Effect of n-methyliminodiacetic acid as a non-bridging ligand in the chromium(II)–chromium(III) electron-transfer reaction

Abstract

The rate of electron transfer between Cr^II and Cr^III ions in solution is enhanced by the presence of the chelate ligand N-methyliminodiacetic acid (H₂L). The rate law can be expressed as d[CrL⁺]/dt=k₁[Cr³⁺][Cr²⁺][HL^–]{H}^2–, where k₁= 0·013 min.^–1 at 25·0° and ionic strength 1·0–1·2 (sodium perchlorate). The rate of the implied bimolecular process CrL + CrOH is discussed in relation to some analogous systems.