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Short Paper | Special issue | Vol 95, No. 2, 2017, pp.1167-1176
Published online, 31st January, 2017
DOI: 10.3987/COM-16-S(S)65
Syntheses and Photophysical Properties of Aminobenzopyranoxanthene Dyes Containing Various Alkyl Chains at Amine Moieties

Shinichiro Kamino,* Masaru Tanioka, Daisuke Sawada, and Shuichi Enomoto*

*Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama-shi, Okayama 700-8530, Japan


Aminobenzopyranoxanthene (ABPX) dyes containing linear n-alkyl chains at amino groups were synthesized, and their cis and trans stereoisomers were isolated. Detailed spectrophotometric studies revealed that all the ABPX derivatives exhibited fluorescence emission in the far-red and near-infrared wavelength regions, and their fluorescence quantum efficiency increased with increasing n-alkyl chain length. Almost no differences in photophysical properties were observed between the cis and trans stereoisomers.