A new pentanuclear bis(triple-helical) manganese complex has been isolated and characterized by X-ray diffraction in two oxidation states: [{Mn^II(μ-bpp)₃}₂Mn^II₂Mn^III(μ-O)]³⁺ (1³⁺) and [{Mn^II(μ-bpp)₃}₂Mn^IIMn^III₂(μ-O)]⁴⁺ (1⁴⁺). The structure consists of a central {Mn₃(μ₃-O)} core of Mn^II₂Mn^III (1³⁺) or Mn^IIMn^III₂ ions (1⁴⁺) which is connected to two apical MnII ions through six bpp- ligands. Both cations have a triple-stranded helicate configuration, and a pair of enantiomers is present in each crystal. The redox properties of 1³⁺ have been investigated in CH₃CN. A series of five distinct and reversible one-electron waves is observed in the -1.0 and +1.50 V potential range, assigned to the Mn^II₄Mn^III/Mn^II₅, Mn^II₃Mn^III₂/Mn^II₄Mn^III, Mn^II₂Mn^III₃/Mn^II₃Mn^III₂, Mn^IIMn^III₄/Mn^II₂Mn^III₃, and Mn^III₅/Mn^IIMn^III₄ redox couples. The two first oxidation processes leading to Mn^II₃Mn^III₂ (1⁴⁺) and Mn^II₂Mn^III₃ (1⁵⁺) are related to the oxidation of the Mn^II ions of the central core and the two higher oxidation waves, close in potential, are thus assigned to the oxidation of the two apical Mn^II ions. The 1⁴⁺ and 1⁵⁺ oxidized species and the reduced Mn₄^II (1²⁺) species are quantitatively generated by bulk electrolyses demonstrating the high stability of the pentanuclear structure in four oxidation states (1²⁺ to 1⁵⁺). The spectroscopic characteristics (X-band electron paramagnetic resonance, EPR, and UV-visible) of these species are also described as well as the magnetic properties of 1³⁺ and 1⁴⁺ in solid state. The powder X- and Q-band EPR signature of 1³⁺ corresponds to an S = 5/2 spin state characterized by a small zero-field splitting parameter (|D| = 0.071 cm^-1) attributed to the two apical Mn^II ions. At 40 K, the magnetic behavior is consistent for 1³⁺ with two apical S = 5/2 {Mn^II(bpp)₃}^– and one S = 2 noninteracting spins (11.75 cm³ K mol^-1), and for 1⁴⁺ with three S = 5/2 noninteracting spins (13.125 cm³ K mol^-1) suggesting that the {Mn^II₂Mn^III(μ₃-O)}⁵⁺ and {Mn^IIMn^III₂(μ₃-O)}⁶⁺ cores behave at low temperature like S = 2 and S = 5/2 spin centers, respectively. The thermal behavior below 40 K highlights the presence of intracomplex magnetic interactions between the two apical spins and the central core, which is antiferromagnetic for 1³⁺ leading to an ST = 3 and ferromagnetic for 1⁴⁺ giving thus an ST = 15/2 ground state.