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Cristales de aspirina retorcidos y retorcidos.

Xiaoyan Cui¹, Andrew L Rohl, Alexander Shtukenberg

¹Department of Chemistry, New York University, 100 Washington Square East, Silver Center, Room 1001, New York, New York 10003, United States.

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|February 22, 2013

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La cristalización de la aspirina con ácido salicílico crea esferulitos de bandas únicas. Estas estructuras exhiben cristalitos helicoidales con birefringencia tanto lineal como circular, impulsados por la tensión molecular.

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Área de la Ciencia:

Ciencia de los materiales Ciencia de los materiales.
La cristalografía es una técnica de cristalografía.
La ciencia de los polímeros es la ciencia de los polímeros.

Sus antecedentes:

Las esferulitas son estructuras cristalinas comunes en polímeros y materiales orgánicos.
Comprender la formación y las propiedades de los sistemas aspirina-ácido salicílico es crucial para las aplicaciones farmacéuticas.

Objetivo del estudio:

Para investigar la cristalización de la aspirina en presencia de ácido salicílico.
Caracterizar las propiedades estructurales y ópticas de las esferulitas con bandas resultantes.

Principales métodos:

Cristalización por fusión de aspirina con diferentes concentraciones de ácido salicílico.
Análisis mediante microscopía electrónica de barrido (SEM), difracción de rayos X (XRD) y polarimetría óptica.
Imágenes de la matriz de Mueller para una evaluación detallada de las propiedades ópticas.

Principales resultados:

Se observaron esferulitas en bandas compuestas de cristalitos helicoidales a lo largo de la dirección de crecimiento <010>.
Se detectaron oscilaciones radiales tanto en la birefringencia lineal como en la circular.
Se identificó como la causa de los fenómenos ópticos una ligera y sistemática dispersión de las lámelas.

Conclusiones:

La torsión de las cristalinas se atribuye a la tensión molecular de la incorporación de ácido salicílico.
Las propiedades ópticas observadas están directamente relacionadas con la morfología y composición de la cristallita.
Este estudio proporciona información sobre las relaciones estructura-propiedad en materiales orgánicos cristalinos.