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Crystallographic data for some organic compounds

Published online by Cambridge University Press:  14 March 2018

Gilbert Greenwood
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Extract

The isomorphous relationships for organic compounds are not so simple as they sometimes are for inorganic. Very often a series of chemically similar orgallic substances does not show any apparent trace of crystallographic similarity. It appears that the introduction of further groups into the molecule may cause the crystal-system to change in a manner which cannot be predicted. Thus, glyoxalinc-4(or 5)- sulphonic acid is tetragonal, whilst 4(or 5)-bromoglyoxaline-5(or 4)- sulphonic acid is monoclinic; the introduction of a methyl group into the 2 position gives rise to an orthorhombic crystal, whilst the introduction of the same group into the 1 position leaves the crystal-system unchanged. In some cases it has been found that evell though the crystal-system is changed, there still remains a very close similarity between corresponding angles in the different substances.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 20 , Issue 110 , September 1925 , pp. 393 - 405
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1925

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References

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