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Exploring Factors Affecting the Reactivity of Transition Metal Complexes: Case Studies on the Reactions of CrCl3 and [Cr(OH2)6]2+ with Co(en)2I2 and [Co(NH3

The reaction of CrCl3 with liquid NH3 to give yellow [Cr(NH3)6]Cl3 often has a low yield,
since the reaction tends to stop with the production of pink [Cr(NH3)5Cl]Cl2. However,
adding a small piece of Na metal to the liquid NH3 results in complete conversion of the
CrCl3 to [Cr(NH3)6]Cl3. Offer two plausible explanations of this rate enhancement for the
final step of the substitution process
2- Write a hypothetical inner-sphere redox mechanism for the reaction of [Cr(OH2)6]2+ with cis-
[Co(en)2I2]+ in acid solution to give (ultimately) cis-[Cr(OH2)4I2]+, Co2+
(aq) and en. What
evidence could support this mechanism and why?
3-Consider reduction of the following cobalt complexes [Co(NH3)5(L)]3+ (L = pyridine (I),
NC5H4-p-CH2NH2 (II), NC5H4-p-CONH2 (III)) by labile [Cr(OH2)6]2+
.
a). Which cobalt complex is least likely to be reduced by an inner-sphere mechanism?
b). The reduction of III proceeds with a rate constant of k = 17.4, while the reduction of I
proceeds with a rate constant of k = 4.0 × 10-3
. What is a likely explanation of the difference?
Requirements: 1page

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