Acta Crystallographica Section C

Crystal Structure Communications

Volume 58, Part 10 (October 2002)

Acta Cryst. (2002). C58, o615-o618 [doi:10.1107/S0108270102015822]

The low-temperature phase transition of 9-methylfluoren-9-ol: comparison of the crystal structures at 100 and 200 K

D. G. Morris, K. W. Muir and K. S. Ryder

Abstract: Crystals of 9-methylfluoren-9-ol, C₁₄H₁₂O, undergo a reversible phase transition at 176 (2) K. The structure of the high-temperature [alpha] form at 200 K is compared with that of the low-temperature [beta] form at 100 K. Both polymorphs crystallize in space group P $\overline 1$ with Z = 4 and contain discrete hydrogen-bonded R ${_4^4}$ (8) ring tetramers arranged around crystallographic inversion centres. The most obvious changes observed on cooling the crystals to below 176 K are an abrupt increase of ca 0.5 Å in the shortest lattice translation, and a thermal transition with [Delta] H = 1 kJ mol^-1.

Formula: C₁₄H₁₂O at 100 and 200 K

Online 30 September 2002


	Structure factor file (CIF format) (227.9 kbytes) Contains datablock I_100K

	Structure factor file (CIF format) (303.9 kbytes) Contains datablock I_200K

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