Reaction Mechanism of Transition Metal Complexes

Lesson Structure

FIRST PART

1.1 Introduction

1.2 Objectives

1.2 Energy consideration of a reaction

1.3 Reactions of Transition Metal Complexes

1.3.1 Substitution Reactions in Octahedral Complexes

1.3.2 Types of intermediates formed during Unimolecular and Biomolecular Nucleophilic Substitution Reaction

1.4 Stability and lability of coordination compounds

1.4.1 Stepwise formation of complexes

1.4.2 Factor affecting the stability of metal complexes

1.5 Interpretation of lability and inertness of transition metal complexes

1.5.1 Lability and inertness of transition metal complexes and VBT

1.5.2 Lability and inertness of transition metal complexes and CFT

1.6 Mechanistic and Kinetic studies of Substitution Reactions

1.6.1 Kinetics of unimolecular nucleophilic substitution reaction (SN1) or dissociative substitution reaction (D)

1.6.2 Kinetics of bimolecular nucleophilic substitution reaction (SN2) or associative substitution reaction (A)

1.6.3 Kinetics of interchange nucleophilic substitution reaction (I)

1.7 Substitution reactions of octahedral complexes

1.7.1 Acid hydrolysis of octahedral complexes

1.7.2 Factors that influence the rate of acid hydrolysis

1.7.3 Base hydrolysis of octahedral complexes

1.7.4 Factors that favour the SN1 (CB) mechanism

1.8 Anation reactions

1.9 Substitution reaction of octahedral complexes without breaking of metal-ligand bond

1.10 Summary

SECOND PART

2.1 Objectives

2.2 Introduction

2.3 Ligand substitution reactions of square planar complexes

2.3.1 Determination of rate law for nucleophilic substitution reaction of square planar complex

2.3.1a Trans effect

2.3.1b Theories in support to explain the trans effect

2.3.2 Mechanism of nucleophilic substitution reactions in square planar complexes

2.3.3 Factors affecting the rate of ligand substitution reactions in square planar complexes

2.4 Oxidation-reduction (Redox) reactions

2.4.1 The outer sphere mechanism

2.4.2 Salient features of outer sphere mechanism

2.4.3 Marcus-Hush Theory

2.4.3.1 Vibration barrier

2.4.3.2 Solvation barrier

2.4.4 Cross reactions

2.4.5 Inner sphere reactions

2.4.6 The basic requirement for inner sphere mechanism

2.5 Factors affecting the rates of electron transfer reactions

2.6 Summar

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