This paper reports on UV-stimulated synthesis of methylcyanotriacetylene carried out in cryogenic rare gas matrixes via coupling of smaller precursors: propyne and cyanodiacetylene. The detection was possible due to the strong visible ã ³A′ → X̃ ¹A₁ phosphorescence of CH₃C₇N, discovered in the course of this work. The ensuing measurements of electronic spectroscopy revealed the formally forbidden B̃ ¹E–X̃ ¹A₁ system, as well as the allowed one Ẽ ¹A₁–X̃ ¹A₁, with origins at approximately 3.32 and 5.4 eV, respectively. It was also possible to revisit the spectroscopic characterization of cyanotriacetylene, HC₇N, formed in parallel to the title photoproduct. Spectral assignments were assisted with a density functional theory study.

中文翻译：

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甲基氰基三乙炔的低温合成和发磷光

本文报道了通过低温前驱体丙炔和氰基二乙炔的偶合，在低温稀有气体基质中进行的紫外线激发的甲基氰基三乙炔的合成。检测由于强烈的可见是可能的³ A'→X ¹阿₁的CH磷光₃ Ç ₇ N，在该工作过程中发现的。电子光谱的随后的测量显示在正式禁止乙¹ E-X ¹阿₁系统，以及允许一个E ¹一₁ -X ¹阿₁，其原点分别约为3.32和5.4 eV。还可以重新研究与标题光产物平行形成的氰基三乙炔HC ₇ N的光谱表征。光谱分配得到密度泛函理论研究的协助。