Synthesis, structural and optical properties of novel 3-(3,5-dimethyl-1H-pyrazol-1-yl)-1-(diphenylphosphino)-2-((diphenylphosphino)methyl)-3-methylbutanone-1,2-diphenylethane-1,2-diamine tungsten dicarbonyl (PyrPMB-W) nanostructure thin film

In this paper, a novel transition metal complex, 3-(3,5-dimethyl-1H-pyrazol-1-yl)-1-(diphenylphosphino)-2-((diphenylphosphino)methyl)-3-methylbutanone-1,2-diphenylethane-1,2-diamine tungsten dicarbonyl (PyrPMB-W) was synthesized and characterized using IR, mass spectra MS (FAB), 1H and 1H{31P} NMR spectra. The thermal evaporation technique was successfully used to deposit highly uniform and good adhesion of PyrPMB-W thin film. The structural properties of PyrPMB-W were studied by X-ray diffraction (XRD). The results indicate that the complex was well polycrystalline and corresponds to space group P21/c with a monoclinic crystal structure. The important absorption parameters such as molar extinction coefficient (εmolar), the oscillator strength (f), and the electric dipole strength (q2) were also calculated. The analysis of the spectral behavior of the absorption coefficient in the intrinsic absorption region reveals a directly allowed transition with a band gap of 1.87 eV. The dispersion of the refractive index is discussed in terms of the single oscillator Wemple-Didomenico (WD) model. The single oscillator energy (E0), the dispersion energy (Ed), the high frequency dielectric constant (ε∞), the lattice dielectric constant (εL) and the ratio of the free charge carrier concentration of the effective mass (N/m∗) were estimated. From the optical constant analysis, the optical conductivity, volume and surface energy loss functions were reported. Structural and optical mechanisms were discussed for future applications in nanoscaled optoelectronic devices.