A Diradical Approach towards BODIPY-Based Dyes with Intense Near-Infrared Absorption around λ=1100 nm.

Authors :: Ni Y
Lee S
Son M
Aratani N
Ishida M
Samanta A
Yamada H
Chang YT
Furuta H
Kim D
Wu J
Source :: Angewandte Chemie (International ed. in English) [Angew Chem Int Ed Engl] 2016 Feb 18; Vol. 55 (8), pp. 2815-9. Date of Electronic Publication: 2016 Jan 25.
Publication Year :: 2016
Abstract: A diradical approach to obtain stable organic dyes with intense absorption around λ=1100 nm is reported. The para- and meta-quinodimethane-bridged BODIPY dimers BD-1 and BD-2 were synthesized and were found to have a small amount of diradical character. These molecules exhibited very intense absorption at λ=1088 nm (ɛ=6.65×10(5) M(-1) cm(-1) ) and 1136 nm (ɛ=6.44×10(5) M(-1) cm(-1) ), respectively, together with large two-photon-absorption cross-sections. Structural isomerization induced little variation in their diradical character but distinctive differences in their physical properties. Moreover, the compounds showed a selective fluorescence turn-on response in the presence of the hydroxyl radical but not with other reactive oxygen species.<br /> (© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.)

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