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Paper | Regular issue | Vol 65, No. 6, 2005, pp.1385-1392
Published online, 12th April, 2005
DOI: 10.3987/COM-05-10395
Preparation and Properties of Dehydrotrichotomine-type Dyes: A New Near-Infrared Absorbing Indigoid

Hiroyuki Hashimoto, Kimiaki Shiratori, Keitaro Kawakita, Tomoaki Tanaka, Rika Sekine, and Hajime Irikawa*

*Department of Chemistry, Faculty of Science, Shizuoka University, 836 Ohya, Shizuoka 422-8529, Japan


Dehydrotrichotomine-type dyes have been prepared from Pechmann dyes and shown to exhibit the λmax at near-infrared region. The large bathochromic shift (109 nm) caused by introduction of a double bond into the trichotomine-type chromophore suggests that the dehydrotrichotomine-type dyes have a different intrinsic chromophore, and are regarded as a new indigoid.