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 Title: THE CONFORMATIONAL LANDSCAPE OF PERILLYL ALCOHOL REVEALED BY BROADBAND ROTATIONAL SPECTROSCOPY AND THEORETICAL MODELING Author(s): Xie, Fan Contributor(s): Xu, Yunjie ; Jäger, Wolfgang ; Thomas, Javix ; Heger, Matthias ; Seifert, Nathan A. Subject(s): Mini-symposium: Non-covalent Interactions Abstract: Perillyl alcohol (PA) is a naturally occurring dietary monoterpene that can be extracted from various plants, such as lavender and peppermint, and its application to human cancer treatment has been explored.$^{1}$ The rotational spectrum of PA has been investigated using a chirped-pulse Fourier transform microwave (FTMW) spectrometer and a cavity FTMW spectrometer. In parallel, we have carried out extensive conformational searches by scanning relevant dihedral angles and also using a semi-classical conformational search program, GFN-xTB.$^{2}$ In total, 108 conformers have been identified and confirmed to be true minima with the subsequent DFT calculations. The relative stabilities of the conformers identified and the interconversion barriers among them have been explored at the MP2/6-311++G(2d,p) and B3LYP-D3(BJ)/def2-TZVP levels of theory. Experimentally, 8 conformers have been assigned and the missing low energy conformers have been rationalized in terms of conformational conversion barriers under a jet expansion condition. A comprehensive study on the conformational distribution of PA may facilitate our understanding of its structural property and possible structural-functional relationship. 1 T. C. Chen, C. O Da Fonseca, A. H Schönthal. Am. J. Cancer Res. 2015, 5, 1580. 2. S. Grimme, C. Bannwarth, P. Shushkov, J. Chem. Theo. Comput. 2017, 13, 1989. Issue Date: 2019-06-17 Publisher: International Symposium on Molecular Spectroscopy Genre: Conference Paper / Presentation Type: Text Language: English URI: http://hdl.handle.net/2142/104258 DOI: 10.15278/isms.2019.MH09 Rights Information: Copyright 2019 Fan Xie Date Available in IDEALS: 2019-07-152020-01-25
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