Collect. Czech. Chem. Commun. 1990, 55, 2066-2073

Some novel heptamethine pyrylium dyes. Structure and photostability

Weimei Luo, Zhenghua Zhu, Zhuguang Yao and Mengzhen He

East China University of Chemical Technology, 200237 Shanghai, P. R. China


A series of new heptamethine pyrylium dyes derived from enamine and enaminium salts has been prepared. Spectral absorptions of these dyes range from 850 nm to 1160 nm. Relation between the structure and chromophore has been discussed and kinetic study has been made on the configuration isomerization of the dyes. Photostability has been investigated in relation to the chemical structure.