Interchange I Mechanism

If [Y] [MLsX], which we can adjust by the experimental conditions, then the following equations will be true, where the naught subscript indicates the total initial reactant concentrations of each species  

In this case, the steady-state approximation given by Equation (17.18) reduces to Equation (17.21) and the overall rate law becomes Equation (17.22)  

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Both solvent exchange reactions show an interchange (I) mechanism (Figs. 25 and 26). Therefore, the quadratic pyramidal ground state with a second solvent molecule in the second... 

It was found that AV for both the acid-independent and acid-catalyzed pathways are approximately zero (109). Thus it was interpreted that Eq. (17) can be considered a substitution reaction of the Cr(III) central cation which proceeds through an interchange, I, mechanism... 

In the above options, (a) involves ligand loss (or dissociation) as the key initiation step, whereas (b) involves ligand gain (or association) as the key initiation step. The third option (c) involves concerted replacement (or interchange) as the key step. As a consequence, they tend to be referred to as dissociative (abbreviated as D), associative (A) and interchange (I) mechanisms in turn. 

The interchange (I) mechanism is offered as a half-way house between the limiting A and D mechanism, involving concomitant entry and departure of the two participating ligands (Figure 5.11). 

An interchange (I) mechanism is a concerted process in which there is no intermediate species with a coordination number different from that of the starting complex. 

In most metal complex substitution pathways, bond formation between the metal and entering group is thought to be concurrent with bond cleavage between the metal and leaving group (equation 25.5). This is the interchange (I) mechanism. 

Draw a diagram showing an interchange (i) mechanism in the following three stages ... 

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