FLUORESCENCE OF CROWNED BUTADIENYL DYE AND ITS METAL COMPLEXES . ... The absorption and fluorescence spectra of complexes of styryl dye ( 1 ) with lithium, sodium, magnesium, and calcium cations in MeCN have been investigated. ... Styryl dye structures . ... On the analogy of early studied systems [4, 7], the great difference of the values of absorption and fluorescence spectra maxima of metal complexes is explained by the photoinduced excited state recoordination reaction in metal complexes. ...