In this Thesis, the unsymmetrical bidentate ligand 4-cyano-N-(quinolin-8-yl) benzamide (Hcqb) (1) was synthesized using the TBAB ionic liquid as the reaction medium. The copper complex of Hcqb (1) ligand has been synthesized and characterized by elemental analysis: FT-IR, UV-Vis spectroscopy. Additionally, the crystal structure of [Cu ? (cqb) 2 ] (2) complex has been determined by X-ray diffraction. The anionic cqb ¯ acts as bidentate ligand coordinating to the central metal through quinolin and amide nitrogen atoms. The [Cu ? (cqb) 2 ] (2) has a distorted tetrahedral geometry around the central metal ion. The bond length of Cu1-N1 (quinolyl) , Cu1-N2 (amido), Cu1-N4 (quinolyl), Cu1-N5 (amido) are 1.976(19), 1.957(2), 1.980(2), and 1.956 ? respectively. The electrochemical behavior of the ligand and its copper complex has bee investigated. The cyclic voltammogram of this complex shows a peak at -0.32 V corresponding to quasi-reversible reduction of Cu II/I and a second peak at -0.24 V corresponding to the quasi-reversible oxidation of Cu (I) to Cu (II). [Cu ? (cqb) 2 ] complex was employed as a novel precursor for the synthesis of CuO nanoparticles by thermal decomposition process. The CuO nanoparticles were characterized by X-ray diffraction (XRD), Field Emission Scanning Electron Microscopy (FE-SEM) infrared (IR) spectroscopy and ultraviolet–visible (UV-Vis) spectroscopy. The thermogravimetric analysis (TG-DTG-DSC) of [Cu ? (cqb) 2 ] was also carried out and investigated. The photophysical behavior of ligand towards various cations was investigated. The ligand showed remarkable selectivity toward aluminum ions relative to other metal ions.