Carbide iodide

Carbide iodides are mixed anion compounds containing iodide and carbide anions. Many carbide iodides are cluster compounds, containing one, two or more carbon atoms in a core, surrounded by a layer of metal atoms, and encased in a shell of iodide ions. These ions may be shared between clusters to form chains, double chains or layers.

The metal in carbide iodides is most often a rare earth element. Similar formulas tend to have similar structures. Where R is a rare earth element: R₁₂C₆I₁₇ contains chains of R₆ octahedra with a C₂^{6−} core and a shell of iodide. R₄I₅C contains similar chains, but with a single C₄^− carbide atom. Double chain structures with single carbon atom cores include R₆I₇C₂ and R₃I₃C. Layers of joined octahedra include R₂I₂C₂ with an ethanide C₂^{4−} core; R₂I₂C and R₂IC with one carbide per octahedron.

Related compounds include carbide chlorides, and carbide bromides. Carbon may be substituted by hydrogen, boron or nitrogen in the core of cluster compounds.

This list does not include cyanides, carbonyls, cyanamides or carbido borates, where carbon has bonds to other non-metals. However, there are carbide iodides that also contain nitride, oxide or other halides.

List

Do not confuse Cl for chlorine, and CI for carbon and iodine.

References