FIGURE 7 is near here
Figure 7 shows the bond lengths of halogen bonds (e.g. I…I,
I…O, I…C(π) in Table 3) and their relationship with
electron densities ρ (b). For the halogen bonds, the lower the
electron density, the longer the bond length. Therefore, the electron
density might serve as a rough measure to estimate the strength of
halogen bonding interactions.