The extended variant of the bond valence–bond length correlation curve for boron(III)–oxygen bonds

Abstract

Abstract The extended variant of the bond valence (s)–bond length (r) correlation curve for boron(III)–oxygen bonds has been closely approximated using the three-parameter function s = [k/(r – l)] – m, where s is measured in valence units (vu), r is measured in Å, k = 0.53 Å·vu, l = 0.975(1) Å and m = 0.32 vu. The function s = exp[(r 0 – r)/b] traditionally used in the modern bond valence model requires the separate set of the bond valence parameters (r 0 = 1.362 Å; b = 0.23 Å) in order to approximate the above s–r curve for the bonds shorter than ∼1.3 Å.