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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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Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked.  In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence...
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Impact01:30

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Impact occurs when two bodies collide, leading to the application of impulsive forces between them. Analyzing impact mechanics involves considering two colliding particles moving along a line known as the line of impact, which passes through their centers and is perpendicular to the contact plane.
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A Technique to Functionalize and Self-assemble Macroscopic Nanoparticle-ligand Monolayer Films onto Template-free Substrates
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Ligand Impact on Monolayer Electrochromic Material Properties.

Nadia O Laschuk1, Iraklii I Ebralidze1, Jade Poisson1

  • 1Faculty of Science , University of Ontario Institute of Technology , 2000 Simcoe Street North , Oshawa , Ontario L1H 7K4 , Canada.

ACS Applied Materials & Interfaces
|September 20, 2018
PubMed
Summary

Researchers developed durable electrochromic materials using iron complexes on conductive supports. Minor ligand modifications tune color and electronic properties for advanced applications.

Keywords:
color switchcoordination complexeselectrochromic materialsterpyridine ligandstransition metals

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Surface Chemistry

Background:

  • Electrochromic materials are crucial for smart windows and displays.
  • Developing highly stable and tunable electrochromic materials remains a challenge.

Purpose of the Study:

  • To create efficient, durable electrochromic materials with tunable colors.
  • To investigate the impact of ligand design on material properties.

Main Methods:

  • Anchoring monolayers of iron complexes onto surface-enhanced conductive supports.
  • Optimizing substrate thickness for optical density changes.
  • Utilizing mono- and bis-quaternization to control complex alignment and electronic properties.
  • Employing density functional theory (DFT) calculations.

Main Results:

  • Achieved materials with excellent redox and lifetime stability, high contrast ratios, and superior electron-transfer constants.
  • Demonstrated color tuning (green, purple, brown) through subtle changes in ligand sterics and electronics.
  • Showed that ligand architecture dictates complex alignment (orthogonal/parallel) via quaternization.
  • Observed predictable shifts in photoabsorption peaks based on quaternization and ligand properties.

Conclusions:

  • A well-defined method for electrochromic material color tuning via ligand manipulation was established.
  • The study provides a pathway to engineer a wide spectrum of electrochromic materials with tailored properties.