A series of N,O-chelated azine-enol boron complexes featuring four different fusion patterns between the benzene and pyridine rings of the azine fragment was synthesized and characterized. The optical properties of the corresponding complexes have been assessed in dichloromethane solution and in solid state. In the latter case the assessment was performed for both powder samples as well as batches of single crystals allowing to identify several cases of mechanochromism and one case of polymorphism-dependent emission. The correlations between the type of crystal packing and the emission strength of the crystalline samples have been pointed out.

中文翻译：

---

N,O-螯合吖嗪-烯醇硼配合物光学性质的研究

合成并表征了一系列 N,O-螯合吖嗪-烯醇硼配合物，这些配合物在吖嗪片段的苯环和吡啶环之间具有四种不同的融合模式。已在二氯甲烷溶液和固态下评估了相应配合物的光学性质。在后一种情况下，对粉末样品和单晶批次进行了评估，从而可以识别几种机械致色现象和一种多态性相关发射情况。指出了晶体堆积类型与晶体样品发射强度之间的相关性。