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 : 526
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The Effective Atomic Number (EAN) is a useful concept for understanding the stability and electron count of coordination and organometallic complexes. It represents the total number of electrons associated with the central metal atom after considering its own electrons and the electrons donated by the ligands. The EAN of a complex can be calculated by adding the atomic number of the metal to the electrons gained through oxidation-state adjustment and ligand donation. For the complex Mn(CO)₄NO, the central metal is manganese (Mn), whose atomic number is 25. The complex contains four carbon monoxide (CO) ligands and one nitrosyl (NO) ligand. The important point in this calculation is the manner in which the NO ligand is treated. CO is a neutral two-electron donor ligand. It donates one lone pair of electrons from carbon to the metal through a coordinate bond. Therefore, four CO ligands donate a total of 8 electrons. NO is an unusual ligand because it can bond to a metal in different ways. In metal nitrosyl complexes, NO is commonly treated as NO⁺ when it is linearly bonded to the metal. The NO⁺ ion is isoelectronic with CO and N₂. CO has 10 total valence electrons: carbon contributes 4 and oxygen contributes 6. N₂ also has 10 valence electrons
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