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Related Concept Videos

Conformations of Cyclohexane02:11

Conformations of Cyclohexane

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 tetrahedral value,...
¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

¹H NMR of Conformationally Flexible Molecules: Temporal Resolution

At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
Chair Conformation of Cyclohexane02:02

Chair Conformation of Cyclohexane

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 staggered...
Conformations of Cycloalkanes02:29

Conformations of Cycloalkanes

Adolf von Baeyer attempted to explain the instabilities of small and large cycloalkane rings using the concept of angle strain — the strain caused by the deviation of bond angles from the ideal 109.5° tetrahedral value for sp3  hybridized carbons. However, while cyclopropane and cyclobutane are strained, as expected from their highly compressed bond angles, cyclopentane is more strained than predicted, and cyclohexane is virtually strain-free. Hence, Baeyer’s theory that was based on the...
Conformations of Ethane and Propane02:18

Conformations of Ethane and Propane

In an organic molecule, free rotation about the carbon-carbon single bond results in energetically different conformers of the molecule. Due to this rotation, called the internal rotation, ethane has two major conformations — staggered and eclipsed.
Staggered conformation is a low energy and more stable conformation with the C-H bonds on the front carbon placed at 60°dihedral angles relative to the C-H bonds on the back carbon, leading to a reduced torsional strain. In staggered ethane, the...
Radical Chain-Growth Polymerization: Chain Branching01:17

Radical Chain-Growth Polymerization: Chain Branching

The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...

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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Main-chain linear polyrotaxanes: synthesis, characterization, and conformational modulation.

Ji-Min Han1, Yong-Hong Zhang, Xiao-Ye Wang

  • 1Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|December 4, 2012
PubMed
Summary

Two novel polyrotaxanes (P1 and P2) were synthesized. Their distinct conformational topologies, rigid rod-like (P1) versus flexible (P2), were revealed through energy transfer studies and confirmed by light scattering and AFM, influencing self-assembly.

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Area of Science:

  • Polymer Chemistry
  • Supramolecular Chemistry
  • Materials Science

Background:

  • Polyrotaxanes are supramolecular structures with unique properties.
  • Controlling their conformational topology is key to designing advanced materials.
  • Host-guest interactions offer a powerful strategy for polyrotaxane synthesis.

Purpose of the Study:

  • To synthesize two distinct linear polyrotaxanes (P1 and P2) using host-guest chemistry and click reactions.
  • To investigate the conformational differences between P1 and P2 in solution.
  • To explore the influence of electrostatic interactions on polyrotaxane conformation and self-assembly.

Main Methods:

  • Synthesis of linear polyrotaxanes (P1, P2) via crown-ether/ammonium interactions and click chemistry.
  • Steady-state and time-resolved spectroscopy for energy transfer analysis.
  • Dynamic/static light scattering and atomic force microscopy for structural characterization.

Main Results:

  • Polymer P1 exhibited a rigid, rod-like structure, while P2 showed a flexible, curved conformation.
  • The flexible topology of P2 facilitated self-assembly into large, ball-shaped particles.
  • Anion addition enhanced energy transfer via electrostatic interactions; base addition disrupted host-guest interactions.

Conclusions:

  • Conformational topology significantly impacts polyrotaxane self-assembly.
  • Intra- and intermolecular electrostatic interactions are critical for modulating polymer conformation.
  • Anion and base stimuli can reversibly control polyrotaxane structure and energy transfer.