Azaborane
Azaborane usually refers a borane cluster where BH vertices are replaced by N or NR (R = H, organic substituent). Like many of the related boranes, these clusters are polyhedra and can be classified as "closo-", "nido-", "arachno-", etc. Within the context of Wade's rules, NR is a 4-electron vertex, and N is a 3-electron vertex. Prominent examples are the charge-neutral "nido"-NBH (i.e. (NH)(BH)) and "closo"-NBH (i.e. (NH)(BH)). Azaboranes can also refer to simpler compounds including iminoboranes (formula = RN=NR') and borazines.