Question

The reaction given in equation 1 occurs via an associative mechanism that involves nucleophilic attack of Yon [ML,X] . Draw out and label the reaction profile for this reaction pathway. [ML,X]2+ + Y- → [ML,Y]2+ + X (eq 1) Sketch the reaction profile diagram for an inner-sphere electron transfer, assuming that the rate-determining step is the electron transfer step. Label each part of the profile (intermediates, energies). (ii) How does the mechanism for an inner-sphere mechanism differ from an outer-sphere mechanism? (iii) Write out the steps for an inner-sphere electron transfer mechanism involving the two complexes with general formula ML. and M L X. Describe the individual steps in words.

Answer 1

PARALL Answer:- In the associative pathway, the incoming ligand (Y) binds the metal ion of the reacting species without releasing the leaving group, forming an intermediate with higher co-ordination number. This step is the rate dexenning determining step. After that the leaving group (+-) is released out from the intermediate to give the product. ... [ML x 2 + + y (x... Mer] [MLmy]2+ + x® The reaction profile gram Poto [X-N energy [ML nx] 2+ [ML RY]2+, x reaction co-ordinate

Answer: - The reaction profile diagram of a inner sphere transfer, where the 1st step is rodos electron as T.S-1 Tos-2 Poti - energ reactant Product reaction co-ordinate where, & E = activation energy I = intermediate and d. 4H = chang of enthalpy

•Answer: - The differences between inner sphere mechanism sphere mechanism is- and cuter. The inner sphere mechanism of electron transfer ix a redox chemical reaction that occurs via a co-valent linkage between oxidant and reductant reactant of the reaction .... Where as, the outer sphere e mechanism of electron men transfer is a chemical reactant in which reactants and products exist seperate from each other before, during and after the event of electron transfer. The inner sphere electron transfer occurs via the formation of linkage between redox centers through bridging ligands. ... For the outer sphere electron transfer, no linkage formation occurs, the reactants remains seperate before, during and after the reaction.

Answer - The inner sphere electron transfer reaction between ML and Mis occurs via formation of a inner sphere. complex. ML + MLsx -- [LSM-x-M 5] + L Then the electron tromster occurs from the lower oxidation state metal 70 higher oxidation state metal via bridging ligand. TLM-X - MLs) e-transfer [LM-x-Mils] MCo) - X-M (1) M(1) - X-MCO) Complex complex Finally, the ligand approaches, and breaks the inner sphere complex, & forming two seperate. complex species. [[SM-x- Mls] - MLsx + Mile