Using Raman spectroscopy four layered metal iodides (PbI₂, BiI₃, CdI₂ and AgI) crystalline samples intercalated with pyridine have been studied. After intercalation, both Raman spectra of host material and guest molecule are modified. All as growth investigated samples are featured by specific Raman spectra situated in the 40-200 cm^-1 range. The Raman spectra of the intercalated compounds reveal new bands, keeping the original crystal signature. Changes in the Raman spectrum of the guest molecules are also observed. The most significant, considered as an evidence of a chemical interaction between pyridine molecules and layered metal iodide, are the enhancement of the Raman lines situated at 1574-1598 cm^-1 and the appearence of  new Raman line at ~ 3066 cm^-1. Based on these data result that the intercalation process evolves in two steps: i) initially neutral pyridine molecules are inserted between the metal iodide layers and ii) afterwards due to the chemical interaction, between metal ion and nitrogen atom of the guest molecules, a coordinated complex is formed. Photoluminescence observed at liquid nitrogen temperature on intercalated compound sustains this mechanism.

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