Figure 3
Main-chain O-atom coordination by the alkali and alkaline-earth metals. The plots were computed considering only mononuclear sites in the <1.5 Å resolution range. All of the resulting average distances are detailed in Supplementary Table S2. The parameters of the box plot are as follows: the box range is from the first to the third quartile, the whiskers extend from the 5th to the 95th percentile and the thick line in the box identifies the median. It is possible that the large size of the boxes for sodium(I) and magnesium(II) may include a relevant contribution from incorrectly modeled water molecules (Nayal & Cera, 1996; Morshed et al., 2015; Gohara & Di Cera, 2016). |