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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

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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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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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Ion Exchange01:17

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
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Structural Isomerism02:34

Structural Isomerism

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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
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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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Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
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Redox-Switchable Chalcogen Bonding for Anion Recognition and Sensing.

Robert Hein1, Andrew Docker1, Jason J Davis2

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Chalcogen bonding (ChB) strength is now reversibly modulated electrochemically. This breakthrough enables novel anion sensors and molecular switches by controlling ChB interactions with redox-active molecules.

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Area of Science:

  • Supramolecular Chemistry
  • Electrochemistry
  • Chemical Sensing

Background:

  • Chalcogen bonding (ChB) is a powerful noncovalent interaction, analogous to halogen bonding (XB).
  • Controlling ChB donor strength is crucial but challenging for applications.
  • Electrochemical methods offer a promising avenue for dynamic control.

Purpose of the Study:

  • To demonstrate reversible, large-scale modulation of ChB potency using electrochemical redox control.
  • To develop novel ChB-based anion sensors with tunable binding affinities.
  • To explore the potential of redox-modulated ChB in molecular switches and machines.

Main Methods:

  • Synthesis of novel bis(ferrocenyltellurotriazole) and telluroviologen receptors.
  • Electrochemical characterization using cyclic voltammetry.
  • Anion binding studies in aqueous-organic solvent mixtures.
  • Demonstration of redox-switching ON/OFF anion recognition.

Main Results:

  • Achieved reversible and large-scale modulation (up to 3 orders of magnitude) of ChB strength via redox control.
  • Developed the first ChB-mediated electrochemical anion sensors.
  • Demonstrated significant anion-binding-induced electrochemical responses, outperforming some XB and HB sensors.
  • Showcased strong coupling between redox centers and ChB donor sites.

Conclusions:

  • Electrochemical redox control provides a powerful tool for tuning ChB interactions.
  • Redox-modulated ChB enables the development of highly sensitive and tunable anion sensors.
  • This approach opens new possibilities for designing advanced molecular switches and machines.