Acta Crystallographica Section C

Crystal Structure Communications

Volume 59, Part 10 (October 2003)

Acta Cryst. (2003). C59, o567-o570 [doi:10.1107/S0108270103018961]

Three polymorphs (, , and ) of D-mannitol at 100 K

F. R. Fronczek, H. N. Kamel and M. Slattery

Abstract: In the monoclinic [bold delta] polymorph of D-mannitol, C₆H₁₄O₆, both the molecule and the packing have approximate twofold rotational symmetry. The P2₁ structure thus approximates space group C222₁, and the [alpha] ' polymorph, previously reported in that space group, is almost certainly identical to the [bold delta] polymorph. However, torsion angles along the main backbone of the molecule deviate from twofold symmetry by as much as 7.4 (3)° and the hydrogen-bonding pattern does not conform to the higher symmetry. The [alpha] polymorph reported here is identical to the previously reported [bold kappa] polymorph, and the low-temperature structure of the [beta] polymorph agrees well with previously reported room-temperature determinations. The range of C-O bond lengths over the three polymorphs is 1.428 (2)-1.437 (4) Å, and the range of C-C distances is 1.515 (4)-1.5406 (19) Å. The [bold delta] polymorph has the highest density of the three, both at room temperature and at 100 K.

Formula: Three polymorphs of C₆H₁₄O₆

Online 23 September 2003


	Structure factor file (CIF format) (63.6 kbytes) Contains datablock Alpha

	Structure factor file (CIF format) (90.5 kbytes) Contains datablock Beta

	Structure factor file (CIF format) (46.6 kbytes) Contains datablock Delta

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