The barriers for the oxyl states are small (<10 kcal/mol) and show a slightly increasing trend as we move from the early to the late transition metals.
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Electronic structure of metal oxide dications with ammonia ligands and their reactivity towards the selective conversion of methane to methanol.
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The sentences
On the other hand, the E a values for the remaining states of clear oxyl character are very small (on the order of 10 kcal/mol or smaller) and present an increasing trend.