A new hydrogen-bonded polymeric Mn(III) complex C 19 H 20 Mn 1 N 3 O 3 S 1 (1) has been synthesised by conventional procedure with a new Schiff base ligand (2Z,3Z)-N 1 ,N 2 -bis(1-(2-hydroxyphenyl)ethylidene)ethane-1,2-diamine (H 2 L) bearing a tetradentate N 2 O 2 donor site. The complex has been characterised with several spectroscopic techniques like FT-IR, UV/Vis and EPR and also well supported by variable temperature magnetic susceptibility study. The structure of the co-ordination complex has been unequivocally confirmed from single crystal X-ray diffraction study. The redox stability of the metal chelate complex has been investigated with a slow scan cyclic voltammetry.