Abstract
Abstract The three sheet-shaped palladium organyls 1a-c exhibit lyotropic nematic properties in apolar organic solvents. The occurrence of two nematic lyomesophases was verified by the investigation of the orientational properties of these liquid crystalline systems. In cells with obliquely deposited SiO x layers, the director of the high temperature phase N2 is aligned in a homogeneous, planar manner. In the low temperature phase N1, a different orientational pattern is observed. The specific pattern type depends on the deposition conditions of the SiO x layers. In samples homeotropically aligned in the N2 phase, the director is tilted away from the cell normal after the transition into the N1 phase. These changes of orientation are reversible. The experimental observations presented here support our proposed model for the structural change at the nematic-nematic phase transition.
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