In this study, we present the synthesis and analysis of a novel, air-stable, and solvent-resistant phosphaalkene switch. Using this symmetric switch, we have demonstrated degenerate photoisomerization experimentally for the first time. With a combination of photochemical-exchange NMR spectroscopy, ultrafast transient absorption spectroscopy, and quantum chemical calculations, we elucidate the isomerization mechanism of this symmetric phosphaalkene. Our findings highlight the critical role of the isolobal analogy between C=P and C=C bonds in governing nanoscale molecular motion and break new ground for our understanding of light-induced molecular processes in symmetric heteroalkene systems.

中文翻译：

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探测对称磷酸烯开关的隐藏光异构化


在本研究中，我们提出了一种新型、空气稳定且耐溶剂的磷酸烯开关的合成和分析。使用这种对称开关，我们首次通过实验证明了简并光异构化。结合光化学交换 NMR 波谱、超快瞬态吸收波谱和量子化学计算，我们阐明了这种对称磷二烯的异构化机制。我们的研究结果强调了 C=P 和 C=C 键之间的等叶类比在控制纳米级分子运动中的关键作用，并为我们理解对称杂烯系统中的光诱导分子过程开辟了新天地。