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. 2017 Mar 21;7:284. doi: 10.1038/s41598-017-00368-5

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© The Author(s) 2017

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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CCX-I and CCX-II. Electron-donating and electron-accepting units are indicated by red and blue, respectively. α is the torsion angle between the electron-donating and electron-accepting units. The isosurface value for the HOMOs and LUMOs is 0.02 a.u.