Chemistry

Stackable Conductors

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Science  23 May 2003:
Vol. 300, Issue 5623, pp. 1205
DOI: 10.1126/science.300.5623.1205b

Compounds that form columnar discotic liquid crystalline phases, where the disc-shaped molecules align in stacks, are of particular interest for creating organic semiconducting materials because of the potential for overlapping orbitals along the length of the stack. Molecules containing the oxadiazole moiety have been examined in detail as conductors because of their high electron mobilities. Zhang et al. synthesized a family of tris(oxadiazole) molecules with benzene cores and examined the liquid crystalline and electron-conducting properties. Focusing on one member of this family, they found that it exhibited a columnar discotic phase from 38° to 211°C. Optical microscopy showed that the columnar structure was retained in the solid formed when the liquid crystalline state was cooled. The electron mobility of this material (between 10−3 to 10−4 centimeter squared per volt per second) is comparable to that of other oxadiazoles.—MSL

Langmuir, 10.1021/la0341456 (2003).

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