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Formation of Complex Ions03:45

Formation of Complex Ions

A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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Published on: March 24, 2018

Solute-solvent halogen bonding during adsorption on silver nanostructures.

Donald A Perry1, Taylor M Razer, James S Cordova

  • 1Department of Chemistry, University of Central Arkansas, Conway, AR 72035, USA. donp@uca.edu

Journal of Colloid and Interface Science
|April 10, 2012
PubMed
Summary

Silver nanoparticles (SNPs) induce halogen bonding in multilayer films. This interaction facilitates the inclusion of carbon tetrachloride (CCl4) within 4-iodobenzoate ion (4IBI) multilayers, impacting thin film nucleation.

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Area of Science:

  • Nanomaterials Science
  • Surface Chemistry
  • Spectroscopy

Background:

  • Halogen bonding is a known intermolecular interaction in various chemical systems.
  • The role of nanoparticles in mediating such interactions in thin films is less understood.
  • Previous studies focused on solution, bulk, or monolayer systems.

Purpose of the Study:

  • To provide evidence for halogen bonding induced by silver nanoparticles (SNPs).
  • To investigate the formation of 4-iodobenzoate ion (4IBI) and carbon tetrachloride (CCl4) interactions in multilayer films.
  • To explore the significance of halogen bonding in thin film nucleation.

Main Methods:

  • Surface-Enhanced Raman Spectroscopy (SERS) for monolayer analysis.
  • Surface-Enhanced Infrared Absorption (SEIRA) spectroscopy for multilayer characterization.
  • Infrared spectroscopy on clean BaF(2) substrates.

Main Results:

  • SNPs induce halogen bonding in multilayer films containing 4IBI and CCl4.
  • CCl4 does not adsorb on its own, and 4-iodobenzoic acid (4IBA) adsorbs as 4IBI on SNPs.
  • 4IBI formation on SNPs is crucial for CCl4 inclusion in the multilayer.

Conclusions:

  • Halogen bonding interactions are significant in multilayer films, mediated by SNPs.
  • The findings extend the understanding of halogen bonding beyond solution and monolayer systems.
  • This work has implications for thin film nucleation and related applications.