Synthesis and Optical Properties of Near-Infrared Absorbing Cyanine Dyes with Reactive Hydroxy

In this paper, two cyanine dyes with active hydroxyl were synthesized using 1, 1, 3, 3-tetraethoxypropanecondensed with two quaternary ammonium salt. The dyes’ structure were characterized by nuclear magnetic resonance spectra and high resolution mass spectrometry. The absorption spectra of dyes were determined by UV-vis with DMF as solvent. The high voltage xenon lamp with current of 13.4A was used as the source of the lamp to study the light resistance of the dyes. The results showed that, the two cyanine dyes all have strong absorption in near infrared region, and the dyes that containing indole structure own higher λmax. The test of optical stability shows that the dyes with benzoindole nitrogen heterocyclic ring as the parent was more photostable and can be used as functional dyes.