We have analyzed the magnetic properties of a Fe(III) tetramesityl porphyrinate with 4-cyanopyridine and imidazol mixed axial iron ligands. In contrast to other S4-ruffled porphyrins, which show the novel (dc)4dxy configuration with axial g-tensor, g{{ z > g{{{ [J. Am. Chem. Soc. 116:7760, 1994], the present compound has a rhombic g-tensor, {{g = (1.22, 2.07, 3.05), which is comparable to those of b- and c-cytochromes.

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