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<b>Vibrational spectroscopic investigation of some Hofmann type clathrates: M(4-phenylpyridine)₂Ni(CN)₄.2G (M = Ni, Co and Cd, G = 1,4-dioxane) </b>

“…The infrared and Raman spectra of the compounds are shown in Figures 1 and 2. The spectral analysis of each compound has been performed by taking into account the 4-Phpy ligand molecule, Ni(CN) 4 ions and 1,4-dioxane guest molecule individually.…”

“…The M-4Phpy-Ni-D (M = Ni, Co and Cd) compounds were prepared as follows: firstly 1 mmol of K 2 Ni(CN) 4 (Acros, 98%, Belgium) was dissolved in distilled water, then slightly more than 2 mmols of 4-Phpy (Acros, 99%, Belgium) were added to this solution under stirring. After a short time, 3 mmols of 1,4-dioxane (Merck, 99%, Germany) was added to the prepared solution.…”

“…It can be said that the Hofmann type compounds are the members of the metal organic frameworks or coordination polymers. One-, two-and three-dimensional CN-bridged metal complex structures made up of building blocks such as linear [Ag(CN) 2 4 ] 2-, and of the complementary ligands such as ammonia, water, unidentate amine, bidentate α,ω-diaminoalkane, etc., are reviewed with an emphasis on their behaviour as hosts to afford clathrates inclusion compounds with guest molecules and as self-assemblies to form supramolecular structures with or without guest [1]. These metal complexes can act as adsorbents for gases, as molecular sieves, in sensing devices, as hosts for smaller guest molecules, in nonlinear optics devices and as magnetic materials [1].…”

“…Their general formula is M(II)L 2 M′(II)(CN) 4 .nG where, M is octahedrally coordinated metal: Mn, Fe, Co, Ni, Cu, Zn or Cd; M′ is square-planar coordinated metal: Ni, Pd or Pt; L is a unidentate ligand molecule and n is the number of G (guest) molecules depending on the bulkiness of the ligand and the guest molecule [1][2][3][4][5]. The host framework consists of two dimensional polymeric layers composed of ML 2 cations and M′(CN) 4 anions. The M′ atoms are coordinated to four C atoms of the CN groups in a square planar environment.…”

“…In the present work, three new M(4-Phpy) 2 Ni(CN) 4 .2C 4 H 8 O 2 clathrates (abbreviated hereafter as M-4Phpy-Ni-D) have been synthesized using a non-aromatic guest molecule, where M = Ni, Co and Cd, for the first time and their FT-IR and Raman spectra have been investigated. It should be noted that several unsuccessful attempts have been made to synthesize similar clathrates with benzene and benzene derivatives as guest molecules.…”