Manganese complexes containing tripodal tetradentate ligands with an N 2 O 2 donor set (H 2 L 1: N, N-bis (2-hydroxybenzyl)-N′, N′-dimethylethylenediamine, H 2 L 2: N-(3, 5-di-t- butyl-2-hydroxybenzyl)-N-(2-hydroxybenzyl)-N′, N′-dimethylethylenediamine, H 2 L 3: N, N-bis (3, 5-di-t-butyl-2-hydroxybenzyl)-N′, N′-dimethylethylenediamine) have been prepared. The mononuclear and trinuclear complexes with the additional carboxylate ...