11. The iron(III) complex of tetraphenylporphyrin, Fe(TPP)Cl, and its reaction w
ID: 1036291 • Letter: 1
Question
11. The iron(III) complex of tetraphenylporphyrin, Fe(TPP)Cl, and its reaction with 2-methyl imidazole, 2-Melm, are shown below: CI 2-Melm HN Fe(TPP)C Fe(TPPIC (side view) (side viewj) Cyclic voltammetric results reveal two reversible waves when Fe(TPP)CI is reduced at a glassy carbon electrode in dimethylformamide solvent containing tetraethylammonium perchlorate electrolyte. Reduction waves are observed at -0.18 (FeFe2*) and -1.02 V (Fe2+ ? Fe+) versus Ag|AgCl. when a 10 mM concentration of 3-Melm is added to 1 mM Fe(TPP)Cl, the waves shift to -0.14 and -1.11 V. On the basis of these shifts, which oxidation state is most stabilized by the ligand. Explain your answer.Explanation / Answer
Given, reaction occurs between Iron (III) complex of tetraphenylporphyrin Fe(TPP)Cl and 2-methyl imidazole.
More is the reduction potential, more is the tendency of the catalyst to undergo reduction. Since, the reduction potential of Fe3+ --> Fe2+ is reduced from -0.18 to -0.14, so it can be told that the reduction of Fe3+ --> Fe2+ becomes less facile. Thus, it can be regarded that the Fe3+ oxidation state is more stabilized by the ligand.
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