The hexadentate ligand 1,4,7-tris(3-tert-butyl-5-methoxy-2-hydroxybenzyl)-1,4,7-triazacyclononane, H3L, forms a very stable neutral complex [CrIIIL]·2MeCN 2 with chromium(III) which undergoes electrochemically three one-electron oxidations to yield [CrIIIL]+, [CrIIIL]2+ and [CrIIIL]3+, respectively; these contain one, two and three coordinated phenoxyl radical ligands; [CrIIIL]·2MeCN and [CrIIIL]ClO4·3MeCN are characterized by X-ray crystallography.
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Sokolowski et al. (1996) studied this question.
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