The chromogenic responding ability increases as the substituent changes from phenyl to naphthyl or anthryl.

实验明，偶氮基团的引入改善了8-羟基喹啉的生色能力，并在乙腈溶液中随着取代基由苯基变为萘基和蒽基，物的吸收光谱发生红移。