The cyano-bridged heteronuclear polymeric complex, [Cd(teta)Ni(l-CN) 2 (CN) 2 ] Á 2H 2 O (1), (teta = triethylenetetraamine) was synthesized and characterized by FT-IR spectroscopy, thermal analysis and single crystal X-ray diffraction techniques. It crystallizes in the orthorhombic system, space group Pccn. The asymmetric unit also contains two uncoordinated water molecules. The coordination geometry around the Cd(II) centre is a highly distorted octahedral. In the crystal structure, intramolecular N-HÁÁÁO and intermolecular N-HÁÁÁO, O-HÁÁÁO and O-HÁÁÁN hydrogen bonds, beside the cyano-bridged chains made up of tetracyanonickelate ions coordinated to Cd(II) ions, where the Ni(II) ion is coordinated by four cyanoligands in a square-planar arrangement, link the molecules into polymeric networks parallel to (001) plane, where the hydrogen bonded water molecules occupy the cavities between the layers. The FT-IR spectrum was reported in the 4,000-400 cm -1 region. Vibration assignments were given for all the observed bands and the spectral feature also supported the structure of the polymeric complex. The decomposition reaction takes place in the temperature range 20-1,000°C in the static air atmosphere.
Polycrystalline CuInS 2 films have been grown by spray pyrolysis method at different substrate temperatures, a simple method which can produce low cost and highly absorbing samples. Optical characteristics of the CuInS 2 films have been analyzed using spectrophotometer in the wavelength range of 400 -900 nm. The absorption spectra of the films showed that this compound is a direct band gap material and gap values varied between 1.51 -1.80 eV, depending on the substrate temperatures. The refractive index n, extinction coefficient k and dielectric constants ε 1 and ε 2 were also discussed and calculated as a function of wavelength λ.
Cadmium sulfide (CdS) films have been formed using an ultrasonic spray pyrolysis method. These films were annealed at a temperature range of 200-500 o C in air for 5 hours. To investigate the effects of annealing on the vibrational, structural, optical and morphological properties of cadmium sulfide films, X-ray diffraction (XRD), Raman spectroscopy, Fourier transform infrared (FTIR) spectroscopy, UV-visible spectroscopy (UV-vis) and atomic force microscopy (AFM) were used, respectively. The XRD spectra indicated that the films have polycrystalline hexagonal nature. According to XRD results, increase in the annealing temperature causes an increase in crystallite size. The optical band gap of the CdS films have been calculated at different annealing temperatures and are found to be in the range of 2.40-2.44 eV. Raman results exhibited two peaks attributed to the 1LO (300cm-1) and 2LO (601cm-1) modes of hexagonal CdS. The chemical bonding has been analyzed by FTIR spectra. The vibrational peaks in the FTIR spectra of the films located at 550-715 and 844-1160 cm-1 correspond to the Cd-S and CO phonon modes, respectively. The morphological properties of all the films were determined by AFM images. The annealing temperature caused a change in color images of films.
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