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XXIII.—An X-ray Examination of d-Mannitol and d-Mannose

Published online by Cambridge University Press:  15 September 2014

George W. McCrea
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Summary

The X-ray examination of d-mannitol and d-mannose gives the following results:—

d-Mannitol.—Unit cell, a = 8·66 A.U., b = 16·58 A.U., c = 5·501 A.U.; Space-group, Q4; Calculated density, 1·522 grms. per c.c.; Number of molecules per unit cell, 4.

The X-ray data show that the greatest length of the molecule corresponds to the a axis, and that the molecules have a long chain configuration.

d-Mannose.—Unit cell, a = 5·53 A.U., b = 17·66 A.U., c = 7·59 A.U.; Space-group, Q4; Calculated density, 1·602 grms. per c.c; Number of molecules per unit cell, 4.

The X-ray results show that a manno-pyranose ring structure is probable in the d-mannose molecule, and that the molecule has its greatest length along the c axis.

Type
Proceedings
Information
Proceedings of the Royal Society of Edinburgh , Volume 51 , 1932 , pp. 190 - 197
Copyright
Copyright © Royal Society of Edinburgh 1932

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