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Perimidine-based squaraine dyes have shown absorbance over 800 nm. Numerous squaraine dyes have been synthesized over the years, but they have not been able to utilize the entire NIR window. The use of 2,3-dihydro-1H-perimidines heterocycle has generated compelling results in optical properties. The larger conjugated heterocycle allows for a redshift in absorbance beyond 800 nm. Herein, the synthesis and characterization of the red shifted probes are reported.
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Perimidine-based squaraine dyes have shown absorbance over 800 nm. Numerous squaraine dyes have been synthesized over the years, but they have not been able to utilize the entire NIR window. The use of 2,3-dihydro-1H-perimidines heterocycle has generated compelling results in optical properties. The larger conjugated heterocycle allows for a redshift in absorbance above 800 nm.
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