Starburst oxadiazole glasses are obtained by the reaction of aromatic tetrazoles with acid chlorides. The synthesis and thermal properties of these novel compounds are described. One of the glasses—unlike the others, which recrystallize when heated above their glass‐transition temperatures–is stable up to 350°C and is thus the first example of a stable amorphous molecular material with oxadiazole units. Low molecular weight organic compounds that form stable glasses are of interest for applications as photoconductors or light‐emitting devices.
The synthesis and characterization of two unsymmetrically substituted star-shaped oxadiazoles and of a dendrimer of the first generation are described. The key step in the synthesis is the intramolecular ring transformation of aromatic tetrazoles. The welldefined compounds form stable amorphous glasses with high glass transition temperatures up to 222°C. They are promising candidates for organic light emitting diodes.
Articles you may be interested inPhotostimulated electron detrapping and the two-state model for electron transport in nonpolar liquidsIn this article we report on the electron mobility of a starburst oxadiazole, 1,3,5 -͓͑4-tert.-butylphenyl͒-2-oxadiazolyl͔ benzene. For direct evidence of the electron transport capability the charge drift mobility and its field dependence have been measured by the time-of-flight technique. The electron mobility showed a square root dependence of the electric field and was somewhat larger than that for PBD. In addition, the oxadiazole compound has been used as the electron transport layer ͑ETL͒ in light-emitting diodes ͑LEDs͒ together with poly͑1,4-phenylene vinylene͒. The characteristics of these devices are compared to analogous LEDs with Alq 3 as the ETL.
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