A number of photochromic spiropyrans and spirooxazines containing mesogenic groups were synthesized. Only one of them, spiro-indoline-naphthoxazine with mesogenic substituent, 4-(4-heptylbenzoyloxy)benzoyloxy in 5-position, revealed mesomorphic properties. Its phase behaviour, photochromism and alignment in the electric field was investigated. A structure of the mesophase is discussed.
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We thank Dr. Judith Ratner for assistance with spectral measurements and Prof. Ernst Fischer for stimulating discussions. Support from the German-Israeli Foundation for Scientific Research and Development is gratefully acknowledged.