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Complexation Equilibria: Factors Influencing Stability of Complexes01:09

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In complexation reactions, metal cations are the electron pair acceptors, and the ligands are the electron pair donors. The stability of the metal complexes depends primarily on the complexing ability of the central metal ion and the nature of the ligands. Generally, the complexing ability of the metal ion depends on the size and charge of the ion. As the metal ion size increases, the stability of the metal complexes decreases, provided that the valency of the metal ion and the ligands remain...
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The effectiveness of antimicrobial agents depends on various factors influencing their ability to eliminate microbial populations. Larger microbial populations require more time for complete eradication, emphasizing the importance of population size analysis when evaluating antimicrobial efficacy.Microbial resistance to antimicrobial agents varies significantly. Highly resilient microorganisms include endospores, gram-negative bacteria, and non-enveloped viruses, while prions are exceptionally...
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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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Antimicrobial proteins are important components of the immune system. They aid the body in combating pathogens by either killing them directly or hindering their replication processes. Four main types of antimicrobial substances are interferons, the complement system, iron-binding proteins, and antimicrobial proteins.
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In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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Antimicrobial Agents Based on Metal Complexes: Present Situation and Future Prospects.

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Antimicrobial resistance is a growing threat, diminishing antibiotic effectiveness. Metal complexes show promise as novel antibiotics against resistant bacteria and fungi.

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Area of Science:

  • Medicinal Chemistry
  • Microbiology
  • Materials Science

Background:

  • Antimicrobial resistance (AMR) poses a significant global health threat, reducing the efficacy of existing antibiotics.
  • Many microbes, including Gram-positive and Gram-negative bacteria and microfungi, exhibit reduced susceptibility to current antimicrobial drugs.
  • The development of novel antimicrobial agents is crucial to combat the escalating challenge of AMR.

Purpose of the Study:

  • To review the current status and future potential of metal complexes as antimicrobial agents.
  • To explore the application of metal complexes in combating a wide spectrum of microbial infections.
  • To highlight the role of metal-based drugs in addressing the challenge of antibiotic resistance.

Main Methods:

  • Literature review of studies on metal complexes with antimicrobial activity.
  • Analysis of research on the development of metal-based drugs.
  • Synthesis and characterization of novel metal complexes for antimicrobial screening (implied).

Main Results:

  • Metal complexes have demonstrated potential as effective antimicrobial agents.
  • Metal-based drugs derived from complexes show activity against various pathogens.
  • Research indicates a historical and ongoing interest in metal complexes for therapeutic applications.

Conclusions:

  • Metal complexes represent a promising avenue for developing new antibiotics to combat antimicrobial resistance.
  • Further research into metal complexes could lead to novel therapeutic strategies against resistant microbial infections.
  • The review underscores the importance of exploring metal-based compounds for future antimicrobial drug discovery.