Bond valence as an aid to understanding the stereochemistry of O and F complexes of Sn(II), Sb(III), Te(IV), I(V) and Xe(VI)

The calculation of bond valences (S) from the bond lengths (R) observed in 63 different crystals using the relation s = so(R/Ro−N allows a direct quantitative comparison of the bonding in a variety of different complexes formed between A and X atoms where A = Sn(II), Sb(III), Te(IV), I(V) and Xe(VI) and X = 0 and F. The environment of A is usually an octahedron which has been distorted so that the weak bonds occur opposite strong bonds and …