Syntheses of BC3N and BC7N by Condensation of Polyacrylonitrile-Based Polymer with BC13

Thermal decomposition of poly(acrylonitrile) results in the formation of graphite [so-called peroxyacetyl nitrate (PAN)-based graphite] by elimination of hydrogen and nitrogen. In reaction (8), however, condensation reaction occurred without elimination of nitrogen. This is probably because the boron atom can strongly bind with nitrogen atom in the BQN structure. This result implys that boron is an appropriate chemical species for bridging linear carbon-and nitrogen-containing polymer chains.