In the title compound, C29H26N2O4, the benzene ring is twisted by 73.5 (5) and 84.9 (3)° with respect to the mean planes of the two indole ring systems; the mean planes of the indole ring systems are oriented at a dihedral angle of 82.0 (5)°. In the crystal, mol­ecules are linked by pairs of N—H⋯O hydrogen bonds into chains.

No abstract

Polyaniline and ruthenium oxide electrodes are prepared to assemble the supercapacitors. The electrochemical properties of the electrodes are studied by cyclic voltammetry and galvanostatic charging/discharging measurements. The potential dependence of specific capacitance for the electrodes in the supercapacitors is established. Based on the relationship between specific capacitance and potential of electrodes, the optimum mass ratio of the electrodes in asymmetric supercapacitor of ruthenium oxide//polyaniline can be accurately determined. The working voltage window for ruthenium oxide//polyaniline supercapacitor is significantly increased by the modulation of mass ratio. Accordingly, the electrical energy density of supercapacitor with a mass ratio of m RuO 2 /m PANI = 0.79 is as high as 7.25 Wh kg −1 , about 314% higher than that of the supercapacitor with a mass ratio of 0.26.

In the title compound, the two indole ring systems are approximately perpendicular to one another, with a dihedral angle between their planes of 84.0 (5)°.

In the title compound, C27H22N2O4, the two indole ring systems are approximately perpendicular to each other, with a dihedral angle of 84.5 (5)° between their planes; the benzene ring is twisted with respect to the two indole ring systems at angles of 78.5 (5) and 86.5 (3)°. In the crystal, mol­ecules are linked by N—H⋯O hydrogen bonds, weak C—H⋯O and C—H⋯N hydrogen bonds, and C—H⋯π inter­actions into a three-dimensional supra­molecular architecture.