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Abstract
(E)-3-Methyl-2-(4-thiomorpholinostyryl)benzo[d]thiazol-3-ium iodide 1 was prepared by a convenient and reliable reaction procedure. The slight molar excess of the starting benzaldehyde and the mixture of ethanol: ethyl acetate in the ratio 3:1 as a solvent afforded a pure reaction product. The photophysical properties of the dye in a TE buffer in the absence and presence of double-stranded DNA (dsDNA) were elucidated. The low intrinsic fluorescence of 1 in TE buffer is followed by an increase in the fluorescence after dsDNA binding. The dye is nontoxic for stem cells from apical papilla and the most concentrated fluorescence is detected in the cell nucleoli.
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