G. Rasul et Ga. Olah, Calculational study of the protonation of BXH2 and BX2H (X = F and Cl). Structures of BXH3+ and BX2H2+ and their dihydrogen complexes BXH5+ and BX2H4+, INORG CHEM, 40(10), 2001, pp. 2453
Ab initio calculations on monoprotonated BFH2 indicate that the B-H protona
ted la is 9.7 kcal/mol more stable than the F-protonated Ib. Thus the bonde
d electron pair of the B-H bond is a better donor than the nonbonded fluori
ne electron pair in BFH2.