Structural, vibrational and DSC investigations of the bis-4-benzyl piperidinium tetraoxoselenate monohydrate crystal

Crystal structure, vibrational studies and optical properties of a new organic-inorganic hybrid compound (C₁₀H₂₈N₄)CuCl₅Cl⋅4H₂O

A new organic-inorganic hybrid material, 1,4-bis(3-ammoniumpropyl) piperazinium pentachloridocuprate(II) chloride tetrahydrate [(C₁₀H₂₈N₄)CuCl₅Cl⋅4H₂O], has been synthesized and characterized by X-ray diffraction, UV-visible absorption, Infrared and Raman spectroscopy. The compound crystallizes in the orthorhombic system and Pnma space group with a=8.18 (3)Å, b=10.96 (5)Å, c=21.26 (9)Å, V=2254.3 (15)Å(3). In this structure, the Cu(2+) ion, surrounded by five chlorides, adopts the square pyramidal coordination geometry. The structure of this compound consists of tetraprotonated 1,4-bis(3-ammoniumpropyl) piperazinium cations and the anionic sublattice is built up of isolated, square pyramid [CuCl₅](3)(-) units, chloride ion Cl(-) and water molecules connected with each other by hydrogen bonds. Organic and inorganic entities are interconnected by means of hydrogen bonding contacts [NH⋯O(Cl), O(W)H⋯Cl and O(W)H⋯O]. Furthermore, the room temperature IR and Raman spectra of the title compound were recorded and analyzed on the basis of literature data. The optical study was also investigated by UV-Vis absorption. In fact, the organic-inorganic hybrid crystal thin film can be easily prepared by spin-coating method from the ethanol solution of the (C₁₀H₂₈N₄)CuCl₅Cl⋅4H₂O hybrid compound and it showed absorptions characteristics of CuCl based layered compounds centered at 275 and 374 nm.

Crystal structure and vibrational spectral studies of a new organic-inorganic crystal: 4-Benzylpiperidinium trioxonitrate

Single crystals of a new organic-inorganic crystal, 4-benzylpiperidinium trioxonitrate (4-BPPN) were grown by slow evaporation at room temperature and were characterized by X-ray diffraction, DTA-TG measurement, FT-IR and FT-Raman spectroscopies. The title compound crystallizes in the monoclinic system P21/c at room temperature with the following parameters: a=12.787(8)Å, b=9.007(5)Å, c=11.120(5)Å, β=95.974(2)° and Z=4. Its crystal structure is packing of alternated inorganic and organic layers parallel to (a, c) planes. The different components are connected by a bi-dimensional network of N-H⋯O hydrogen bonds. The ability of ions to form spontaneous three-dimensional structure through N-H⋯O hydrogen bond is fully utilized. These hydrogen bonds give notable vibrational effects. The optimized molecular structure and the vibrational spectra were calculated by the Density Functional Theory (DFT) method using the B3LYP function with the 6-31G(d) basis set. All observed vibrational bands have been discussed and assigned to normal mode or to combinations on the basis of our DFT calculations as a primary source of attribution and also by comparison with the previous results for similar compounds. Good consistency is found between the calculated results and the experimental structure, IR, and Raman spectra.