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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the generated carbocation,...

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Thermal Scanning Conductometry (TSC) as a General Method for Studying and Controlling the Phase Behavior of Conductive Physical Gels
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Multifunctional gels from polymeric spin-crossover metallo-gelators.

Pauline Grondin1, Olivier Roubeau, Miguel Castro

  • 1CNRS, UPR 8641, Centre de Recherche Paul Pascal, Equipe Matériaux Moléculaires Magnétiques, 115 avenue du Dr. Albert Schweitzer, Pessac, F-33600, France.

Langmuir : the ACS Journal of Surfaces and Colloids
|January 27, 2010
PubMed
Summary
This summary is machine-generated.

Triazole-based coordination polymers form thermally responsive metallogels in organic solvents. Iron-based metallogels exhibit tunable spin-crossover and magnetic properties, alongside reversible gel-liquid transitions.

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Area of Science:

  • Coordination Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Coordination polymers offer tunable properties for advanced materials.
  • Metallogels combine metal-ion coordination with gelation for multifunctional applications.
  • Spin-crossover phenomenon in iron complexes enables responsive magnetic and optical behavior.

Purpose of the Study:

  • To investigate the gelation abilities of triazole-based coordination polymers in organic solvents.
  • To develop thermally responsive multifunctional metallogels, particularly for iron(II) polymers exhibiting spin-crossover.
  • To correlate gel properties with composition, solvent, and temperature.

Main Methods:

  • Synthesis of triazole-based coordination polymers [M(C(n)trz)(3)]A(2) (M = Fe(II), Zn(II); n = 13, 16, 18).
  • Gelation studies in organic solvents (decane, toluene) to form metallogels.
  • Phase diagram analysis (e.g., FeC(18)ptol/decane, FeC(18)ptol/toluene).
  • Rheological property measurements as a function of solvent, concentration, and temperature.
  • Microscopic, magnetic, and thermal characterization of the metallogels.

Main Results:

  • Formation of thermo-reversible physical gels in decane and toluene.
  • Iron-based metallogels displayed thermally reversible magnetic and optical crossovers due to spin-crossover.
  • Phase diagrams and rheological properties were determined and correlated with gel structure.
  • Both gel-liquid and spin-crossover transitions were tunable via gel mixture composition.

Conclusions:

  • Triazole-based coordination polymers can form multifunctional metallogels with tunable properties.
  • The spin-crossover phenomenon in iron metallogels is compatible with thermoreversible gelation.
  • Compositional control allows adjustment of magnetic, optical, and physical gel properties.