Purification and Single Crystal Growth of N-ethylcarbazole

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Abstract
N-ethylcarbazole of high purity, free from anthracene and sufficient for optical and electrical measurements, was obtained by the purification of synthesized N-ethylcarbazole. Purity was confirmed by the fluorescence lifetime in crystalline state being independent of the fluorescence wavelength. Single crystal growth of N-ethylcarbazole was successfully carried out according to the Bridgman method with very slow lowering speed of growth-vessel. N-ethylcarbazole of commercially available grade contains anthracene as a main impurity at more than 10−3 mole/mole, which is impossible to remove by the usual methods of purification including zone melting. No excimer fluorescence was observed in N-ethylcarbazole either in concentrated solution or in the molten or crystalline state, contrary to poly-N-vinylcarbazole.