Figure 19.
Bond-valence−bond-length plot for O−H bonds. The points plot the valence against the observed bond lengths for a number of accurately determined hydrogen bonds. The thick line is a fit to these points, the thin line is an interpolation of the correlation that would be expected if the repulsion strain between the terminal O2− ions were absent. Reproduced from Figure 7.1 (p.77) from “The Chemical Bond in Inorganic Chemistry. The Bond Valence Model” by Brown, David (2002). By permission of the Oxford University Press.