The topic of dicarbon, C2, has been discussed here for a few years now. It undoubtedly would be a gas! This aspect of the species came to the fore recently[cite]10.1039/D2CP01214F[/cite] when further experiments on a potential chemical precursor of dicarbon, the zwitterion X(+)-C≡C(-), showed that different variants of X(+), such as not only X=PhI(+), but also e.g. X=dibenzothiophenium(+) appeared to generate a gaseous species, which could be trapped as “C2” in a solvent-free connected flask experiment.