The reaction of MnCl(2.)4H(2)O with a tetradentate ligand yielded a dinuclear manganese(II) complex of [Mn-2(II)(H2L)(2)Cl-2] (1) (H3L = N-(2-hydroxy-5-nitrobenzyl)iminodiethanol). The magnetic susceptibility measurement revealed that 1 has an S = 5 spin ground state due to an intramolecular ferromagnetic interaction.