Keywords: Schiff base, Complex, Transition metal, hydrazine, naphthene 1.0 Background information Coordination compound(s) is a catalogue of compounds consisting of ligand(s) bonded to the central metal ion through coordinate covalent bond . The element in the ligand that is directly bonded to central metal ion is known as the donor atom. A donor atom usually possesses a lone pair of electron with which it can bond to the central metal atom via coordinate covalent bonding.