Carboxamide ligands have been part of the growing research in the field of coordination chemistry of transition metal complexes. The solvent used in classical method of synthesis of these compound is pyridine, a solvent which extremely toxic. At the first part in this thesis a new tridentate carboxamid ligand N- quinolin-8-yl-indol-carboxamide (H 2 IQ) and a new bidentate carboxamid ligand Naphthalene -1- carboxylic acid quinolin-8-yl-amid (HNQ) were synthesized by begin method using ionic liquid as the reaction media .The HNQ ligand acts as a bidentate ligand and coordinates the basal positions through quinolone and nitrogen atoms and purity and spectral properties of ligands and complex have been investigated by elemental analysis: FT-IR ،UV-Vis ،H NMR، CHN , X-ray diffraction. The coordination geometry around the central metal ion in copper complex is distorted tetrahedron. In continuation of this work, ligands H 2 IQ and HNQ have been investigated by UV-Vis spectroscopy and molecular fluorescent spectroscopy .The results show that ligands HNQ and H 2 IQ can be used as fluorescent sensor for detection of Fe 3+ ion in the presence of different metal ions. In addition both ligands change color from colorless to yellow by addition Fe 3+ in the presence of other metal ions. So they are suitable as colorimetric sensor for Fe 3+ ion.