Here are slides used in class, as well as further notes.
Read the short paper where Hawthorne discusses why Boron is his favorite element, and you may also enjoy this paper by Grimes on how Boron Clusters Come of Age.
Further resources: (i) read about BNCT research at the international institute of nano and molecular medicine, (ii) visit the MIT home for BNCT research at the nuclear reactor, (iii) read about the 3D Aromaticity of polyhedral boranes, (iv) an article on Bond Length and Bond Order in polyhedral boranes. Also, study the interactive structures of rhombohedral boron and tetragonal boron and for more information read the corresponding paper.
More interactive structures: B8H8 dianion molecular orbitals, B10H10 dianion molecular structure, and B12H12 dianion molecular structure.
Supplemental exercises for further practice.