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Lowest energy molecular orbitals containing fluorine electron density (MO 2) for a) 2F-(5-methyl)-imidazole b) 2F-(5-methyl)-imidazolium; c) lowest energy lone-pair like orbital (MO 5) for 4F-(5-methyl)-imidazole d) 4F-(5-methyl)-imidazolium (MO 2).
