作者:Mitsunori Nakamura、Hiroyuki Tahara、Kohtaro Takahashi、Toshi Nagata、Hiroki Uoyama、Daiki Kuzuhara、Shigeki Mori、Tetsuo Okujima、Hiroko Yamada、Hidemitsu Uno
DOI:10.1039/c2ob25930c
日期:——
Benzene-fused bis-(borondipyrromethene)s (bis-BODIPYs) were synthesized by retro-DielsâAlder reaction of the corresponding bicyclo[2.2.2]octadiene-fused (BCOD-fused) bis-BODIPYs, which were, in turn, prepared from 4,8-ethano-4,8-dihydropyrrolo[3,4-f]isoindole derivatives. The Ï-fused bis-BODIPY chromophores were designed to show intensive absorption and strong fluorescence in the near-infrared region and not to have any strong absorption in the visible region. A 6,10-dibora-5a,6a,9a,10a-tetraaza-s-indaceno[2,3-b:6,5-bâ²]difluorene derivative (syn-bis-benzoBODIPY) obtained by a thermal retro-DielsâAlder reaction of the corresponding BCOD-fused BODIPY dimer has strong absorption and emission bands at 775 and 781 nm, respectively. The absolute quantum yield is 0.36. The absorption is more than 5.0 times stronger than other absorptions observed in the visible region. In the case of 6,15-dibora-5a,6a,14a,15a-tetraaza-s-indaceno[2,3-b:6,7-bâ²]difluorene derivatives (anti-bis-benzoBODIPY), the absorption and emission maxima exceed 840 nm.
通过对相应的双环[2.2.2]辛二烯融合(BCOD-fused)双 BODIPYs 进行逆-DielsâAlder 反应,合成了苯融合双(硼二吡咯并二酮)(bis-BODIPYs),而这些双 BODIPYs 又是由 4,8-ethano-4,8-dihydropyrrolo[3,4-f]isoindole 衍生物制备的。融合的双 BODIPY 发色团在近红外区域表现出强吸收和强荧光,而在可见光区域没有任何强吸收。由相应的 BCOD 融合 BODIPY 二聚体通过热逆-DielsâAlder 反应得到的 6,10-二硼-5a,6a,9a,10a-四氮杂-s-茚并[2,3-b:6,5-bâ²]二芴衍生物(syn-biszoBODIPY)在 775 和 781 nm 处分别有强吸收带和发射带。绝对量子产率为 0.36。该吸收比在可见光区域观察到的其他吸收强 5.0 倍以上。至于 6,15-二硼-5a,6a,14a,15a-四氮杂-s-茚并[2,3-b:6,7-bâ²]二芴衍生物(抗-双苯并-BODIPY),其吸收和发射最大值超过了 840 纳米。