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The hexamethyl tetraazacyclotetradecadiene diperchlorate ligand salt, Me 6 [14]diene.2HClO 4  (L 1 .2HClO 4 ) on reduction yielded two isomeric C-chiral ligands “tet-a” and “tet-b”. Open air reactions of the ligands, L 1 .2HClO 4 , “tet-a,” and “tet-b” with vanadyl acetylacetonate produced octahedral green complexes, [VOL 1 (acac)](ClO 4 ), [VO(“tet-a”)(H 2 O)](ClO 4 ) 2 , and [VO(“tet-b”)(acac)](ClO 4 ), respectively, in which vanadium was in +4 oxidation state. The complex [VOL 1 (acac)](ClO 4 ) underwent axial substitution with KCNS, KBr, KI, and NaNO 2  in the ratio of 1:12 in ethanol to yield axial substitution products, [VOL 1 (SCN)](ClO 4 ) 2 , [VOL 1 Br](ClO 4 ) 2,  [VOL 1 I](ClO 4 ) 2 , and [VOL1(NO 2 )](ClO 4 ) 2 , respectively, in which vanadium was in +5 oxidation state. On the other hand, [VO(“tet-b”)(acac)](ClO 4 ) underwent simultaneous axial substitution and anion exchange reactions with KCNS and KBr in the same ratio to furnish corresponding vanadium(V) complexes, [VO(“tet-b”)(SCN)](SCN) 2  and [VO(“tet-b”)Br]Br 2 , respectively. These complexes were characterized on the basis of elemental, spectroscopic, magneto-chemical, and conductometric analyses. The antibacterial activities of the ligands and their complexes have been investigated toward different Gram-positive and Gram-negative bacteria.

Synthesis, characterization, and antibacterial studies of some vanadium complexes with hexamethyl tetraazamacrocycles