“…Pentagonal-bipyramidal complexes of 2,6-diacetylpyridine bis(acylhydrazone) ligands have a wide spectrum of biological activities: cytotoxic [11], antimicrobial [9,10,13], SOD mimetic [14][15][16], DNA/RNA binding and nuclease activity [8,17,18]. In the previously published papers [19][20][21], synthesis, characterization and antimicrobial activity of 2,2'- [2,6-pyridinediylbis(ethylidyne-1-hydrazinyl-2-ylidene)]bis[N,N,N-trimethyl-2-oxoethanaminium] dichloride (H2LCl2) and its corresponding Mn(II) (1), Ni(II) (2), Co(II) (3 and 4), Zn(II) (5) and…”