The cationic species
H2C·+ or substitution derivatives thereof, formally derived by adding a hydron to a carbyne or subtracting an electron from a carbene.
Source:
PAC, 1996, 68, 1321. 'A new approach to enhancing the efficiency and specificity of interaction in duplexes by the use of tandem structure' on page 1326 (https://doi.org/10.1351/pac199668061321)