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Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...
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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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Polymers that are made up of identical monomer units are called homopolymers. Only one repeating unit is involved in the construction of the homopolymer structure. For example, as depicted in Figure 1, polypropylene is a homopolymer constituted of propylene monomers. Here, the only repeating unit in the polymer chain is propylene.
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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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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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[2.2]Paracyclophane Derivatives as Building Blocks for Coordination Polymers.

Mihail Lucian Birsa1, Henning Hopf1,2, Peter G Jones1,3

  • 1Department of Chemistry, Alexandru Ioan Cuza University of Iasi, No. 11 Carol I Blvd., 700506 Iasi, Romania.

Materials (Basel, Switzerland)
|June 10, 2023
PubMed
Summary
This summary is machine-generated.

Researchers synthesized novel paracyclophane derivatives using Suzuki coupling. One derivative formed a 2D coordination polymer with zinc, featuring paddlewheel clusters and a five-coordinated zinc center.

Keywords:
Suzuki coupling[2.2]paracyclophanecoordination polymer

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Organic Synthesis

Background:

  • [2.2]Paracyclophanes are versatile molecular scaffolds.
  • Carboxylic acid functionalization is key for coordination chemistry.
  • Suzuki coupling is a powerful tool for C-C bond formation.

Purpose of the Study:

  • To synthesize novel di- and tetracarboxylic [2.2]paracyclophane derivatives.
  • To explore the coordination chemistry of these derivatives.
  • To construct novel coordination polymers.

Main Methods:

  • Suzuki coupling reactions between brominated [2.2]paracyclophanes and 4-(methoxycarbonyl)phenylboronic acid.
  • Reaction of a synthesized paracyclophane derivative with zinc nitrate.
  • X-ray crystallography for structural determination.

Main Results:

  • Successful synthesis of new di- and tetracarboxylic [2.2]paracyclophane derivatives.
  • Formation of a 2D coordination polymer from pp-bis(4-carboxyphenyl)[2.2]paracylophane and zinc nitrate.
  • Characterization of the coordination polymer, revealing zinc-carboxylate paddlewheel clusters and a five-coordinated zinc center with square-pyramidal geometry.

Conclusions:

  • Novel paracyclophane derivatives can be synthesized efficiently.
  • These derivatives are suitable building blocks for coordination polymers.
  • The resulting coordination polymer exhibits unique structural features.