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Pengshung, Monica; Li, Jingbai; Mukadum, Fatemah; Lopez, Steven A; Sletten, Ellen M
Organic letters, 08/2020, Volume: 22, Issue: 15Journal Article
Optical imaging in the shortwave infrared region (SWIR, 1000–2000 nm) provides high-resolution images in complex systems. Here we explore substituent placement on dimethylamino flavylium polymethine dyes, a class of SWIR fluorophores. We find that the position of the substituent significantly affects the λmax and fluorescence quantum yield. Quantum-mechanical calculations suggest that steric clashes control the extent of π-conjugation. These insights provide design principles for the development of fluorophores for enhanced SWIR imaging.
