Synthesis and Molecular Structure Investigation by DFT and X-Ray Diffraction of ARNO

We report here the synthesis of (Z)-5-(4-nitrobenzyliden)-3-N(2-ethoxyphenyl)-2-thioxo-thiazolidin-4-one (ARNO) compound. The crystal structure has been determined by X-ray diffraction. The compound crystallizes in the triclinic system with space group P (1) over bar and cell parameters: a = 9.1289(19), b = 9.3717(7), c = 12.136(3) , alpha = 102.133(11)A degrees, beta = 90.99(2)A degrees, gamma = 117.165(9)A degrees, V = 895.4(3) (3) and Z = 2. The structure has been refined to a final R = 0.05 for 2591 observed reflections. The refined structure was found to be significantly non planar. The molecule exhibits intermolecular hydrogen bond of type C-Ha <-O and C-Ha <-S. ab initio calculations were also were performed at Hartree-Fock and density functional theory levels. The full HF and DFT geometry optimization was carried out using LANL2DZ, 6-31G* and B3LYP/6-31+G** basis sets. The optimized geometry of the title compound was found to be consistent structure determined by X-ray diffraction. The minimum energy of geometrical structure is obtained by using level HF/LANL2DZ basis sets.