Carboncarbon

The term carboncarbon is not widely standardized. In scientific usage, it most often refers to carbon–carbon bonds—the covalent links between two carbon atoms—and to materials whose chemistry is dominated by carbon–carbon bonding.

In chemistry, carbon–carbon bonds arise because carbon has four valence electrons and can form single, double, or triple bonds, leading to a vast array of organic compounds. A typical C–C single bond has a bond dissociation energy around 350 kJ/mol and a length near 1.54 Å; C=C and C≡C bonds are shorter and stronger.

Carbon–carbon materials, including carbon fibers and carbon–carbon composites, are used in aerospace, motorsports, and high-temperature components. They offer high strength-to-weight ratios, stiffness, and thermal conductivity, but experience oxidation in air at high temperatures and require protective coatings or controlled environments. Production often involves carbonization of polymers or graphitization of precursors.

In synthesis, C–C bond formation and cleavage are central; many coupling reactions (such as Suzuki, Heck, and Negishi) provide methods to create carbon–carbon bonds, while radical and organometallic pathways enable diverse transformations.

Overall, carbon–carbon interactions define much of organic chemistry and modern materials science. The shorthand carboncarbon is used in discussions of the bonds themselves and of carbon-based materials.