Consider the following list of coordination compounds: (i) [ Co ( NH ₃)₆] Cl ₃ (ii) [ Pt ( NH ₃)₂ Cl ₂] (iii) K ₄[ Fe ( CN )₆] (iv) [ Ni ( CO )₄] (v) [ Co ( NH ₃)₄( H ₂ O )₂] Cl ₃ How many of the given compounds are heteroleptic complexes?

Step-by-step solution

A complex in which the central metal atom or ion is bound to more than one kind of donor groups (ligands) is called a heteroleptic complex. Ligands are the species present inside the coordination sphere (denoted by square brackets). (i) [ Co ( NH ₃)₆] Cl ₃ has only one type of ligand ( NH ₃ ), so it is homoleptic. The Cl ^- ions outside the brackets are counter ions, not ligands. (ii) [ Pt ( NH ₃)₂ Cl ₂] has two types of ligands ( NH ₃ and Cl ^- ), so it is heteroleptic. (iii) K ₄[ Fe ( CN )₆] has only one type of