SYNTHESES AND PHYSICAL-PROPERTIES OF FERROCENE DERIVATIVES (VI)CRYSTAL-STRUCTURE OF A LIQUID-CRYSTALLINE FERROCENE DERIVATIVE, TERYLOXYCARBONYL)HEXYLOXYCARBONYL]PHENYL]FERROCENE

The structure of monosubstituted ferrocene derivative which has a flex ible spacer between the ferrocene and the mesogenic group, teryloxycar bonyl)hexyloxycarbonyl]phenyl]ferrocene was determined by the X-ray di ffraction method. The two crystallographically unequivalent molecules A and B exist in the unit cell. The molecular geometry is almost exten ded and linear, and the two cyclopentadienyl rings exhibit an eclipsed conformation rather than a staggered one in both molecules. The gauch e conformation at the ferrocenyl side end of the hexyl chain in molecu le B can be lead to efficient packing, in which the tetracyclic cores overlap antiparallel as well as avoid close contact with ferrocene in molecule A. The molecules are arranged in layers which is layers which is a precursor to a smectic phase.