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> On Sep 6, 2016, at 8:07 PM, WENHE ZHONG <[log in to unmask]> wrote: > > I am not very familiar with the chemistry in terms of π-stacking. So I am wondering whether it is a T-shaped stacking interaction between the aromatic rings? Any thought? Dear Wenhe: Please take a look at these references: Aromatic-Aromatic Interaction: A Mechanism of Protein Structure Stabilization S. K. Burley and G. A. Petsko Science Vol. 229, No. 4708 (Jul. 5, 1985), pp. 23-28 Stable URL: http://www.jstor.org/stable/1695415 also, the basis in pi orbital stabilization interactions comes from this, I believe: Symmetry, Topology and Aromaticity, M. J. Goldstein and Roald Hoffmann. Journal of the American Chemical Society / 93:23 / November 17,1971 https://www.dropbox.com/s/y7blru2u37dsfiu/67s_0.pdf William G. Scott Director, Program in Biochemistry and Molecular Biology Professor, Department of Chemistry and Biochemistry and The Center for the Molecular Biology of RNA University of California at Santa Cruz Santa Cruz, California 95064 USA http://scottlab.ucsc.edu