Abstract
The effect of binding pyridine to silver clusters has been studied by density functional calculations by adopting a hybrid functional. The calculations allow proposing an explanation for the different SERS spectra of the ligand observed on Ag colloids in the presence and in the absence of coadsorbed chloride anions. In the latter case, a better agreement is obtained modeling the system by adsorption of pyridine on a $$(Ag_{4})^{+2}$$ surface cluster.
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