Lecture 28 – Elemental Boron Chemistry
5 4. Halides The halides of boron are BX 3 are all volatile, highly reactive, covalently bonded, molecular compounds. BF 3 and BCl 3 are gases at RT. BBr 3 is a liquid and BI 3 is a white solid at RT. They are nonpolar trigonal planar molecules in which the boron atom is sp2 hybridized. To obtain electron density to fill the empty orbital, Group 13 compounds can also form