Synthesis and vibrational spectroscopic analysis of some Hofmann type clathrates

New Hofmann type clathrates in the form of M(pp)2Ni(CN)4·2G (where pp = 1-phenylpiperazine, G = 1,4-dioxane and M = Ni, Co or Cd) have been prepared in powder form and their FT-IR and FT-Raman spectra are reported. The results suggest that the present compounds are similar in structure to the Hofmann type clathrates and their structures consist of conjugated polymeric layers of |M–Ni(CN)4|∞ with the pp bound to the metal (M) atom.

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► Vibrational investigation of Hofmann type clathrates.
► Using a non-aromatic guest molecule as 1,4-dioxane.
► The host–guest interactions are weak.
► The trapped 1,4-dioxane guest molecules have kept their free forms.