Spectral Characteristics of Highly Fluorescent 2-(N,N-dimethylamino)tryptanthrin

Jun Kawakami; Takuma Kadowaki; Mari Ikeda; Yoichi Habata; Shunji Ito; Haruo Kitahara

doi:10.14723/tmrsj.41.143

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Spectral Characteristics of Highly Fluorescent 2-(N,N-dimethylamino)tryptanthrin

Jun Kawakami, Takuma Kadowaki, Mari Ikeda, Yoichi Habata, Shunji Ito, Haruo Kitahara

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Keywords: Tryptanthrin, Near-infrared fluorescent dye, Solvatochromism, Intramolecular charge transfer

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2016 Volume 41 Issue 2 Pages 143-146

DOI https://doi.org/10.14723/tmrsj.41.143

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Abstract

We previously reported that 2-aminotryptanthrin (T2NH₂) possesses excellent photophysical properties such as wide-wavelength absorption and emission in the visible region and a high fluorescence quantum yield. It also exhibits large positive fluorescent solvatochromism. In this study, we synthesized 2-(N,N-dimethylamino)tryptanthrin (T2NMe₂), from which we expected a substantial bathochromic shift of the emission band to the near-infrared (NIR) region by acceleration of intramolecular charge transfer. As such, the emission maxima (λ_{f, max}) of T2NMe₂ in some solvents were observed in the NIR region.

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