Abstract
A b initio SCF computations are presented for the ground states of HC2 and HC2−. The results indicate that the bonding situation in HC2 and HC2− is similar to CN and CN−, respectively. Qualitatively speaking, the negative ion is formed by addition of the extra electron to the half filled 5σ molecular orbital of HC2 to form a lone pair of electrons. A large positive electron affinity is expected for HC2 on the basis that the 5σ molecular orbital contains an appreciable amount of s character similar to that found for the CN radical. The SCF computed electron affinity is 1.94 eV. The experimental electron affinity is estimated to be 2.5 eV.
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