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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...
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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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Structure of Lipids03:38

Structure of Lipids

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Lipids include a diverse group of compounds that are largely nonpolar in nature. This is because they are hydrocarbons that include mostly nonpolar carbon-carbon or carbon-hydrogen bonds. Non-polar molecules are hydrophobic (“water fearing”), or insoluble in water. Lipids perform many different functions in a cell. Cells store energy for long-term use in the form of fats. Lipids also provide insulation from the environment for plants and animals. For example, they help keep aquatic...
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Structures of Solids02:22

Structures of Solids

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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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Structural Isomerism02:34

Structural Isomerism

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Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
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Viral Structure00:56

Viral Structure

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Viruses are extraordinarily diverse in shape and size, but they all have several structural features in common. All viruses have a core that contains a DNA- or RNA-based genome. The core is surrounded by a protective coat of proteins called the capsid. The capsid is composed of subunits called capsomeres. The capsid and genome-containing core are together known as the nucleocapsid.
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Updated: Jan 22, 2026

Biomass Conversion to Produce Hydrocarbon Liquid Fuel Via Hot-vapor Filtered Fast Pyrolysis and Catalytic Hydrotreating
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Stacking structure in liquid polyaromatic hydrocarbons.

Thomas F Headen1, Neal T Skipper2, Michael P Hoepfner3

  • 1ISIS Neutron and Muon Source, Harwell Campus, Didcot, Oxon, OX11 0QX, UK. tom.headen@stfc.ac.uk.

Chemical Communications (Cambridge, England)
|January 21, 2026
PubMed
Summary
This summary is machine-generated.

We studied polyaromatic hydrocarbons like phenanthrene and pyrene using neutron scattering. Pyrene shows the most parallel stacking, with 46% of molecules forming pairs, indicating significant molecular ordering.

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Area of Science:

  • Materials Science
  • Chemical Physics
  • Condensed Matter Physics

Background:

  • Polyaromatic hydrocarbons (PAHs) are crucial in various scientific and industrial applications.
  • Understanding the liquid-phase structure of PAHs is essential for accurate modeling and application development.

Purpose of the Study:

  • To investigate the liquid structure of phenanthrene and pyrene using neutron total scattering.
  • To compare the stacking behavior of these PAHs with smaller molecules like benzene and naphthalene.
  • To determine the degree and relative orientation of π-stacked pairs in liquid PAHs.

Main Methods:

  • Neutron total scattering experiments were conducted on phenanthrene and pyrene.
  • Simulation-based data refinement was employed for structural analysis.
  • The degree and relative position of π-stacked pairs were quantified.

Main Results:

  • Pyrene exhibited the highest degree of parallel stacking, with 46% of molecules forming stacked pairs.
  • A trend of decreasing displacement in stacking was observed with increasing aromatic core size.
  • For pyrene, no offset in π-stacking was detected, indicating perfect parallel alignment.

Conclusions:

  • The study provides fundamental insights into the liquid-phase structure of PAHs.
  • Findings are crucial for modeling PAH behavior in fields like optoelectronics, astrochemistry, and crude oil science.
  • The observed stacking trends offer a basis for predicting and controlling PAH molecular arrangements.