Globally stabilized bent carbon-carbon triple bond by hydrogen-free inorganic-metallic scaffolding Al 4 F 6 .

For over 100 years, known bent C[triple bond, length as m-dash]C compounds have been limited to those with organic (I) and all-carbon (II) scaffoldings. Here, we computationally report a novel type (III) of bent C[triple bond, length as m-dash]C compound, i.e. , C 2 Al 4 F 6 -01, which is the energetically global minimum isomer and bears an inorganic-metallic scaffolding and unexpected click reactivity.