Zwitterionic form of tris­({[5-(4-meth­oxy­phenyl­azo)salicyl­idene]amino}­eth­yl)amine

The title compound (systematic name: 2-{[2-(bis­{2-[({2-hy­droxy-5-[(4-meth­oxy­phen­yl)diazen­yl]phen­yl}methyl­idene)amino]­eth­yl}amino)­eth­yl]aza­niumylidenemeth­yl}-4-[(4-meth­oxy­phen­yl)diazen­yl]phenolate), C(48)H(48)N(10)O(6), exists as a zwitterion in the solid state. The three arms of the tripodal mol­ecule are located close to each other and an intra­molecular hydrogen bond occurs in each arm (O—H⋯N in two arms and N—H⋯O in the zwitterionic arm). The dihedral angles between the aromatic rings in the three arms are 16.36 (14), 23.94 (14) and, for the zwitterionic arm, 37.14 (14)°. In the crystal, a weak inter­moleclar N—H⋯O hydrogen bond occurs.