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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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Reductive Electropolymerization of a Vinyl-containing Poly-pyridyl Complex on Glassy Carbon and Fluorine-doped Tin Oxide Electrodes
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Redox-Active Ligands: An Advanced Tool To Modulate Polyethylene Microstructure.

W Curtis Anderson1, Jennifer L Rhinehart1, Andrew G Tennyson2

  • 1Department of Chemistry, University of Tennessee , Knoxville, Tennessee 37996, United States.

Journal of the American Chemical Society
|January 2, 2016
PubMed
Summary
This summary is machine-generated.

This study demonstrates that redox-active catalysts can control polyethylene microstructure during polymerization. Adding chemical reductants in situ allows for precise modulation of branching density up to 30%.

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Area of Science:

  • Polymer Chemistry
  • Catalysis
  • Materials Science

Background:

  • Controlling polymerization through catalyst modification is crucial for tailoring polymer properties.
  • In situ catalyst modulation offers a dynamic approach to polymerization control.

Purpose of the Study:

  • To investigate the use of redox-active catalysts for synthesizing high molecular weight polyethylene.
  • To demonstrate the ability to control polyethylene microstructure, specifically branching density and identity, via ligand-based redox chemistry.

Main Methods:

  • Synthesis of polyethylene using catalysts bearing redox-active moieties.
  • In situ addition of chemical reductants to the polymerization reactor.
  • Characterization of polyethylene using Gel Permeation Chromatography (GPC) and Nuclear Magnetic Resonance (NMR) spectroscopy.

Main Results:

  • Successful synthesis of high molecular weight polyethylene.
  • Demonstrated ability to modulate branching density by up to approximately 30% through in situ reductant addition.
  • Evidence of ligand-based redox chemistry influencing polymer microstructure.

Conclusions:

  • Catalysts with redox-active moieties provide a powerful tool for enhanced polymerization control.
  • In situ modulation of catalyst oxidation state via reductants enables precise tailoring of polyethylene microstructure.
  • This approach offers a novel pathway for designing polymers with specific properties.