Boron heterocycles represent an important subset of heteroatom-incorporated rings, attracting attention from organic, inorganic, and materials chemists. The empty p_z orbital at the boron center makes them stand out as quintessential Lewis acidic molecules, also serving as a means to modulate electronic structure and photophysical properties in a facile manner. As boracycles are ripe for extensive functionalization, they are used in catalysis, chemical biology, materials science, and continue to be explored as chemical synthons for conjugated materials and reagents. Neutral boron(III)-incorporated polycyclic molecules are some of the most studied types of boracycles, and understanding their redox transformations is important for applications relying on electron transfer and charge transport. While relevant redox species can often be electrochemically observed, it remains challenging to isolate and characterize boracycles where the boron center and/or polycyclic skeleton have been chemically reduced.

中文翻译：

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5、6 和 7 元硼杂环的氧化还原和电荷态依赖性趋势：硼环阳离子、阴离子和自由基的中性配体配位化学方法


硼杂环代表杂原子结合环的重要子集，吸引了有机、无机和材料化学家的关注。硼中心的空 p _z 轨道使它们成为典型的路易斯酸性分子，也可以作为一种轻松调节电子结构和光物理性质的手段。由于长硼环的广泛功能化已经成熟，它们被用于催化、化学生物学、材料科学，并作为共轭材料和试剂的化学合成子继续被探索。中性硼（III）掺入的多环分子是研究最多的硼环化合物类型之一，了解它们的氧化还原转变对于依赖电子转移和电荷传输的应用非常重要。虽然相关的氧化还原物质通常可以通过电化学方法观察到，但分离和表征硼中心和/或多环骨架已被化学还原的硼环仍然具有挑战性。