Department of Chemistry, Graduate School of Science, Nagoya University and CREST, Japan Science and Technology Agency, Furo, Chikusa, Nagoya, 464-8602, Japan.
Chem Asian J. 2012 Jun;7(7):1594-603. doi: 10.1002/asia.201200055. Epub 2012 Mar 30.
A series of diarene-fused 1,2-dihydro-1,2-diborins were prepared as a new B-B-bond-embedded polycyclic π-electron system. The reduction of these compounds with metals produced their corresponding dianions, the π-conjugation modes of which varied from 6π-conjugation within the central 1,2-diborin skeleton to 14π peripheral conjugation over the tricyclic skeleton, depending on the nature of the reduced biaryl framework. Moreover, the countercation to the dianions had a significant effect on the absorption spectra, with a dramatic color change from yellow to deep blue, depending on the distance between the tricyclic dianion skeleton and the countercation.
一系列并二苯稠合的 1,2-二氢-1,2-二硼烷被制备为新型的 B-B 键嵌入的多环 π-电子体系。这些化合物与金属的还原生成了它们相应的二阴离子，其 π-共轭模式从中心 1,2-二硼烷骨架内的 6π 共轭变化到三环骨架上的 14π 外围共轭，这取决于还原的联芳基骨架的性质。此外，二阴离子的抗衡阳离子对吸收光谱有显著影响，颜色从黄色到深蓝色的显著变化取决于三环二阴离子骨架和抗衡阳离子之间的距离。
