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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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Heterocyclic aromatic compounds are cyclic compounds that are aromatic and have one or more heteroatoms—atoms other than carbon, in the ring. Depending upon the number of atoms present in the ring, they can be either five or six-membered. Examples of five-membered heterocyclic aromatic compounds include pyrrole, furan, thiophene, and imidazole. Pyrrole consists of one nitrogen atom having one lone pair of electrons. Furan and thiophene have one oxygen and one sulfur heteroatom,...
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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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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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Like benzene, cyclobutadiene and cyclooctatetraene are cyclic compounds with alternate single and double bonds. However, their chemical behavior differs from benzene, as they are unstable and not aromatic. So, what are the structural characteristics of unsaturated compounds categorized as aromatic?  
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Sobre Difenalenos que Comprenden Siete Anillos Hexagonales

Oliwier Misztal1, Sławomir Ostrowski1, Jan Cz Dobrowolski1

  • 1Institute of Nuclear Chemistry and Technology, 16 Dorodna-Street, 03-195 Warsaw, Poland.

ACS omega
|December 22, 2025
PubMed
Resumen

Los difenalenos, hidrocarburos complejos, exhiben una estabilidad variable en estados singlete y triplete. Su aromaticidad y estructura influyen en las predicciones del estado fundamental, desafiando las suposiciones comunes sobre estabilidad y aromaticidad.

Palabras clave:
difenalenoshidrocarburos aromáticos policíclicosestado fundamentalteoría del funcional de la densidadestabilidadaromaticidadtransición singlete-triplete

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Área de la Ciencia:

  • Química Orgánica
  • Química Computacional
  • Ciencia de Materiales

Sus antecedentes:

  • Los difenalenos son hidrocarburos aromáticos policíclicos compuestos por dos unidades de fenaleno.
  • La comprensión de sus propiedades electrónicas y estabilidad es crucial para el diseño de nuevos materiales orgánicos.
  • Estudios previos han explorado la síntesis y las propiedades básicas de algunos derivados de difenaleno.

Objetivo del estudio:

  • Investigar las propiedades del estado fundamental (singlete vs. triplete) de varias estructuras de difenaleno.
  • Analizar la relación entre la estructura molecular, la aromaticidad y la estabilidad electrónica.
  • Desarrollar modelos predictivos para los estados fundamentales de los difenalenos basados en motivos estructurales.

Principales métodos:

  • Se emplearon cálculos de Teoría del Funcional de la Densidad (DFT) con el conjunto de bases cc-pVTZ.
  • Análisis de los lapso de energía singlete-triplete, diferencias de energía libre de Gibbs y frecuencias armónicas.
  • Evaluación de la aromaticidad utilizando los índices HOMA e INICS.

Principales resultados:

  • Cuatro de los ocho difenalenos estudiados favorecen el estado singlete, mientras que cuatro favorecen el estado triplete.
  • El lapso singlete-triplete generalmente excede las 10 kcal/mol, con dos excepciones cercanas a 5 kcal/mol.
  • La aromaticidad se reduce significativamente en moléculas estables en estado singlete, contrariamente a las suposiciones típicas de estabilidad.

Conclusiones:

  • La estabilidad del difenaleno está influenciada por características estructurales y puede predecirse analizando patrones de espín.
  • La relación inversa entre aromaticidad y estabilidad en estados singlete desafía la comprensión convencional.
  • El estudio proporciona información sobre el comportamiento electrónico de hidrocarburos aromáticos policíclicos complejos.