Preparation and Characterization of New Carboxamide Ligand and its Metal Complexes

The design of new peptide ligands containing the carboxamide [-C(O)NH-] group has been continued in recent years and chemists have paid special attention to synthesis ofcarboxamide complexes of biological importance and production of therapeutic drugs [1].The deprotonated amid is a strong σ-donor capable of stabilizing early as well as late metal ions in high oxidation states [2]. Green chemistry searches for alternative, environmentally friendly reaction media and strives to increase the reaction rate and efficiency. One of the key is the replacement of hazardous solvents with Ionic liquids [3]. As part of our aim in the transition metal chemistry of dianionic ligands, we describe the synthesis and spectroscopic characterization a new ligand [H2cbqb = N,N΄- bis(quinoline- 2– carboxamido) -4- chlorobenzene], [MIIcbqb] compounds, MII = Ni, Co, Cu and a group of diaxially ligated complexes with cbqb2- as equatorial ligand [CoIII(cbqb)(L)2]X, L = CN-, N3 - ,piperidine, morpholine, benzylamine, aniline, pyridine and X= ClO4- and (n-Bu)4N+ .