Absorption and fluorescence spectra as well as quantum yields of a series of differently substituted carbostyrils (quinolin-2 (1H)-ones) are reported. Especially for compounds containing donor substituents in position 6, substantial bathochromic shifts (comparable to analogous coumarins) of both absorption as well as fluorescence transitions are obtained. High absorption intensities and quantum yields are found for 7-donor substituted isomers. ...
