أنواع جديدة من أشباه موصلات بلورية سائلة
Abstract
Abstract Synthesis and characterization were achieved for four mesogenic complexes of shiff’s bases (mesogenic legands) with ions of (Cu+2, Ni+2) as the following structures: (DMeOBB) (NO2BB) (DMeOBB-Cu+2 , DMeOBB-Ni+2 , NO2BB-Cu+2 , NO2BB-Ni+2 ) The liquid crystal complexes have been characterized by a spectrophotometer Infrared (IR), Ultra violet (UV), polarizing microscope equipped with heating stage, Flam. atomic absorption spectrophotometer, Differential scanning calorimeter (DSC), and Thermal gravimetry analysis (TG), techniques were found to be nematic (enantiotropic). The electrical measurements (D.C, and A.C) of these compounds and their complexes have been investigated. The molar conductivity measurements for the liquid crystal compounds (Schiff’s bases) have shown that the free liquid crystal compounds (twin dimmers) are non electrolyte solutions, where as it’s effect of complexation with (Cu+2,Ni+2) on the (D.C) and (A.C) values have been clear when the (D.C) electrical conductivity ranged from (10-12) to (9-10)(ohm.cm)-1 lies in the usual range of organic semiconductors. The (A.C) electrical conductivity increases in the range of (10-11) to (10-6)(ohm.cm)-1. In this work, it is found that the (D.C) conductivity increases with the following trend:(DMeOBB-Cu+2) > (DMeOBB-Ni+2) > (NO2BB-Cu+2) > (NO2BB-Ni+2)
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