The table below shows rate constants of ligand substitution reactions with various entering ligands for [Cr(NH3)5(HO)]+...

 

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The table below shows rate constants of ligand substitution reactions with various entering ligands for [Cr(NH3)5(H₂O)]²+ and [Cr(H₂O)]²+. Rate Constants for Anation Entering Ligand NCS NO3 CIT Br I™ [Cr(NH3)5(H₂O)]³+ k(10-4 M-¹ S-¹) 4.2 - 0.7 3.7 [Cr(H₂O)]³+ k(10-8 M-¹ S-¹) 180 73 2.9 0.9 0.08 CF3COO 1.4 Data from D. Thusius, Inorg. Chem., 1971, 10, 1106; T. Ramasami, A. G. Sykes, Chem. Commun., 1978, 378. a. Describe trends of rate constants for [Cr(NH3)5(H₂O)]³+ and [Cr(H₂O)6]³+. b. Propose substitution mechanisms for [Cr(NH3)5(H₂O)]³+ and [Cr(H₂O)]³+. c. Try to rationalize why two complexes undergo ligand substitution reactions via different mechanisms. The table below shows rate constants of ligand substitution reactions with various entering ligands for [Cr(NH3)5(H₂O)]²+ and [Cr(H₂O)]²+. Rate Constants for Anation Entering Ligand NCS NO3 CIT Br I™ [Cr(NH3)5(H₂O)]³+ k(10-4 M-¹ S-¹) 4.2 - 0.7 3.7 [Cr(H₂O)]³+ k(10-8 M-¹ S-¹) 180 73 2.9 0.9 0.08 CF3COO 1.4 Data from D. Thusius, Inorg. Chem., 1971, 10, 1106; T. Ramasami, A. G. Sykes, Chem. Commun., 1978, 378. a. Describe trends of rate constants for [Cr(NH3)5(H₂O)]³+ and [Cr(H₂O)6]³+. b. Propose substitution mechanisms for [Cr(NH3)5(H₂O)]³+ and [Cr(H₂O)]³+. c. Try to rationalize why two complexes undergo ligand substitution reactions via different mechanisms.