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Azaborane
Azaborane usually refers a boranes, borane Cluster chemistry, cluster where Boron, BH vertices are replaced by Nitrogen, N or NR (R stands typically for hydrogen, H or Organic compound, organic substituent). Like many of the related boranes, these clusters are polyhedra and can be classified as Boranes#Chemical formula and naming conventions, ''closo-'', ''nido-'', ''arachno-'', etc. Within the context of Polyhedral skeletal electron pair theory, Wade's rules, NR is a 4-electron vertex, and N is a 3-electron vertex. Prominent examples are the charge-neutral ''nido''- (i.e. ) and ''closo''- (i.e. ).{{cite journal, author=P. Paetzold, title=New Perspectives in Boron-Nitrogen Chemistry-I, year=1991, pages=345–350, volume=63, journal=Pure Appl. Chem., issue=3, doi=10.1351/pac199163030345, s2cid=53659373, url=https://www.iupac.org/publications/pac/pdf/1991/pdf/6303x0345.pdf Azaboranes can also refer to simpler compounds including iminoboranes (RB=NR', where R and R' stand typically ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carborane
Carboranes (or carbaboranes) are electron-delocalized (non-classically bonded) clusters composed of boron, carbon and hydrogen atoms.Grimes, R. N., ''Carboranes 3rd Ed.'', Elsevier, Amsterdam and New York (2016), . Like many of the related boron hydrides, these clusters are Polyhedron, polyhedra or fragments of polyhedra. Carboranes are one class of heteroboranes. In terms of scope, carboranes can have as few as 5 and as many as 14 atoms in the cage framework. The majority have two cage carbon atoms. The corresponding carbon, C-alkyl and boron, B-alkyl analogues are also known in a few cases. Structure and bonding Carboranes and boranes adopt 3-dimensional cage (Cluster chemistry, cluster) geometries in sharp contrast to typical organic compounds. Cages are compatible with sigma—delocalized bonding, whereas hydrocarbons are typically chains or rings. Like for other electron-delocalized polyhedral clusters, the electronic structure of these cluster compounds can be described by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
