd561Phen60(OAc)180 (1) were studied in air and after treatment with H2. The results obtained were compared with the corresponding data for 2—4-nm nanoparticles of colloidal palladium prepared by the radiochemical and chemical reduction of the PdII complexes in aqueous solutions. The optical spectra of cluster 1 and nanoparticles of colloidal palladium are of the same nature and are caused by the light absorption by free electrons in the metal.
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