Review on Organic Ligands with Their Various Applications

Abstract

There are many types of organic ligands in coordination chemistry according to type of involving functional groups [1- 9] in each structure of ligand like (- N=N-, CH=N, CH=CH-CO, -N=N-C=N, -C=C-N, etc… ),in the present review some of organic ligands with methods of their preparation : 1. Imine Ligands Imine (Schiff base, Anil, Aldamine, Ketamine, Azomethine) compounds have been synthesized via the condensation reaction of primary aromatic amine group and carbonyl groups of aldehyde or ketone to formation imine compounds like (Figure 1). A mixture of primary aromatic amine [42, 43] with aldehyde or ketone then a few drops was added of glacial acetic acid, the mixture was dissolved in ethanol as a solvent after that allow to refluxed for (1- 4) hrs, the product were poured into ice water then filtered, dried and recrystallization from ethanol solvent via thermal method, (Figure 2). A number of imine compounds [10-19] have been synthesized via the condensation reaction of primary amine group and carbonyl groups of aldehyde or ketone to formation anil (imine compounds) as a macro ligands like (Figure 3). There are two methods to preparation of Schiff base: Thermal Method- reflux)) and Microwave Method in (Figure 4). Its applications as a ligand in coordination chemistry [20, 21] with ion in complex (Figure 5). Other applications of Schiff base in tumors in medical fields (Figure 6). 2. Azo Ligands Azo compounds are considered as type of organic pigments [22-33] which consist of atleast a conjugated chromophore azo (-N=N- ) group in link with one or more aromatic or heterocyclic compound.