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Articles

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

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Pages 1265-1272 | Received 28 Aug 2021, Accepted 16 Jan 2022, Published online: 10 Mar 2022
 

Abstract

The hexamethyl tetraazacyclotetradecadiene diperchlorate ligand salt, Me6[14]diene.2HClO4 (L1.2HClO4) on reduction yielded two isomeric C-chiral ligands “tet-a” and “tet-b”. Open air reactions of the ligands, L1.2HClO4, “tet-a,” and “tet-b” with vanadyl acetylacetonate produced octahedral green complexes, [VOL1(acac)](ClO4), [VO(“tet-a”)(H2O)](ClO4)2, and [VO(“tet-b”)(acac)](ClO4), respectively, in which vanadium was in +4 oxidation state. The complex [VOL1(acac)](ClO4) underwent axial substitution with KCNS, KBr, KI, and NaNO2 in the ratio of 1:12 in ethanol to yield axial substitution products, [VOL1(SCN)](ClO4)2, [VOL1Br](ClO4)2, [VOL1I](ClO4)2, and [VOL1(NO2)](ClO4)2, respectively, in which vanadium was in +5 oxidation state. On the other hand, [VO(“tet-b”)(acac)](ClO4) 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]Br2, 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.

Additional information

Funding

The authors would like to extend their sincere appreciation to the Ministry of Education, Bangladesh, to sanction a research grant to Professor Dr. Tapashi Ghosh Roy and Professor Dr. Debashis Palit Department of Chemistry, University of Chittagong, Chittagong-4331, Bangladesh.

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