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The dication C2H has been investigated by ab initio molecular orbital theory. It is found to have a linear (D∞h), structure with a triplet (3σ−g) ground state. Deprotonation to C2H+ is exothermic by 9.8 kcal/mol, but this process is hindered by a large barrier of 65 kcal/mol.
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Pople et al. (1982) studied this question.
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