Q4(b). Nickel ligand-field parameters
Assign the absorption bands observed at 10750, 17500 and 28200 cm⁻¹ in the electronic spectrum of [Ni(NH₃)₆]²⁺. Calculate ligand field parameters, 10Dq, B′, β, β⁰% and LFSE. Give significance of these parameters. The value of B for free gaseous nickel metal ion is 1060 cm⁻¹.
Answer in brief
10Dq=10750 cm⁻¹; B′≈896.7 cm⁻¹; β=0.8459; reduction β⁰%=15.41%; LFSE =-12900 cm⁻¹.
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All parts of Question 4
- 4(a) Broad asymmetric copper band15 marks
- 4(b) Nickel ligand-field parameters15 marks