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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,...
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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Chair Conformation of Cyclohexane02:02

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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.
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Related Experiment Video

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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
16:24

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

Published on: August 2, 2012

Multiple weak supramolecular interactions stabilize a surprisingly twisted As2L3 assembly.

Melanie A Pitt1, Lev N Zakharov, Kumar Vanka

  • 1Department of Chemistry and Materials Science Institute, University of Oregon, Eugene, OR 97403-1253, USA.

Chemical Communications (Cambridge, England)
|August 30, 2008
PubMed
Summary
This summary is machine-generated.

This study reveals how a flexible arsenic (As) assembly changes shape with temperature, showing a unique, asymmetric structure in solution. These findings are key to understanding molecular behavior and design.

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Area of Science:

  • Inorganic Chemistry
  • Supramolecular Chemistry
  • Computational Chemistry

Background:

  • Flexible molecular assemblies present challenges in predicting and controlling their structural dynamics.
  • Understanding non-covalent interactions is crucial for designing stable supramolecular structures.

Purpose of the Study:

  • To investigate the conformational behavior of a flexible arsenic (As) assembly in solution.
  • To elucidate the structural features and stabilizing interactions of the As(2)(3) assembly.

Main Methods:

  • X-ray crystallography was used to determine the solid-state structure.
  • Density Functional Theory (DFT) calculations were employed to model electronic properties and interactions.
  • Nuclear Magnetic Resonance (NMR) spectroscopy was utilized to study the assembly's behavior in solution.

Main Results:

  • The study identified a temperature-dependent conformational flexibility in the As(2)(3) assembly.
  • A highly asymmetric structure was observed in solution, deviating from typical symmetric arrangements.
  • Key stabilizing interactions, including arsenic-pi (As-pi) and edge-to-face aromatic interactions, were identified.

Conclusions:

  • The As(2)(3) assembly exhibits dynamic conformational changes influenced by temperature.
  • The observed asymmetry is attributed to specific non-covalent interactions, highlighting their importance in molecular recognition and self-assembly.
  • This research provides insights into the behavior of flexible inorganic-organic hybrid systems.