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Selective Copper(II) Complexes against Mycobacterium tuberculosis.

Kaíque A D'Oliveira1, Nícolas Glanzmann2, Adilson D da Silva2

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Five novel quinoline derivatives and their copper complexes show potent activity against Mycobacterium tuberculosis (Mtb). The Cu-ACQophen complex displays significant antitubercular efficacy with a high selectivity index, indicating therapeutic potential.

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Area of Science:

  • Coordination Chemistry
  • Medicinal Chemistry
  • Materials Science

Background:

  • Tuberculosis (TB) remains a significant global health challenge, necessitating the development of new therapeutic agents.
  • Quinoline derivatives and their metal complexes are explored for diverse biological activities, including antimicrobial properties.
  • Understanding structure-activity relationships is crucial for designing effective antitubercular compounds.

Purpose of the Study:

  • To synthesize and characterize novel quinoline derivatives and their copper(II) complexes.
  • To evaluate the in vitro biological activity of these compounds against Mycobacterium tuberculosis (Mtb).
  • To investigate the structural and electronic properties influencing their antitubercular efficacy.

Main Methods:

  • Synthesis of five quinoline derivatives (DCQ, ACQ12, ACQ13, ACQ14, ACQophen) and their copper(II) complexes.
  • Structural characterization using single-crystal and powder X-ray diffraction (PXRD).
  • Spectroscopic analyses (IR, Raman, UV-vis) and Density Functional Theory (DFT) calculations.
  • Biological evaluation of antitubercular activity and determination of selectivity indexes (SI).

Main Results:

  • Successful synthesis and characterization of quinoline derivatives and their copper complexes with varying stoichiometries and coordination geometries.
  • Cu-ACQophen complex demonstrated potent antitubercular activity (MIC90 ≈ 1.68 μmol L⁻¹) and a high selectivity index (SI = 48).
  • Other complexes, including Cu-DQC and Cu-ACQ12, also exhibited promising selectivity indexes (>10).

Conclusions:

  • The synthesized quinoline derivatives and their copper complexes represent a promising class of compounds for antitubercular drug development.
  • The Cu-ACQophen complex shows significant potential as a lead compound due to its high efficacy and selectivity.
  • Further research into these metal-organic compounds could lead to novel strategies for combating tuberculosis.