(E)-1,1′-Dibutyl-3,3′-biindolinylidene-2,2′-dione

Abstract

In the title molecule, C24H26N2O2, the two indol-2-one units, which are connected by a C=C double bond, are almost coplanar with an interplanar angle of 6.8 (1)°. On cooling from 293 to 120 K, the space group changes from P21/n to P21. Two intramolecular C—H...O hydrogen bonds occur.