Question
Give suitable examples for trans-effect in octahedral complexes where CO and substituted phosphines are used as ligands.
Answer :
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The trans-effect is an important concept in coordination chemistry, particularly in octahedral complexes, where certain ligands influence the substitution of ligands positioned trans to them. It refers to the labilization of ligands opposite to a particular ligand during substitution reactions. In octahedral complexes, ligands like CO (carbonyl) and substituted phosphines (PR₃) exhibit a strong trans-effect due to their π-acceptor and σ-donor properties. Carbonyl ligands are strong π-acceptors and can delocalize electron density from the metal through
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