| abstract |
Provided are a compound that generates an SHG signal but has suppressed generation of a TPF signal. Also provided is a cell examination method using the same. A compound for generating a second harmonic of light, the compound being an azobenzene derivative of formula (1), or a salt thereof. (R 1 and R 2 independently represent alkyl groups having 6-12 carbon atoms, and R 3 to R 18 independently represent substituents selected from hydrogen, halogens, alkyl groups, alkoxy groups, aryl groups, amino groups, hydroxyl groups, nitro groups, and cyano groups, but R 5 and R 6 , R 9 and R 10 , R 13 and R 14 , and R 17 and R 18 may combine together and form a ring structure having 5-7 carbon atoms. X represents –N + R 19 R 20 R 21 , a sulfonyl group, a carboxyl group, or an –OR group. Here, R 19 , R 20 , and R 21 independently represent straight-chain or branched alkyl groups having 1-5 carbon atoms, and –OR represents a monovalent polyalkylene oxide group terminated by an alkoxy group. a is 0 or 1, b is 0 or 1, and n is an integer of 1-10.) |