Alkali Metal Complexes of an Octamethyl Isomeric Macrocycle: Synthesis, Characterization and Antimicrobial Studies

Fourteen membered octamethyl tetraazamacrocyclic ligand salt, Me8[14]diene·2HClO4 and three isomeric ligands (LA, LB and LC) of its saturated analog have been synthesized as per literature. Interaction between the isomeric ligand LB and KX (X = SCN, NO3, Cl, Br and I) afforded white-coloured five coordinated square pyramidal potassium complexes [KLBX]. Moreover, the reaction between RbCl and LB produced five coordinated [RbLBCl] having square pyramidal geometry. Then, the axial substitution reaction on [RbLBCl] furnished a substituted rubidium complex with the same geometry of the mother complex. All the alkali metal complexes have been characterized by using modern analytical techniques. Furthermore, antibacterial and antifungal activities of ligand LB and its alkali metal (K and Rb) complexes have been investigated against different bacteria and fungi.