Abstract
Mass spectroscopic analysis revealed that Pd clusters passivated by thiolates and the stoichiometric thiolate complexes, Pd n( SR) 2n (n=5,6) , are formed in the reactions between palladium chloride and n-alkanethiols (RSH: R= n-C 18H 37, n-C 12H 25) in toluene. The Pd clusters thus formed are formulated as Pd n (SR) m with m∼0.6 n. The cluster sizes, distributed in the range of 5⩽ n⩽60, are consistent with their core diameters of ∼1 nm observed by TEM. A gap of ∼2 eV was observed in the optical transition of the Pd n (SR) m clusters showing the emergence of non-metallic properties as a result of size reduction.
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