| abstract |
A novel material capable of maintaining a stable absorption spectrum over a long period of time and emitting stable fluorescence is provided. An azobenzene derivative represented by the following general formula (I): [In general formula (I), R 1 represents a hydrogen atom, Ar 1 and Ar 2 each independently represent an arylene group or an aromatic heterocyclic ring that may have a substituent R, and R represents a halogen atom Ar 1 and Ar 2 bonded via an azo group, such as an atom, have at least two Rs, and a plurality of R may be the same or different, and X may be an alkylene which may contain a hetero atom Represents a group, X 1 represents —NH— or the like, Y represents a hydrogen atom or the like, a represents an integer in the range of 0 to 2, and m and n each independently represent a range of 1 to 8. And when m and n are integers of 2 or more, a plurality of Ar 1 and Ar 2 may be the same or different. [Selection figure] None |