Bracketing subtle conformational energy differences between self-solvated and stretched trifluoropropanol.
Bracketing subtle conformational energy differences between self-solvated and stretched trifluoropropanol.
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包围自溶剂化和拉伸三氟丙醇之间的细微构象能量差异
DOI:
10.1039/c4cp05868b
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发表时间:
2015
期刊:
影响因子:
--
通讯作者:
Martin A. Suhm
中科院分区:
文献类型:
--
作者:
Matthias Heger;Katharina E. Otto;Ricardo A. Mata;Martin A. Suhm
The intramolecular OH⋯F hydrogen bond in 3,3,3-trifluoropropanol (TFP) exerts a subtle stabilizing effect that, when compared to the non-fluorinated analog, reorders the five distinguishable conformers and widens the gap between the two most stable structures. Here, we combine findings from Raman spectroscopy in supersonic expansions and high-level quantum-chemical calculations to bracket the energy difference between the two most stable TFP structures at 1.7(5) kJ mol−1. The torsional potential energy surface suggests consecutive backbone and OH torsional motions for the conformer interconversion, which are discussed in the framework of supersonic jet cooling as a function of nozzle temperature. The picture of a bistable cold molecule with trans or gauche backbone emerges, in which the OH group controls the energy difference and modulates the high barrier separating the heavy atom frames.
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DOI:
--
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期刊:
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