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Related Experiment Videos

Polymerization of lanthanide acrylonitrile complexes.

El-Sayed H el-Mossalamy1, Ahmed A Khalil

  • 1Chemistry Department, Faculty of Science, Benha University, Benha, Egypt. el-mossalamy@hotmail.com

Annali Di Chimica
|August 21, 2002
PubMed
Summary

This study investigated lanthanide complexes with scandium, yttrium, lanthanum, gadolinium, cerium, and ytterbium. These metal ions influence acrylonitrile polymerization, altering polymer properties and stability.

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Area of Science:

  • Coordination Chemistry
  • Polymer Science
  • Materials Science

Background:

  • Lanthanide ions are crucial in catalysis and materials science.
  • Understanding their coordination complexes is key to developing new functional materials.
  • Acrylonitrile polymerization is a significant industrial process.

Purpose of the Study:

  • To synthesize and characterize molecular complexes of selected lanthanides (Sc3+, Y3+, La3+, Gd3+, Ce3+, Yb3+) in dimethylformamide (DMF).
  • To investigate the effect of these lanthanide ions on the polymerization of acrylonitrile.
  • To analyze the structural, magnetic, and thermal properties of the resulting polymer complexes.

Main Methods:

  • Spectrophotometry for characterizing lanthanide complexes in DMF.

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  • Infrared (IR) spectroscopy to analyze polymer structure.
  • Thermogravimetric analysis (TGA) for thermal stability assessment.
  • Magnetic moment measurements.

    • Main Results:

    • Equilibrium constants, molar extinction coefficients, transition energies, and free energies of lanthanide complexes were calculated.
    • Lanthanide ions influenced acrylonitrile polymerization, indicated by changes in IR spectra (loss of C≡N, gain of NH2 and OH bands).
    • Polymer complexes exhibited distinct magnetic properties and thermal stabilities compared to the homopolymer.

    Conclusions:

    • Lanthanide ions form stable complexes in DMF, with their properties quantifiable.
    • These lanthanide ions act as effective initiators or modifiers in acrylonitrile polymerization.
    • The resulting polymer complexes possess unique characteristics, suggesting potential applications in advanced materials.