期刊
TETRAHEDRON
卷 62, 期 42, 页码 9840-9845出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tet.2006.08.039
关键词
spirooxazines; photochromism; synthesis; fluorescence; switching
Two novel photochromic spirooxazines, SO-NA1 and SO-NA2, containing a naphthalimide unit were synthesized. The imide group of naphthalimide unit is incorporated at the naphthoxazine fragment, thus giving strong electron-withdrawing effect favoring the long-lived merocyanine (MC) in the dark giving good colorability in solution. Remarkably, their open merocyanine (MC) forms exhibit significantly long lifetimes, almost three magnitudes longer than that of unsubstituted spironaphthoxazine (1). Moreover, the fluorescence of naphthalimide unit can be switched on and off by photoinduced conversion between the open and closed forms. (c) 2006 Elsevier Ltd. All rights reserved.
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