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Ch.21 - Transition Elements and Coordination Chemistry

Chapter 21, Problem 21.138e

In acidic aqueous solution, the complex trans-[Co(en)2Cl1]2+(aq) undergoes the following substitution reaction:

trans-[Co(en)2Cl1]+(aq) + H2O(l) → trans-[Co(en)2(H2O)Cl]2+(aq) + Cl(aq)

The reaction is first order in trans-[Co(en)2Cl2]+(aq), and the rate constant at 25°C is 3.2×10–5 s–1.

e. Draw a crystal field energy-level diagram for ​trans-[Co(en)2Cl2]+ that takes account of the fact that Cl is a weaker-field ligand than ethylenediamine.

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