We report a newly synthesized squaraine-based fluorescent dye (KSQ-2) with excellent and useful optical characteristics such as a sharp near-infrared (NIR) emission at 751 nm, an extremely high fluorescence quantum yield (φ=0.56 in cyclohexane), and linear positive solvatochromic properties in the spectral region around 780 nm.
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Umezawa et al. (2007) studied this question.
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