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Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR
Published on: December 16, 2013
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Copper(II)-N-hydroxy-N,N'-diarylformamidine complexes: Synthesis, crystal structures, antibacterial and molecular
Wisdom A Munzeiwa1, Segun D Oladipo2, Collins U Ibeji3
1School of Chemistry and Physics, Westville Campus, University of Kwazulu-Natal, Private Bag X54001, Durban 4000, South Africa; Chemistry Department, Bindura University of Science Education, P Bag 1020, Bindura, Zimbabwe.
Journal of Inorganic Biochemistry
|September 10, 2021
Summary
Four new copper(II) complexes were synthesized and tested for antimicrobial activity. Complex 1 showed excellent activity against Gram-positive bacteria, while complex 2 exhibited good binding affinities in molecular docking studies.
Area of Science:
- Coordination Chemistry
- Inorganic Chemistry
- Antimicrobial Agents
Background:
- N-hydroxy-N,N'-diarylformamidines are versatile ligands for metal complex synthesis.
- Copper(II) complexes are explored for their diverse biological activities.
- Understanding structure-activity relationships is crucial for developing new antimicrobial drugs.
Purpose of the Study:
- To synthesize and characterize novel copper(II) complexes using N-hydroxy-N,N'-diarylformamidine ligands.
- To evaluate the antimicrobial potential of these complexes against Gram-negative and Gram-positive bacteria.
- To investigate the binding interactions of the complexes with biological targets using molecular docking.
Main Methods:
- Synthesis of four mononuclear copper(II) complexes ([Cu-(L)2]) using N-hydroxy-N,N'-diarylformamidine ligands (L1-L4) and copper acetate.
- Structural characterization of complexes 3 and 4 using single crystal X-ray diffraction, revealing square planar geometry.
- Antimicrobial activity testing against S. typhimurium, P. aeruginosa, E. coli, MRSA, and S. aureus, with ciprofloxacin as a reference.
- Molecular docking studies to predict binding modes and affinities with protein targets.
Main Results:
- All synthesized copper(II) complexes exhibited square planar geometry.
- Complexes were largely inactive against Gram-positive bacteria, with the exception of complex 1, which showed significant activity against S. aureus and MRSA, comparable to ciprofloxacin.
- Molecular docking indicated that hydrogen bonding, pi-sigma, and van der Waals interactions are key in complex-protein binding, with complex 2 demonstrating strong binding affinities.
Conclusions:
- The synthesized copper(II) complexes show selective antimicrobial activity, particularly complex 1 against Gram-positive bacteria.
- Structural and computational analyses provide insights into the mechanism of action and potential for drug development.
- Further research into these complexes could lead to novel antimicrobial agents targeting resistant bacterial strains.
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