A series of mono-reactive, water-soluble, indodicarbocyanine dyes based on 2,3-dimethyl-3-(4-sulfobutyl)-3H-indole-5-sulfonic acid was synthesized. These dyes contain two aromatic sulfo groups and in addition to (up to 3) sulfoalkyl groups in the indolenine end groups. The impact of the number and position of sulfobutyl groups on the spectral properties and photostabilities of the dyes free in solutions...
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