Two new series (A & B) of three materials each based on the aroyl
hydrazinato-nickel (II) complex were synthesized and characterized. The core
molecule in these series consists of two 4-benzoyloxy benzylidene moieties and
two benzene rings attached at the azomethine moiety. These latter benzene rings
have one or two alkoxy chains comprised of either 10, 12, 16 or 18 carbon
atoms. The characterization of these two series
by polarized optical microscopy and differential scanning calorimetry is
described herein. Upon cooling from the Isotropic phase, three of the six
materials display a monophasic columnar phase and the other three possess a biphasic
nematic and columnar phases. Upon heating, all six materials have a clearance
point at high temperatures without displaying mesomorphic behavior. In series B
mesogens, it was observed that the longer the hydrocarbon tail length, the
lower the clearance point.
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