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π Molecular Orbitals of 1,3-Butadiene01:24

π Molecular Orbitals of 1,3-Butadiene

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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...
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Hybridization of Atomic Orbitals II03:35

Hybridization of Atomic Orbitals II

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sp3d and sp3d 2 Hybridization
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Structure of Benzene: Molecular Orbital Model01:18

Structure of Benzene: Molecular Orbital Model

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According to the molecular orbital (MO) model, benzene has a planar structure with a regular hexagon of six sp2 hybridized carbons. As shown in Figure 1, each carbon is bonded to three other atoms with C–C–C and H–C–C bond angles of 120°. The C–H bond length is 109 pm, and the C–C bond length is 139 pm which is midway between the single bond length of sp3 hybridized carbons (154 pm) and sp2 hybridized carbons (133 pm).
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¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

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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.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
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Hybridization of Atomic Orbitals I03:24

Hybridization of Atomic Orbitals I

46.4K
The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
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Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

2.7K
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...
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Updated: Jun 1, 2025

Monitoring the Effects of Illumination on the Structure of Conjugated Polymer Gels Using Neutron Scattering
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Monitoring the Effects of Illumination on the Structure of Conjugated Polymer Gels Using Neutron Scattering

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Stack bonding in pentacene and its derivatives.

Craig A Bayse1

  • 1Department of Chemistry and Biochemistry, Old Dominion University, Norfolk, Virginia 23529, USA. cbayse@odu.edu.

Physical Chemistry Chemical Physics : PCCP
|January 17, 2025
PubMed
Summary

The stack bond order (SBO) model explains π-stacking interactions in organic materials. It shows that specific molecular orbital combinations dictate stable dimer orientations, influencing charge mobility in semiconductors.

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Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene
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Area of Science:

  • Materials Science
  • Computational Chemistry
  • Organic Electronics

Background:

  • π-stacking interactions are crucial for molecular recognition, self-assembly, and organic semiconductor performance.
  • The stack bond order (SBO) model provides a framework for understanding these interactions based on molecular orbital (MO) combinations.

Purpose of the Study:

  • To investigate the role of the SBO model in determining π-stacking conformations of pentacene and perfluoropentacene dimers.
  • To correlate π-stacking orientations with molecular orbital structures and their impact on charge mobility.

Main Methods:

  • Density Functional Theory (DFT) calculations to explore potential energy surfaces of π-stacked dimers.
  • Analysis of molecular orbital (MO) compositions and their bonding characteristics.
  • Examination of X-ray crystallographic data for TIPS-pentacene to validate theoretical predictions.

Main Results:

  • DFT calculations identified parallel displaced (PD) minima on the potential energy surface for pentacene and perfluoropentacene dimers, consistent with the SBO model.
  • Experimental structures of TIPS-pentacene derivatives showed packing arrangements aligning with predicted SBO minima.
  • π-stacking variability in crystalline materials arises from a balance between SBO-driven preferences and steric hindrance.

Conclusions:

  • The SBO model successfully predicts stable π-stacking orientations in pentacene-based systems.
  • The offset orientation in TIPS-pentacene is attributed to enhanced MO overlap and reduced electron repulsion.
  • Dimer MO structure is directly related to charge mobility, favoring PD conformations for higher conductivity.