Abstract
The polymorphism is discussed of a series of hydrocarbons that show, besides a smectic‐A phase, a strong tendency towards the formation of smectic‐B. The powder x‐ray diffraction patterns show at large Bragg angles an unusual double reflection with a very small separation, which indicates a 3D hexagonal closed packing. It is shown that, quite generally, nonpolar molecules form orthogonal smectic phases. The implications are discussed for the relationship between molecular structure and smectic behavior.
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