S1 Supporting Information Stepwise Deprotonation of Sumanene: Electronic Structures, Energetics and Aromaticity Alterations Qi Xu, a Marina A. Petrukhina, b Andrey Yu. Rogachev a* a Department of Chemistry, Illinois Institute of Technology, Chicago, IL 60616, USA b Department of Chemistry, University at Albany, State University of New York, Albany, NY 12222, USA. To whom correspondence should be addressed: E-mail: andrey.rogachev@gmail.com and/or andrey.rogachev@iit.edu (A.Yu. Rogachev) Electronic Supplementary Material (ESI) for Physical Chemistry Chemical Physics. This journal is © the Owner Societies 2017