New benzo[e]indolinium cyanine dyes with two different fluorescence wavelengths

Three compounds, which comprise of benzo[e]indolinium luminophores with two different fluorescence wavelengths, have been synthesized. Those compounds have been prepared by condensation of benzo[e]indolinium and their counterpart aldehydes, and they were confirmed by H-NMR, MS, IR. The absorption and fluorescence spectra of them were tested. The influences of pH value and various solvents on their absorption and fluorescence spectra were summarized. At the same time, self-condensation of benzo[e]indolinium was found in the synthesis of three compounds above. [Copyright &y& Elsevier]