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Structures of Carboxylic Acid Derivatives01:28

Structures of Carboxylic Acid Derivatives

Structure of Carboxylic Acid Derivatives
Carboxylic acid derivatives contain an acyl group attached to a heteroatom such as chlorine, oxygen, or nitrogen. The carbonyl carbon and oxygen are both sp2-hybridized with an unhybridized p orbital.
The three sp2 orbitals of the carbonyl carbon form three σ bonds, one each with the carbonyl oxygen, the α carbon, and the heteroatom, whereas the other two sp2 orbitals of the carbonyl oxygen are occupied by the lone pairs. Further, the unhybridized p...
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Conjugated dienes are compounds characterized by the presence of alternating double and single bonds. In a conjugated system like 1,3-butadiene, the unhybridized 2p orbital on each carbon overlaps continuously, allowing the π electrons to be delocalized across the entire molecule. In contrast, this type of overlap does not occur in cumulated and isolated dienes, such as 2,3-pentadiene and 1,4-pentadiene, respectively. Instead, the π electrons remain localized between the double...
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Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
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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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Understanding structure-mobility relations for perylene tetracarboxydiimide derivatives.

Valentina Marcon1, Dag W Breiby, Wojciech Pisula

  • 1Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany. marcon@mpip-mainz.mpg.de

Journal of the American Chemical Society
|July 28, 2009
PubMed
Summary

This study reveals helical molecular arrangements in discotic mesophases can unexpectedly enhance hole transport in organic semiconductors. Understanding molecular packing is key to designing efficient charge-transporting materials.

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Published on: March 20, 2017

Area of Science:

  • Materials Science
  • Organic Electronics
  • Supramolecular Chemistry

Background:

  • Discotic mesophases self-assemble into columnar structures, acting as molecular wires for charge transport.
  • Molecular packing critically influences charge carrier mobility in these systems.
  • Perylene tetracarboxdiimide derivatives are key organic semiconductors.

Purpose of the Study:

  • To elucidate the packing motifs of a perylene tetracarboxdiimide derivative.
  • To correlate molecular arrangement with charge carrier mobility.
  • To provide insights for rational design of high-mobility organic semiconductors.

Main Methods:

  • Combined wide-angle X-ray scattering (WAXS) experiments and molecular dynamics (MD) simulations to determine molecular packing.
  • Utilized pulse-radiolysis time-resolved microwave conductivity (TRMC) and non-adiabatic Marcus charge transfer theory simulations to assess charge mobility.
  • Performed statistical analysis to evaluate the impact of structural defects.

Main Results:

  • Identified specific packing motifs of the perylene tetracarboxdiimide derivative.
  • Demonstrated that a helical arrangement with a 45-degree twist angle favors hole transport, contrary to the material's typical n-type behavior.
  • Quantified the significant suppression of charge transport by structural defects.

Conclusions:

  • The helical molecular packing in discotic mesophases can facilitate hole transport in organic semiconductors.
  • Structural integrity is crucial for efficient charge mobility.
  • This work offers a pathway for designing improved perylenediimide-based materials for organic electronics.