Zt. Cai et al., THEORETICAL-STUDIES ON LEWIS-ACIDITY-SCALE AND BONDING CHARACTER OF BORON TRIHALIDES BX3 (X=F, CL, BR, I) BY DV-X-ALPHA QUANTUM-CHEMICAL APPROACH, Chinese journal of chemistry, 15(1), 1997, pp. 17-20
The Lewis acidity scale of boron trihalides BX3 (X=F, Cl, Br, I) and c
haracter of the boron-halogen bonds have been studied by means of DV-X
, approach. Present results show that the acid strength of boron triha
lides increases in the order BF3<BCl3<BBr3<BI3, in excellent agreement
with experiments. Based on boron-halogen bonding character, the valen
ce of boron atom in boron compounds can be considered as equal to five
instead of three which seems to be more reasonable.