For the first time, the photochemical properties of compounds 1–4 containing a cymantrene fragment at the 2‐ or 3‐position of the quinazolinone have been studied. It was found that the ‐NC=O group in compounds 1 and 2 is capable of coordinating to the Mn atom with the formation of intramolecular chelates. The influence of the nature of the solvent and substituent in the side‐chain of cymantrene on the thermodynamic and kinetic stability of the dicarbonyl complexes was studied. For the first time, the olefin chelate 9 was isolated; its structure was established by X‐ray diffraction analysis and its photochemical and fluorescence properties were studied. The photolysis of compound 4 gave only stable intermolecular dicarbonyl complexes, in which the solvent can be easily replaced by n‐ and π‐donor ligands.

中文翻译：

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环烯基喹唑啉酮衍生物的光化学转化的光谱研究

首次，化合物的光化学性质1 - 4含有喹唑啉酮的2-或3-位上的cymantrene片段进行了研究。发现化合物1和2中的-NC = O基团能够与Mn原子配位形成分子内螯合物。研究了环丙三烯侧链中溶剂和取代基的性质对二羰基配合物的热力学和动力学稳定性的影响。首次分离出烯烃螯合物9。通过X射线衍射分析确定其结构，并研究其光化学和荧光性质。化合物4的光解 只能得到稳定的分子间二羰基分子间配合物，其中溶剂可以很容易地被n和π供体配体取代。