File Name : figure_s1.eps Caption : relative values of the eda components, obtained through of the change of the ru–n–o bond angle from 140 to 180°, to 312. color code: δδeint (blue), δδvelstat (red), δδepauli (green) and δδeoi (purple). File Name : figure_s2.eps Caption : selected density deformation channels surface plots, δρi, for interacting fragments: i) [rultrans(nh3)4]2+ – no+ (3, 7 and 11); and ii) [rultrans(nh3)4]+ – no0 (4, 8 and 12). red and blue regions indicate the electronic density outflow and inflow, respectively. choose contour values: *=0.001; ¶=0.002; §=0.005 a.u. File Name : figure_s3.eps Caption : topological map containing the bond paths (continuous or dashed lines connecting the cores) and bond critical points (small green points) for the structures studied in this paper. atoms color: h (white), c (gray), n (blue), o (red) and ru (turquoise).