Consider the complexes [Mn(H₂O)₆]²⁺, [CoF₆]³⁻, [Fe(H₂O)₆]²⁺, [Fe(CN)₆]³⁻, [Cu(H₂O)₆]²⁺ and [Co(CN)₆]⁴⁻. Let x be the number of complexes with four or more unpaired electrons, and y be the number with

Question

Consider the complexes [Mn(H₂O)₆]²⁺, [CoF₆]³⁻, [Fe(H₂O)₆]²⁺, [Fe(CN)₆]³⁻, [Cu(H₂O)₆]²⁺ and [Co(CN)₆]⁴⁻. Let x be the number of complexes with four or more unpaired electrons, and y be the number with an odd number of electrons in e g ​ and an even number in t 2 g ​ . Use crystal field theory with aqua and fluoride as weak-field and cyanide as strong-field. Find x + y.

TestHub · Accepted Answer

Unpaired electrons: Mn²⁺ 5, CoF₆³⁻ 4, Fe²⁺(aq) 4, Fe(CN)₆³⁻ 1, Cu²⁺ 1, Co(CN)₆⁴⁻ 1, so x = 3. Odd e g ​ with even t 2 g ​ : Cu²⁺ is t 2 g ​ ⁶ e g ​ ³ and Co(CN)₆⁴⁻ is t 2 g ​ ⁶ e g ​ ¹, so y = 2. x + y = 5.

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