Skip to main content
. 2013 Aug 6;8(8):e71420. doi: 10.1371/journal.pone.0071420

Figure 1. Geometric parameters defining cation-pi interactions.

Figure 1

The distance, d, is calculated between the cation or divalent cation FSW and the centroid of the base ring represented by the purple sphere labelled p. The angle q is defined as the angle formed between the cation/FSW, the base centroid, and a point positioned normal to the plane of the base represented by the yellow sphere [3]. Parameter criteria for qualifying cation-pi interaction were d≤5.0Å and q≤50°. Terminal interaction between Tl+ and C1 in 1jgr is shown.