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Related Concept Videos

Chair Conformation of Cyclohexane02:02

Chair Conformation of Cyclohexane

14.4K
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...
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Conformations of Cyclohexane02:11

Conformations of Cyclohexane

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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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Conformations of Cycloalkanes02:29

Conformations of Cycloalkanes

11.6K
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...
11.6K
Plastic Deformation in Circular Shafts01:20

Plastic Deformation in Circular Shafts

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When materials are subjected to forces that surpass their yield strength, they undergo a process known as plastic deformation. This results in a permanent alteration or strain in their structure. This concept can be specifically applied to circular shafts, where the deformation leads to a change in its shape. The precise evaluation of this plastic deformation requires understanding the stress distribution within the circular shaft, which is achieved by calculating the maximum shearing stress in...
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Plastic Deformations01:19

Plastic Deformations

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Plastic deformation represents a fundamental concept in materials science, which explains the irreversible change in the shape of a material when it experiences stress beyond its elastic capability. This phenomenon is important in structural engineering, especially in designing and analyzing cantilever beams—structures that are securely fixed at one end and bear loads at the opposite end. When these beams are subjected to loads within their elastic range, they will return to their...
123
Deformation of Member under Multiple Loadings01:11

Deformation of Member under Multiple Loadings

160
When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...
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Flexural Rigidity Measurements of Biopolymers Using Gliding Assays
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Flexural Rigidity Measurements of Biopolymers Using Gliding Assays

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From π-Conjugated Rods to Shape-Persistent Rings, Wheels, and Ladders: The Question of Rigidity.

Sigurd Höger1, John M Lupton2

  • 1Kekulé-Institut für Organische Chemie und Biochemie, Rheinische Friedrich-Wilhelms-Universität Bonn, Gerhard-Domagk-Str. 1, 53121 Bonn, Germany.

Accounts of Chemical Research
|August 16, 2024
PubMed
Summary
This summary is machine-generated.

Rigid-rod molecules gain rigidity when covalently linked, enhancing their optical and electronic properties for applications in optoelectronics. These stiffened structures, including molecular spoked wheels and ladder-like polymers, offer new possibilities for single-photon sources.

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Polymer Chemistry

Background:

  • Rigid-rod oligomers and polymers, often based on (hetero)aromatic rings, exhibit unexpected flexibility despite their rigid components.
  • This flexibility influences their optical and electronic properties and affects macrocycle stability.

Purpose of the Study:

  • To investigate the impact of covalently connecting rigid molecular entities on their overall rigidity and properties.
  • To explore the development of novel molecular architectures like molecular spoked wheels and ladder-like polymers.
  • To assess the potential of these structures in optoelectronic devices and as single-photon sources.

Main Methods:

  • Scanning tunneling microscopy (STM) to observe flexibility at the solid-liquid interface.
  • Molecular dynamics (MD) simulations to visualize rigidity enhancement.
  • Single-molecule fluorescence spectroscopy (SMFS) to compare single- and double-stranded molecules.

Main Results:

  • Covalently linking rigid molecular units leads to a self-reinforcing increase in rigidity for all molecular parts.
  • Molecular spoked wheels, with rigid struts in rings, demonstrate reduced flexibility and enhanced thermal stability.
  • Ladder-like structures formed from rigid-rod polymers show remarkable rigidity enhancement.

Conclusions:

  • The covalent connection of rigid molecular entities significantly enhances overall molecular rigidity.
  • These stiffened structures, including platform molecules and polymers, have potential applications in optoelectronics and as deterministic single-photon sources.
  • Advanced techniques like STM and SMFS are crucial for analyzing these complex, high-molecular-weight structures.