X-Ray Diffraction Studies of the Solid Phases of Cholesteryl Acetate

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Abstract
The solid phases of cholesteryl acetate were studied by x-ray diffraction techniques. The data were analyzed in terms of the angular position of the reflections, their intensity, and their integral width. The unit cell is monoclinic with the parameters a, b, c, and β respectively equal to 10.00 A, 7.36 A, 37.2 A and 95°. The space group is either c2 or cm. The dimensions of the unit cell are the same for all three solid phases. Temperature dependent measurements show that the broad melting range of the transition into the isotropic phase is not a true melting range. Increasing lack of short range order occurring along the direction of the long axis of the molecule causes an increase of the expansion coefficient in that range.

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