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Related Concept Videos

Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

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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.
Due to the absence of continuous...
4.1K
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

4.2K
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.
Removing one hydrogen from the intervening CH2 group...
4.2K
π Molecular Orbitals of 1,3-Butadiene01:24

π Molecular Orbitals of 1,3-Butadiene

12.5K
Conjugated dienes have lower heats of hydrogenation than cumulated and isolated dienes, making them more stable. The enhanced stabilization of conjugated systems can be understood from their π molecular orbitals.
The simplest conjugated diene is 1,3-butadiene: a four-carbon system where each carbon is sp2-hybridized and has an unhybridized p orbital that contains an unpaired electron. According to molecular orbital theory, atomic orbitals combine to form molecular orbitals such that the number...
12.5K
π Electron Effects on Chemical Shift: Overview01:27

π Electron Effects on Chemical Shift: Overview

1.9K
An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
1.9K
IR Absorption Frequency: Delocalization01:04

IR Absorption Frequency: Delocalization

1.6K
Electron delocalization refers to the distribution of electrons across multiple atoms within a molecule rather than being confined to a single atom or bond. This phenomenon is common in systems with conjugated bonds—structures where alternating single and double bonds allow π-electrons to move freely across the network. The movement of electrons stabilizes the molecule and can affect various chemical properties, including vibrational frequencies observed in IR spectroscopy.
In IR...
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VSEPR Theory and the Effect of Lone Pairs04:01

VSEPR Theory and the Effect of Lone Pairs

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Effect of Lone Pairs of Electrons on Molecule Geometry
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Related Experiment Video

Updated: Mar 14, 2026

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
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Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level

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Electron Delocalization in Perylene Diimide Helicenes.

Nathaniel J Schuster1, Daniel W Paley1, Steffen Jockusch1

  • 1Chemistry Department, Columbia University, New York, NY, 10027, USA.

Angewandte Chemie (International Ed. in English)
|October 8, 2016
PubMed
Summary

Two novel perylene diimide (PDI)-helicene molecules were synthesized. A shorter molecular bridge enhances intramolecular electronic delocalization in reduced PDI-helicenes, altering their properties.

Keywords:
chiralityhelicenesmixed-valence compoundsperylene diimideπ-π interactions

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Spatial Separation of Molecular Conformers and Clusters
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Spatial Separation of Molecular Conformers and Clusters
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Spatial Separation of Molecular Conformers and Clusters

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Area of Science:

  • Organic Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Helicenes are chiral aromatic compounds with unique photophysical properties.
  • Perylene diimides (PDIs) are potent electron acceptors with strong absorption and emission characteristics.
  • Fusion of different molecular scaffolds can lead to novel materials with tunable properties.

Purpose of the Study:

  • To synthesize and characterize novel helicene structures incorporating perylene diimide (PDI) units.
  • To investigate the impact of varying the linkage between PDI units on molecular structure and electronic properties.
  • To explore the phenomenon of intramolecular electronic delocalization in these PDI-helicene systems.

Main Methods:

  • Chemical synthesis of two PDI-helicene homologs with differing inter-PDI linkage lengths.
  • Spectroscopic analysis (UV-Vis absorption, fluorescence) to determine electronic properties.
  • Electrochemical methods (cyclic voltammetry) to assess redox behavior.
  • Computational modeling to understand structural and electronic interactions.

Main Results:

  • Successful synthesis of two PDI-helicene derivatives.
  • Structural analysis revealed distinct conformations due to varying inter-PDI distances.
  • The shorter inter-PDI linkage resulted in closer proximity of PDI π-electron clouds.
  • Reduced PDI-helicenes with shorter linkages exhibited enhanced intramolecular through-space electronic delocalization.

Conclusions:

  • The length of the linkage between PDI units significantly influences the structural and electronic properties of PDI-helicenes.
  • Proximity of PDI subunits facilitates through-space electronic communication upon reduction.
  • These findings offer insights into the design of novel organic electronic materials with tunable properties.