Mono-/diboron complexes with saddle-shaped molecular conformations were synthesized from porphyrins(2.1.2.1). The boron complexes have unique structure-dependent photophysical properties: (a) monoboron complexes 2a and 2b are not emissive in solution and the solid state, (b) diboron complex 3a shows red emission in toluene, and (c) diboron complex 3b shows aggregation-induced emission (AIE) in the deep-red region due to intermolecular secondary interactions (F–π). This is the first case of a boron porphyrinoid complex that shows AIE emission in the deep-red region in decades.

中文翻译：

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卟啉（2.1.2.1）双硼配合物作为由分子间 F-π 相互作用诱导的深红色 AIE 发光体

由卟啉(2.1.2.1)合成了具有马鞍形分子构象的单硼/二硼配合物。硼配合物具有独特的结构依赖性光物理性质：（a）单硼配合物2a和2b在溶液和固态中不发光，（b）二硼配合物3a在甲苯中显示红色发射，（c）二硼配合物 3b 显示聚集由于分子间二次相互作用（F-π），在深红色区域中的诱导发射（AIE）。这是几十年来在深红色区域显示 AIE 发射的首例硼卟啉复合物。