Question
Calculate the Effective Atomic Number (EAN) of the Mn(CO)4NO complex. Here how is the
ligand NO treated as? In this was how the ligand NO becomes analogous to CO and N2?
Answer :
Word Count : 301
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Manganese in the complex Mn(CO)₄NO is assigned the oxidation state zero because carbon monoxide is a neutral ligand and, in this formulation, the nitrosyl ligand is treated as a neutral ligand. The electronic configuration of free manganese is [Ar] 3d⁵4s², giving it 25 electrons. Since the oxidation state is zero, the metal contributes all 25 electrons. Each CO ligand is a neutral two-electron donor through the carbon atom. Four CO ligands therefore contribute 4 × 2 = 8 electrons. The nitrosyl ligand, when treated as a linear neutral NO ligand, also acts as a two-electron donor. Thus, NO contributes 2 electrons in the same manner as CO. The Effective Atomic Number (EAN) is calculated as: EAN =
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