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The solvatochromic behaviour of a series of indocyanine dyes (Dyes I–VIII) was investigated by quantum chemical calculations. The effect of the polymethine chain length and of the indolenine structure has been satisfactorily reproduced by semiempirical Pariser–Parr–Pople (PPP) calculations. The solvatochromism of 3,3,3′,3′-tetramethyl-N,N′-diethylindocarbocyanine iodide (Dye I) has been deeply investigated...
A series of novel functionalized, water-soluble, pH-unsensitive, highly photostable heptamethine cyanine dyes (HCDs) has been synthesized. The aim of the synthesis was to obtain novel effective probes for fluorescence detection in the near infrared. Synthesis and characterization of a special HCD with large Stokes’ shift (>100 nm), bioconjugation to IgG and effect of pH upon the new structure are...
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