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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.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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Structural Properties
Alkyl halides are halogen-substituted alkanes wherein one or more hydrogen atoms of an alkane is replaced by a halogen atom such as fluorine, chlorine, bromine, or iodine. The carbon atom in an alkyl halide is bonded to the halogen atom, which is sp3-hybridized and exhibits a tetrahedral shape.
Unlike alkyl halides, compounds in which a halogen atom is bonded to an sp2 -hybridized carbon atom of a carbon-carbon double bond (C=C) are called vinyl halides. Whereas aryl...
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Ligand Binding Sites

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Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
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Ion Exchange01:17

Ion Exchange

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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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Halogenation of Alkenes02:46

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16.1K
Halogenation is the addition of chlorine or bromine across the double bond in an alkene to yield a vicinal dihalide. The reaction occurs in the presence of inert and non-nucleophilic solvents, such as methylene chloride, chloroform, or carbon tetrachloride.
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ortho–para-Directing Deactivators: Halogens01:24

ortho–para-Directing Deactivators: Halogens

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Halogens are ortho–para directors. They are more electronegative than carbon. Therefore, as ring substituents, they can withdraw electrons through the inductive effect and deactivate the aromatic ring towards electrophilic substitution. Halogens also have an electron-donating resonance effect on the ring, which influences the orientation of the incoming electrophile. If an electrophile attacks at the ortho or the para position, the halogen donates electrons and stabilizes the intermediate...
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Updated: Aug 11, 2025

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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Engineered Binding Microenvironments in Halogen Bonding Polymers for Enhanced Anion Sensing.

Krzysztof M Bąk1, Sophie C Patrick1, Xiaoxiong Li1

  • 1Department of Chemistry, University of Oxford, South Parks Road, Oxford, OX1 3QZ, UK.

Angewandte Chemie (International Ed. in English)
|February 7, 2023
PubMed
Summary
This summary is machine-generated.

Designing polymeric hosts with anion-receptive motifs offers a new way to detect anions in complex mixtures. These new polymer hosts show significantly enhanced anion binding compared to their single-molecule counterparts.

Keywords:
AnionsElectrochemistryHost-Guest SystemsPolymersSolvent Effects

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Area of Science:

  • Supramolecular Chemistry
  • Polymer Science
  • Anion Recognition

Background:

  • Designing synthetic hosts that mimic natural protein architectures for anion recognition in competitive media is challenging.
  • Current methods often involve complex synthetic procedures, limiting their practical application.

Purpose of the Study:

  • To develop a synthetically accessible approach for creating polymeric hosts with enhanced anion recognition capabilities.
  • To investigate the anion binding and sensing properties of novel polymeric hosts incorporating supramolecular motifs.

Main Methods:

  • Incorporation of potent supramolecular anion-receptive motifs directly into a polymeric scaffold.
  • Tuning of polymer properties through judicious selection of co-monomers.
  • Comprehensive analysis of anion recognition and sensing using redox-active, halogen bonding polymeric hosts.

Main Results:

  • Polymeric hosts demonstrated superior anion recognition compared to monomeric analogues.
  • Significant halide binding enhancements (approx. 50-fold) were observed in aqueous-organic solvent mixtures.
  • Binding enhancements were attributed to the formation of low dielectric constant microenvironments with solvent exclusion.

Conclusions:

  • Direct incorporation of anion-receptive motifs into polymer scaffolds provides a synthetically tractable route to advanced anion recognition materials.
  • These polymeric hosts offer enhanced performance in competitive media, outperforming traditional monomeric systems.
  • The design strategy effectively creates localized binding sites with reduced solvent interference, leading to improved binding affinities.