SYNTHESIS AND LIQUID-CRYSTALLINE BEHAVIOR OF A SERIES OF FERROCENE 1,1'-BIS-AZINO-DERIVATIVES

A series of liquid-crystalline ferrocene derivatives, e{C5H4-C(CH3)=N- N=CH-C6H3(X)-OOC-C6H4-OCnH2n+1}(2) (X = H, OH; n = 3 to 12), were obta ined by the condensation of 1,1'-bishydrazondiacetylferrocene with p-a lkoxybenzoyloxybenzaldehides. According to DSC and polythermic microsc opy, all of the compounds exhibit an enantiotropic nematic mesophase i n the 150-230 degrees C temperature range. A polycrystalline transitio n precedes the nematic transition. The liquid crystalline properties o f the obtained compounds were investigated with respect to the number of carbon atoms in the terminal alkyl chain and the terminal hydroxyl group. The composition and structure of the obtained compounds were de termined by elemental analysis and IR and NMR spectroscopy.