A Highly Efficient Near-Infrared-Emissive Copolymer with a N=N Double-Bond π-Conjugated System Based on a Fused Azobenzene-Boron Complex
A Highly Efficient Near-Infrared-Emissive Copolymer with a N=N Double-Bond π-Conjugated System Based on a Fused Azobenzene-Boron Complex
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DOI：
10.1002/anie.201803013
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发表时间：
2018-05-28
影响因子：
16.6
通讯作者：
Chujo, Yoshiki
中科院分区：
文献类型：
--
作者：
Gon, Masayuki;Tanaka, Kazuo;Chujo, Yoshiki
光学测量表明，氮氮双键（N=N）的本征电子缺陷和硼氮（B-N）配位极大地降低了偶氮配体的最低未占据分子轨道（LUMO）的能量，使得偶氮-硼配合物（BAz）成为一个强电子受体。双噻吩（BT）与BAz的简单给受体（D-A）型共聚物在稀释溶液(lambda（PL) = 751 nm, Phi(PL) = 0.25）和薄膜(lambda（PL) = 821 nm, Phi(PL) = 0.038）中均表现出较强的近红外区光致发光（PL）。BAz单体在稀溶液中表现出轻微的PL，并检测到聚集诱导发射（AIE）。我们提出N=N双键应该是设计π共轭材料的有吸引力和功能的构建块。
Fused azobenzene-boron complexes (BAzs) show highly efficient near-infrared (NIR) emission from, the nitrogen nitrogen double bond (N=N)containing pi-conjugated copolymer Optical measurements showed that BAz worked as a strong electron-acceptor because of the intrinsic electron deficiency of the N=N double bond and the boron-nitrogen (B-N) coordination which dramatically lowered the energy of the lowest unoccupied molecular orbital (LUMO) of the azobenzene ligand. The simple donor acceptor (D-A) type copolymer of bithiophene (BT) and BAz exhibited intense photoluminescence (PL) in the NIR region both in the dilute solution (lambda(PL) = 751 nm, Phi(PL) = 0.25) and in the film (lambda(PL) = 821 nm, (Phi(PL) = 0.038). The BAz monomer showed slight PL in the dilute solution, and aggregation-induced emission (AIE) was detected We proposed that N=N double bonds should be attractive and functional building blocks for designing pi-conjugated materials.