Graduate Thesis Or Dissertation
 

The crystallography of Aldrin and Dieldrin insecticides

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  • The object of this investigation was to determine a number of physical constants for the crystals of two commonly used insecticide compounds. The compounds chosen were Aldrin and Dieldrin, which are chlorinated cyclodiene compounds. These compounds are in considerable use today, and show promise of heavy continued use. The data collected includes crystal system and structure, unit cell dimensions, refractive indices, optical directions, and fusion data. This data should allow determination of the identity of these compounds by use of the techniques of chemical microscopy, although admittedly, the work reported here does not include the complete amount of crystallographic and optical information possible. The two compounds were investigated and the following information was obtained. Dieldrin crystallizes into two forms, depending presumably upon the polarity of the solvent used. One form (benzene) is tetragonal, and was found to be uniaxial negative in character. The other was orthorhombic and biaxial positive. Aldrin crystallizes in the monoclinic system and is also biaxial positive. Both Aldrin and Dieldrin have rather large unit cells. The author had considerable difficulty in obtaining the proper sized crystals for analysis. Nevertheless, it was demonstrated that the commercial and rather crude product could be recrystallized a few times using ordinary techniques, and the crystals obtained could be used to provide a fairly specific identification.
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Déclaration de droits
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