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Photostable NIR-II Pigments from Extended Rylenecarboximides.

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New organic absorbers, FNs and FPs, efficiently absorb light in the NIR-II region (870–1100 nm). Their synthesis is high-yielding and avoids complex purification, making them suitable for various applications.

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Area of Science:

  • Organic chemistry
  • Materials science
  • Spectroscopy

Background:

  • Near-infrared (NIR) organic absorbers are crucial for advanced optical applications.
  • The second near-infrared region (NIR-II) offers unique advantages for light absorption and emission.

Purpose of the Study:

  • To synthesize novel organic absorbers in the NIR-II region.
  • To develop efficient and scalable synthetic routes for these materials.
  • To characterize the photophysical properties of the synthesized compounds.

Main Methods:

  • Aryl-amination reactions between dicarboximide derivatives (NMI-NH2, PMI-NH2) and chloro-anthraquinones.
  • Base-induced cyclodehydrogenation for forming extended aromatic cores.
  • De-alkylation of soluble precursors to yield NIR-II pigments.

Main Results:

  • A series of NIR-II organic absorbers (FNs and FPs) with absorption maxima from 870 nm to 1100 nm were synthesized.
  • A photostable NIR-II pigment (FPP) was obtained via a high-yielding de-alkylation process.
  • The synthetic strategy avoids column chromatography, enhancing practicality.

Conclusions:

  • The developed synthetic methods provide access to novel NIR-II organic absorbers.
  • The synthesized compounds exhibit promising properties for applications requiring NIR-II absorption.
  • The avoidance of chromatographic purification represents a significant advantage for industrial scalability.