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Related Concept Videos

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

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Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
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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...
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Olefin Metathesis Polymerization: Overview01:13

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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
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Formation of a Dicopper Platform Based Polyrotaxane Whose "String" and "Bead" Are Constructed from the Same

Huiyeong Ju1, Jack K Clegg2, Ki-Min Park1

  • 1†Department of Chemistry and Research Institute of Natural Science, Gyeongsang National University, Jinju 660-701, S. Korea.

Journal of the American Chemical Society
|July 18, 2015
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Summary

Researchers created a novel one-dimensional polyrotaxane using dicopper components and a pyridylpiperazine linker. This supramolecular structure features self-threading "beads" onto a "string" made from identical building blocks.

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Area of Science:

  • Coordination Chemistry
  • Supramolecular Chemistry
  • Materials Science

Background:

  • Polyrotaxanes are mechanically interlocked molecular architectures with potential applications in nanotechnology.
  • The synthesis of complex polyrotaxane structures often requires intricate multi-step procedures.

Purpose of the Study:

  • To report the first synthesis of a one-dimensional polyrotaxane using identical components for both the string and bead.
  • To investigate the self-assembly mechanism driven by specific molecular interactions.

Main Methods:

  • Utilized a dicopper platform [Cu2(L)2(THF)2] and 1,4-bis(4-pyridyl)piperazine (bpp) as building blocks.
  • Characterized the resulting polyrotaxane structure using appropriate analytical techniques.

Main Results:

  • Successfully synthesized a one-dimensional polyrotaxane {[(1)(μ2-bpp)][(1)2(bpp)2]}n.
  • The polyrotaxane features a stair-like string threaded by rectangular "beads" with dimensions 7.40 × 15.64 Å.
  • Identified π-π stacking as the primary driving force for the self-assembly process.

Conclusions:

  • Demonstrated a facile method for constructing complex polyrotaxanes from a single set of components.
  • The precise electronic and steric complementarity between the string and bead components is crucial for successful polyrotaxane formation.
  • Proposed a plausible pathway for the self-assembly of this unique supramolecular structure.