Crystal Growth, Structural and Optical Characterization of Lanthanum Chloride Urea–Thiourea Semi-organic Complex

Abstract

Preparation of materials in the form of single crystals has remained a subject of interest in the field of semiconductor and optoelectronic industry. In recent times, the organic and compound semiconductors have received keen interest in high frequency, high power electronics and optoelectronic applications. In present work, the crystal growth, structural and optical properties of lanthanum chloride urea–thiourea semiorganic complex is reported. The titled complex is grown in single crystal form by solution method. The solution grown crystals were subjected to single crystal X-ray diffraction that establishes the orthorhombic structure for the complex with lattice parameters a = 7.676 A, b = 8.564 A, c = 5.498 A, α = β = γ = 90° and centerosymmetric space group Pnma. Fourier transform infra red spectroscopy establishes the functional groups and structure of the complex. The UV-VIS absorption spectra consists of two strong absorption peaks at 224 and 277 nm that are assigned to π − π* and n − π* transitions occurring in the complex. The grown crystals are characterized as the direct band gap materials with band gap value in the range 4.12–4.76 eV.