Answer ALL questions in this section. 35 marks) 1. Shown below are the thermodynamic data of five octahedral iron comple

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Answer All Questions In This Section 35 Marks 1 Shown Below Are The Thermodynamic Data Of Five Octahedral Iron Comple 1 (151.42 KiB) Viewed 48 times

Answer ALL questions in this section. 35 marks) 1. Shown below are the thermodynamic data of five octahedral iron complexes at 298 K. All the ligands are charge-neutral. AH/kJmol-1 log B AS/Jmol 'K- -36 _92.7 -50 / [Fe(L1).]2+ [Fe(L2).]2+ [Fe(L3)3]2+ [Fe(L1)6]3+ [Fe(L2).]3+ -66.3 -68.9 -3 / / / 11.2 13.6 / (a) The magnetic moment of [Fe(L1)6]2+ is 4.89 BM. Provide a simplified orbital diagram showing the configuration of d electrons and calculate the crystal field stabilization energy for [Fe(L1)6]2+. (3 marks) (b) Calculate log B for [Fe(L1).]2+, [Fe(L2)6]2+ and [Fe(L3)3]2+. (3 marks) (c) How do you explain the different ß values for [Fe(L2)6]2+ and [Fe(L3)3]2+? (4 marks) (d) The reduction potential of [Fe(H20)6]3+/2+ is +0.77 V (vs. NHE). Calculate the reduction potential of [Fe(L1).]3+/2+ and rationalize your answer. (6 marks) (e) Predict, with explanation, whether the reduction potential of [Fe(L2)6]3+/2+ would be greater or smaller than +0.77 V (vs. NHE) and compare the hard-soft acid- base properties of L1 and 12