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A Diradical Approach towards BODIPY‐Based Dyes with Intense Near‐Infrared Absorption around λ=1100 nm |
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| Authors: | Dr Yong Ni Sangsu Lee Minjung Son Prof?Dr Naoki Aratani Masatoshi Ishida Dr Animesh Samanta Prof?Dr Hiroko Yamada Prof?Dr Young‐Tae Chang Prof?Dr Hiroyuki Furuta Prof?Dr Dongho Kim Prof?Dr Jishan Wu |
| Institution: | 1. Department of Chemistry, National University of Singapore, Singapore, Singapore;2. Laboratory of Bioimaging Probe Development, Singapore Bioimaging Consortium, Singapore, Singapore;3. Spectroscopy Laboratory for Functional π-Electronic Systems and Department of Chemistry, Yonsei University, Seoul, Korea;4. Graduate School of Materials Science, Nara Institute of Science and Technology, Ikoma, Japan;5. Education Center for Global Leaders in Molecular Systems for Devices, Kyushu University, Nishi-ku, Fukuoka, Japan;6. Institute of Materials Research and Engineering, A*STAR, Singapore, Singapore |
| 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 (?=6.65×105 M ?1 cm?1) and 1136 nm (?=6.44×105 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. |
| Keywords: | BODIPY dyes/pigments fluorescence radicals reactive oxygen species |