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Optical crystallographic properties of organic compounds

V. Chlorothymol, Neocinchophen, Coumarin, and Salicylanilide

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Summary

The optical crystallographic properties of coumarin (I), salicylanilide, chlorothymol, and neocinchophen, all used in medicine or related fields, have been determined. These constants are useful in the identification of these compounds. It has been shown that both, chlorothymol and thymol, can be identified in mixtures of these two substances. Salicylanilide shows very strong negative birefringence, whereas coumarin and chlorothymol both show strong and moderately strong positive birefringence, respectively.

Zusammenfassung

Die kristalloptischen Eigenschaften von Cumarin (I), Salioylanilid, Chlorthymol und Neocinchophen, vier Verbindungen, die medizinisch von Interesse sind, wurden bestimmt. Die optischen Konstanten sind für die Erkennung dieser Substanzen nützlich und es wird darauf hingewiesen, daß Chlorthymol und Thymol in Mischungen dieser beiden Verbindungen erkannt werden können. Salicylanilid zeigt sehr starke negative Doppelbrechung, während Cumarin (I) und Chlorthymol stark bzw. mittelmäßig stark positiv doppelbrechend sind.

Résumé

On a déterminé les propriétés cristallographiques optiques de la coumarine (I), de la salicylanilide, du chlorothymol et du néocinchophène, produits employés en médecine. Ces constantes sont utiles pour l'identification de 764 R. N. Castle: Optical Crystallographic Properties of Organic Compounds. ces composés. On a montré que le thymol et le chlorothymol peuvent être identifiés dans les mélanges contenant ces deux substances. La salicylanilide possède une biréfringence négative très forte, tandis que la coumarine et le chlorothymol possèdent respectivement, une biréfringence positive forte et moyenne.

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Literature

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Castle, R.N. Optical crystallographic properties of organic compounds. Mikrochim Acta 43, 761–764 (1955). https://doi.org/10.1007/BF01246456

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  • DOI: https://doi.org/10.1007/BF01246456

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