Guo Hao-Xuan, Higashida Riho, Aota Hiroyuki
Department of Chemistry and Materials Engineering, Kansai University, Suita 564-8680, Japan.
Polymers (Basel). 2023 Jun 19;15(12):2738. doi: 10.3390/polym15122738.
Bandgap and energy levels are crucial for developing new electronic and photonic devices because photoabsorption is highly dependent on the bandgap. Moreover, the transfer of electrons and holes between different materials depends on their respective bandgaps and energy levels. In this study, we demonstrate the preparation of a series of water-soluble discontinuously π-conjugated polymers through the addition-condensation polymerization of pyrrole (Pyr), 1,2,3-trihydroxybenzene (THB) or 2,6-dihydroxytoluene (DHT), and aldehydes, including benzaldehyde-2-sulfonic acid sodium salt (BS) and 2,4,6-trihydroxybenzaldehyde (THBA). To control the energy levels of the polymers, varying amounts of phenols (THB or DHT) were introduced to alter the electronic properties of the polymer structure. The introduction of THB or DHT into the main chain results in discontinuous conjugation and enables the control of both the energy level and bandgap. Chemical modification (acetoxylation of phenols) of the polymers was employed to further tune the energy levels. The optical and electrochemical properties of the polymers were also investigated. The bandgaps of the polymers were controlled in the range of 0.5-1.95 eV, and their energy levels could also be effectively tuned.
带隙和能级对于开发新型电子和光子器件至关重要，因为光吸收高度依赖于带隙。此外，不同材料之间电子和空穴的转移取决于它们各自的带隙和能级。在本研究中，我们展示了通过吡咯（Pyr）、1,2,3 - 三羟基苯（THB）或2,6 - 二羟基甲苯（DHT）与醛（包括苯甲醛 - 2 - 磺酸钠盐（BS）和2,4,6 - 三羟基苯甲醛（THBA））的加成缩聚反应制备一系列水溶性非连续π共轭聚合物。为了控制聚合物的能级，引入了不同量的酚（THB或DHT）以改变聚合物结构的电子性质。将THB或DHT引入主链会导致非连续共轭，并能够控制能级和带隙。采用聚合物的化学改性（酚的乙酰氧基化）进一步调节能级。还研究了聚合物的光学和电化学性质。聚合物的带隙控制在0.5 - 1.95 eV范围内，并且它们的能级也可以有效地调节。
