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Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

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Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
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Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
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Chair Conformation of Cyclohexane02:02

Chair Conformation of Cyclohexane

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The chair conformation is the most stable form of cyclohexane due to the absence of angle and torsional strain. The absence of angle strain is a result of cyclohexane’s bond angle being very close to the ideal tetrahedral bond angle of 109.5° in its chair conformer. Similarly, the torsional strain is also absent owing to the perfectly staggered arrangement of bonds.
The hydrogen atoms linked to carbons are arranged in two different axial and equatorial orientations to achieve this...
14.4K
Conformations of Cyclohexane02:11

Conformations of Cyclohexane

12.2K
Cyclohexane does not exist in a planar form due to the high angle and torsional strain it would experience in the planar structure. Instead, it adopts non-planar chair and boat conformations.
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal...
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Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

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Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
2.8K
Coordination Number and Geometry02:57

Coordination Number and Geometry

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For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Crystal structure and characterization of a new chain-like polyrotaxane zinc(II) coordination polymer with mixed

Chanikarn Kummuang1, Kittipong Chainok2, Nanthawat Wannarit1,2

  • 1Department of Chemistry Faculty of Science and Technology Thammasat University, Pathum Thani 12121 Thailand.

Acta Crystallographica. Section E, Crystallographic Communications
|June 9, 2025
PubMed
Summary

A novel chain-like polyrotaxane coordination polymer featuring zinc(II) ions was synthesized. This unique structure involves interweaving dinuclear macrocycles and zigzag chains, stabilized by hydrogen bonding and π-π interactions.

Keywords:
1,4-bis­(imidazol-1-ylmeth­yl)benzeneZnIIchain structurecrystal structurepolyrotaxanepyridine-2,6-di­carboxyl­ate

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Controlled Photoredox Ring-Opening Polymerization of O-Carboxyanhydrides Mediated by Ni/Zn Complexes
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Area of Science:

  • Coordination Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Coordination polymers are advanced materials with diverse applications.
  • Polyrotaxane structures offer unique topological and mechanical properties.
  • Zinc(II) coordination polymers are of interest due to their versatile coordination geometries.

Purpose of the Study:

  • To synthesize and characterize a novel chain-like polyrotaxane coordination polymer.
  • To elucidate the molecular structure and supramolecular assembly of the new material.
  • To investigate the role of ligands and metal ions in forming complex architectures.

Main Methods:

  • Synthesis of the coordination polymer using pyridine-2,6-dicarboxylate (2,6-PDC) and 1,4-bis(1H-imidazol-1-ylmethyl)benzene (bix) ligands with Zn(II) ions.
  • Single-crystal X-ray diffraction for detailed structural analysis.
  • Characterization of intermolecular interactions, including hydrogen bonding and π-π stacking.

Main Results:

  • A novel chain-like polyrotaxane structure, {[Zn2(2,6-PDC)2(bix)2]·9H2O}n, was successfully synthesized.
  • The structure features two distinct Zn(II) units with fivefold coordination, intermediate between trigonal-bipyramidal and square-pyramidal geometries.
  • Interweaving of dinuclear macrocycles and zigzag chains forms the polyrotaxane architecture, stabilized by extensive hydrogen bonding and π-π interactions.

Conclusions:

  • The study reports the first synthesis of a chain-like polyrotaxane coordination polymer based on Zn(II).
  • The intricate interweaving of different structural motifs highlights the versatility of the chosen ligands in constructing complex supramolecular architectures.
  • The findings contribute to the understanding of polyrotaxane formation in coordination polymers and their potential for advanced material design.