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Bright Near-Infrared Dyes
K. Umezawa, A. Matsui, Y. Nakamura, D. Citterio, K. Suzuki*
Keio University, Yokohama, Japan
23 March 2009 (online)
Borondipyrromethene (BODIPY) dyes, 4a-e were synthesized in moderate yields from 5-substituted 2-furaldehydes. Dyes 4a-e have large absorption coefficients, sharp absorption and emission bands and are highly fluorescent. Dyes with a wide range of absorption (542-723 nm) and emission (549-738 nm) maxima could be accessed by changing the 5-aryl substituent of the starting 2-furaldehyde.