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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.
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The adherens junctions that anchor cells together are multi-protein complexes that dynamically adapt to mechanical stimuli such as tensile forces and shear stress. Mechanosensory proteins in these junctions can sense such mechanical stimuli and undergo a shift in their conformation, resulting in an altered function — a process called mechanotransduction.
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Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
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If a reaction has a small equilibrium constant, the equilibrium position favors the reactants. In such reactions, a negligible change in concentration may occur if the initial concentrations of reactants are high and the Kc value is small. In such circumstances, the equilibrium concentration is approximately equal to its initial concentration.  This estimation can be used to simplify the equilibrium calculations by assuming that some equilibrium concentrations are equal to the initial...
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Catenins01:23

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Catenins are characterized by multiple binding domains and dynamic structures that allow them to function as linker proteins in cell junction complexes. All catenins, except α-catenin, contain a characteristic protein sequence called the armadillo repeat and are therefore also called armadillo proteins.
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The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
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How small can a catenane be, if we consider quantum tunnelling?

Sindy Julieth Rodríguez-Sotelo1, Juan Julian Santoyo-Flores1, Sebastian Kozuch1

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The kinetic stability of small alkane catenanes and pseudo-rotaxanes was investigated. A ten-membered ring

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Area of Science:

  • Supramolecular Chemistry
  • Physical Chemistry

Background:

  • Catenanes and pseudo-rotaxanes are mechanically interlocked molecules with unique properties.
  • Understanding their kinetic stability is crucial for potential applications.

Purpose of the Study:

  • To investigate the kinetic stability of the smallest alkane-based catenanes and pseudo-rotaxanes.
  • To focus on heavy atom quantum tunneling as a primary instability mechanism.

Main Methods:

  • Computational modeling of molecular dynamics.
  • Analysis of quantum tunneling pathways.

Main Results:

  • The "corset effect" of a ten-membered ring was identified as a key destabilizing factor.
  • Even under deep cryogenic conditions, quantum tunneling can induce instability.

Conclusions:

  • The smallest alkane-based catenanes and pseudo-rotaxanes exhibit significant kinetic instability.
  • Quantum tunneling, particularly influenced by ring size and conformation, dictates stability limits.