Organic multi-stage redox systems are key component in many technological fields ranging from organic electronic (solar cells, batteries…) to spintronic. Among the strategies used to design such compounds, one approach consists in linking two cationic heteroatoms through a -conjugated backbone featuring an even number of sp 2 C-atoms (Scheme 1). This led to the preparation of "Weitz type" derivatives which display three redox states including a stable radical cation intermediate. Methyl-Viologens (MV) are probably the most emblematic electron acceptors of this family. Although Hünig et al. mentioned in 1978 the applicability of this general strategy to systems in which phosphorus is the unique heteroatom, 3 such derivatives have not been described yet to the best of our knowledge, despite the wide literature on organophosphorus based -systems and switches. Due to the specificities of P compared to the others heteroatoms in terms of electronegativity, valence, coordinence, it appeared interesting to us to study the impact of its insertion on the optical/redox properties. 9 Scheme 1. General structure of multi-stage redox systems