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Electron Paramagnetic Resonance of Manganese (II) in Newly Humified Clover Leaves¹

ABSTRACT

Clover leaves (Trifolium alexandrium L.) were humified by incubation at 30°C for 60 d. Electron paramagnetic resonance (EPR) and infrared (IR) spectra were recorded during that time. The EPR spectra of the leaves exhibited a hyperfine structure characteristic of Mn(II). The theory of the EPR experiment was discussed and the parameters of the spin Hamiltonian were determined. The A and D values of –265 and 150 Mc s^–1 respectively, indicated that Mn(II) was coordinated by six oxygen-containing functional group ligands in an appreciably distorted octahedron environment.

¹ Contribution of the Laboratoire de Physico-Chimie Industrielle, Ecole Nationale Supérieure des Industries Chimiques Nancy, France.

² Professor of Soil Science and Professor of Physical Chemistry, respectively. The permanent address of the senior author is Faculty of Agric., The Univ., Mansoura, Egypt.

Received for publication February 11, 1983. Accepted for publication February 12, 1985.