Kerber Leon A, Kreuz Oliver, Ring Tom, Braun Hendrike, Berger Robert, Reich Daniel M
Dahlem Center for Complex Quantum Systems and Fachbereich Physik, Freie Universität Berlin, D-14195, Berlin, Germany.
Fachbereich Chemie, Philipps-Universität Marburg, D-35032, Marburg, Germany.
Chemphyschem. 2025 Mar 15;26(6):e202400898. doi: 10.1002/cphc.202400898. Epub 2025 Feb 4.
Quantum chemical calculations of one-photon absorption, electronic circular dichroism and anisotropy factor spectra for the A-band transition of fenchone, camphor and 3-methylcyclopentanone (3MCP) are reported. While the only weakly allowed nature of the transition leads to comparatively large anisotropies, a proper theoretical description of the absorption for such a transition requires to account for non-Condon effects. We present experimental data for the anisotropy of 3MCP in the liquid phase and show that corresponding Herzberg-Teller corrections are critical to reproduce the main experimental features. The results obtained with our comprehensive theoretical model highlight the importance of the vibrational degree of freedom, paving the way for a deeper understanding of the dynamics in electronic circular dichroism.
报道了对葑酮、樟脑和3-甲基环戊酮(3MCP)的A带跃迁的单光子吸收、电子圆二色性和各向异性因子光谱的量子化学计算。虽然跃迁仅具有弱允许性质导致相对较大的各向异性,但对这种跃迁的吸收进行适当的理论描述需要考虑非康登效应。我们给出了3MCP在液相中的各向异性实验数据,并表明相应的赫兹伯格-泰勒校正对于再现主要实验特征至关重要。用我们的综合理论模型获得的结果突出了振动自由度的重要性,为更深入理解电子圆二色性中的动力学铺平了道路。