Synthesis, spectral, thermal, optical dispersion and dielectric properties of nanocrystalline dimer complex (PEPyr-diCd) thin films as novel organic semiconductor

Dimer complex PEPyr-diCd (5a) has been prepared by reacting CdCl(2)a <...2.5H(2)O with 1,1'-bis(diphenylphosphino)ethyl-6-methyl-3-(pyridin-2-yl)-1,4-dihydro-pyridazine tungsten tetracarbonyl PEPyr (4a) as bipyridine ligand. The structural properties of PEPyr-diCd complex were characterized on the basis of elemental analysis (EA), Fourier transform infrared spectra, fast atom bombardment-mass spectrometry, thermogravimetric/differential thermal analysis, and (1) H nuclear magnetic resonance spectroscopy. The crystal is orthorhombic, space group Pbca. Cd(II) metal in PEPyr-diCd organic semiconductor complex coordinated with two N of the PEPyr and three Cl (-) (one terminal and two bridging). The micro-structural properties of the films were studied via X-ray diffraction, and scanning electron microscopy. The as-deposited films were annealed in air for 1 h at 150, 200, and 250 (a similar to) C. An average transmittance a parts per thousand yen 70% for PEPyr-diCd complex at higher wavelength a parts per thousand yen 800 nm was observed. In UV spectrum, the transmittance increases followed by a sharp decrease at wavelength 700-750 nm within visible range. The results of the absorption coefficient were determined to find the binding energy (E (B) ) of PEPyr-diCd organic semiconductor complex as 0.242 and 0.47 eV, respectively. Refractive index (n) and absorption index (K) of PEPyr-diCd complex were calculated. Moreover, the dispersion parameters such as dispersion energy, oscillator energy, dielectric constant, and dissipation factor were determined. The oxidation of the imino-phosphine derivatives were examined using cyclic voltammetry in methylene chloride solvent. The cyclic voltammogram of PEPyr-diCd (5a) organic semiconductor appears to have two quasi-reversible oxidations at 543 and 441 mV. The obtained results indicate that the PEPyr-diCd organic semiconductor thin film is a good candidate in optoelectronic devices based on its band gap and dispersion parameters.