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Different notations are used to represent the three-dimensional structure of molecules on two-dimensional surfaces. One of the most commonly used representations is the dash-wedge formula. The dashed wedges, solid wedges, and the plane lines indicate the groups situated behind the plane, coming out of the plane, and in the plane, respectively.
The organic molecules rotate across the single bonds leading to numerous temporary three-dimensional structures of varying energy known as conformers.
The Phragmoplast01:59

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Updated: Jul 13, 2026

Culturing and Applications of Rotating Wall Vessel Bioreactor Derived 3D Epithelial Cell Models
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Organizaciones mesomórficas columnares en las ciclotrifosfazenas.

Joaquín Barberá1, Manuel Bardají, Josefina Jiménez

  • 1Polymer and Liquid Crystal Group--Departamento de Química Orgánica, Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza-C.S.I.C., 50009 Zaragoza, Spain.

Journal of the American Chemical Society
|June 23, 2005
PubMed
Resumen

Los nuevos organociclotrifosfazenos con unidades de éster aromático exhiben un mesomorfismo sintonizable. Dependiendo de la estructura de las cadenas terminales, forman fases de cristal líquido cilíndricas (calamíticas) o en forma de disco (columnar) con alta estabilidad térmica.

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Área de la Ciencia:

  • Ciencia de los materiales Ciencia de los materiales.
  • Química supramolecular de las moléculas.
  • Química orgánica es la química orgánica.

Sus antecedentes:

  • Los organociclotrifosfazenos son plataformas moleculares versátiles.
  • Los cristales líquidos exhiben fases ordenadas entre los estados sólido e isotrópico.
  • El mesomorfismo está influenciado por la arquitectura molecular y las interacciones intermoleculares.

Objetivo del estudio:

  • Desarrollar una estrategia sintética para los nuevos organociclotrifosfazenos.
  • Investigar la relación entre la estructura molecular y el comportamiento mesomórfico.
  • Para explorar el potencial de las propiedades cristalinas líquidas sintonizables.

Principales métodos:

  • Síntesis de ciclotrifosfazenos que contienen unidades de éster aromático policatenario.
  • Caracterización de compuestos sintetizados utilizando técnicas como la difracción de rayos X.
  • Análisis térmico para determinar el comportamiento y la estabilidad de la mesofase.

Principales resultados:

  • Síntesis exitosa de organociclotrifosfazenos con unidades promesogénicas específicas.
  • Demostración del mesomorfismo calamítico con cadenas de alquilo de un solo extremo, formando superestructuras cilíndricas.
  • Observación de mesofasas columnares con tres largas cadenas terminales, formando estructuras discoticas.
  • La difracción de rayos X confirmó el ordenamiento helicoidal en fases columnares.
  • Todos los compuestos sintetizados exhibieron una alta estabilidad térmica.

Conclusiones:

  • La microsegregación de segmentos rígidos y flexibles dicta el mesomorfismo.
  • El diseño molecular permite el control sobre el tipo de fase cristalina líquida formada.
  • Estos organociclotrifosfazenos representan una clase prometedora de materiales para aplicaciones avanzadas.