ABC26IN1044 · Coordination Chemistry
Subject: Inorganic Chemistry · Chapter: Coordination Chemistry · Topic: Electron Transfer Redox · Exam: NET JUNE 2014 · Marks: 2 · Difficulty: Medium
Consider the second order rate constants for the following outer-sphere electron transfer \[ \begin{array}{l} \left[\mathrm{Fe}(\mathrm{H}_2\mathrm{O})_6\right]^{3+} / \left[\mathrm{Fe}(\mathrm{H}_2\mathrm{O})_6\right]^{2+} \quad 4.0\ \mathrm{M^{-1}\,sec^{-1}} \\ \left[\mathrm{Fe(phen)_3}\right]^{3+} / \left[\mathrm{Fe(phen)_3}\right]^{3+} \quad 3.0\times10^{7}\ \mathrm{M^{-1}} \\ (\text{phen} = 1,10\text{-phenanthroline}) \end{array} \]
The enhanced rate constant for the second reaction is due to the fact that (a)The 'phen' is a $\pi$-acceptor ligand that allows mixing of electron donor and acceptor orbitals that enhances the rate of electron transfer
(b)The phen' is a $\pi$-donor ligand that enhances the rate of electron transfer
(c)The 'phen' forms charge transfer complex with iron and facilitates the eletron transfer
(d)The 'phen' forms kinetically labile complex with iron and facilitates the electron transfer.
Answer
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