Low oxidation states of metals in their compl | vedclass

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(A) In complexes where the metal is in a low oxidation state,the metal center is electron-rich. To stabilize this state,the ligands must be able to ac

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have good $\pi$-accepting character

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(A) In complexes where the metal is in a low oxidation state,the metal center is electron-rich. To stabilize this state,the ligands must be able to accept electron density from the metal through back-bonding. Therefore,ligands with good $\pi$-accepting character (such as $CO$,$NO^+$,$CN^-$) are required to form stable complexes with metals in low oxidation states.

Low oxidation states of metals in their complexes are common when ligands:

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