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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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Microbial biosensors are analytical devices that utilize living microbes to detect specific substances through measurable signals. These devices consist of two main components: biosensing organisms and signal-transducing elements. Biosensing organisms, such as Escherichia coli or Saccharomyces cerevisiae, are typically housed in multiwell plates connected to transducers, enabling rapid, real-time detection of target analytes.Signal Generation MechanismWhen a target analyte—such as...
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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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Microbiologically Influenced Corrosion (MIC) is a significant form of material degradation caused by the metabolic activities of microorganisms. This phenomenon poses substantial challenges across various industries, including oil and gas, maritime, and water treatment sectors.MIC occurs when microorganisms, such as bacteria, archaea, and fungi, colonize metal surfaces, forming biofilms that alter the local electrochemical environment. These biofilms can lead to the production of corrosive...
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Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
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Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides
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Macrocyclic metal complexes for metalloenzyme mimicry and sensor development.

Tanmaya Joshi1, Bim Graham2, Leone Spiccia1

  • 1†School of Chemistry, Monash University, Victoria 3800, Australia.

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|August 6, 2015
PubMed
Summary

This study reviews macrocyclic metal complexes using 1,4,7-triazacyclononane (tacn) and 1,4,7,10-tetraazacyclododecane (cyclen) ligands. These models mimic metallobiosites for biomolecule sensing, diagnosis, and therapy.

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Area of Science:

  • Bioinorganic Chemistry
  • Coordination Chemistry
  • Biomimetic Chemistry

Background:

  • Proteins utilize metal ions for diverse functions, with coordination environments often involving protein residues, exogenous ligands, or porphyrin units.
  • Low-molecular-weight macrocyclic metal complexes serve as valuable models for metallobiosites, replicating metal ion coordination without the protein framework.

Purpose of the Study:

  • To review research on metal complexes formed by 1,4,7-triazacyclononane (tacn) and 1,4,7,10-tetraazacyclododecane (cyclen) ligands in biological inorganic chemistry.
  • To explore their application in developing models for metallobiosites and potential uses in sensing, diagnosis, and therapy.

Main Methods:

  • Utilizing kinetically inert and thermodynamically stable metal complexes of tacn and cyclen derivatives.
  • Developing "coordinatively unsaturated" complexes with weakly bound ligands for reversible guest molecule binding.
  • Creating simplified structural models for multimetallic enzyme sites using tacn-based complexes.
  • Investigating Zn(II)-imido and Zn(II)-phosphate interactions in Zn-cyclen systems for chemosensors.

Main Results:

  • Demonstrated structural comparisons between multinuclear copper(II) complexes and multicopper enzymes (e.g., ascorbate oxidase, laccase).
  • Highlighted cooperativity in metal centers or metal-ligand units for efficient phosphate ester cleavage.
  • Showcased sensitive electrochemical and fluorescent chemosensors based on Zn-cyclen systems.

Conclusions:

  • Macrocyclic metal complexes offer robust platforms for mimicking metallobiosites and understanding biological metal ion interactions.
  • These complexes show promise in biomolecule sensing, diagnosis, and therapy, particularly "coordinatively unsaturated" variants.
  • Further development is needed to overcome limitations in synthetic nuclease performance and biosensor applications.