Synthesis, crystal structure, vibrational properties and theoretical investigation of (N,N-dimethylbenzylammonium)trichlorocadmate(II)

Isostructural organic-inorganic hybrid compounds: triethylcholine tribromidocadmate and triethylcholine tribromidomercurate

In order to search for new anionic architectures and develop useful organic-inorganic hybrid materials in halometallate systems, two new crystalline organic-inorganic hybrid compounds have been prepared, i.e. catena-poly[triethyl(2-hydroxyethyl)azanium [[bromidocadmate(II)]-di-μ-bromido]], {(C8H20NO)[CdBr3]}n, (1), and catena-poly[triethyl(2-hydroxyethyl)azanium [[bromidomercurate(II)]-di-μ-bromido]], {(C8H20NO)[HgBr3]}n, (2), and the structures determined by X-ray diffraction analysis. The compounds are isostructural, crystallizing in the space group P21/n. The metal centres are five-coordinated by bromide anions, giving a slightly distorted trigonal-bipyramidal geometry. The crystal structures consist of one-dimensional edge-sharing chains of MBr5 trigonal bipyramids, between which triethylcholine counter-cations are intercalated. O-H···Br hydrogen-bonding interactions are present between the cations and anions.

Crystal structure, vibrational studies, optical properties and DFT calculations of 2-amino-5-diethyl-aminopentanium tetrachlorocadmate (II)

Single crystals of a new organic-inorganic compound (C9H24N2) CdCl4 were grown by the slow evaporation technique and characterized by X-ray diffraction, infrared absorption Raman spectroscopy scattering, optical absorption, differential scanning calorimetry (DSC) analysis and dielectric measurements. The title compound belongs to the orthorhombic space group Pbca with the following unit cell parameters: a=11.397(7), b=13.843(4), c=22.678(5)Å and Z=8. In crystal structure, the tetrachlorocadmate anion is connected to organic cations through N-H⋯Cl hydrogen bonds. Theoretical calculations were performed using density functional theory (DFT) with the B3LYP/LanL2DZ level of theory for studying the molecular structure and vibrational spectra of the title compound. Good consistency is found between the calculated results and the experimental structure, IR, and Raman spectra. The detailed interpretation of the vibrational modes was carried out on the basis on our DFT calculations as primary source of assignment and by comparison with spectroscopic studies of similar compounds. The optical properties were investigated by optical absorption and show three bands at 300, 329 and 513 nm.