Novel antimony(iii) hydroxamic acid complexes as potential anti-leishmanial agents

Area of Science:

• Coordination Chemistry
• Medicinal Chemistry
• Parasitology

Background:

• Hydroxamic acids are versatile ligands in coordination chemistry.
• Antimony complexes have historical significance in treating leishmaniasis.
• Novel antimony(III) complexes were synthesized to explore their anti-leishmanial potential.

Purpose of the Study:

• To synthesize and characterize novel antimony(III) hydroxamato complexes.
• To evaluate the in vitro anti-leishmanial activity of these complexes against Leishmania species.
• To investigate the mechanism of action and identify promising candidates for drug development.

Main Methods:

• Synthesis of antimony(III) complexes using various hydroxamic acids (Bha, 2-pyha, 2-NH2-pha, Sha, SAHA) and antimony precursors (SbCl3, Sb(OEt)3).
• Characterization of complexes through standard chemical methods.
• In vitro anti-leishmanial assays evaluating promastigote proliferation, morphological changes, plasma membrane permeability, and mitochondrial dehydrogenase activity.

Main Results:

• Novel hydroxamato antimony(III) complexes were successfully synthesized.
• All tested complexes demonstrated significant inhibition of Leishmania promastigote proliferation and induced morphological alterations.
• Complex [Sb(Bha-1H)2Cl] showed the highest activity, while [Sb(2-NH2-pha-1H)(2-NH3-pha-1H)]Cl23 exhibited favorable selectivity for further investigation.

Conclusions:

• Antimony(III) hydroxamato complexes possess potent anti-leishmanial properties.
• The observed effects include disruption of parasite membrane integrity and metabolic activity.
• Complex [Sb(2-NH2-pha-1H)(2-NH3-pha-1H)]Cl23 is a promising candidate for further development as an anti-leishmanial drug.