A water-soluble bis-1,3,5-trihydroxybenzene squaraine dye (t-OH-SQ) with a D-π-A-π-D conjugated structure was identified and prepared. After its structure was characterized by FTIR, 1H NMR and elemental analysis, the UV-Vis absorption and fluorescent spectra of the target dye were studied in detail. The results showed that t-OH-SQ combining multi-hydroxyl groups possessed excellent optical properties changing with pH and solvents. In aqueous solution under physiological pH ~ 7–8, it had especially high near-infrared fluorescence, which might be a latent application for cell fluorescent imaging.
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Published in Zhurnal Prikladnoi Spektroskopii, Vol. 82, No. 4, pp. 628–631, July–August, 2015.
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Hu, L., Yuan, H., Li, Q.Q. et al. Spectral Properties of a Water-Soluble Squaraine Dye and Its Application in Cell Fluorescent Imaging. J Appl Spectrosc 82, 665–668 (2015). https://doi.org/10.1007/s10812-015-0160-6
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DOI: https://doi.org/10.1007/s10812-015-0160-6