The indolyl -NH group of the title Schiff base, C(19)H(19)N(3)O(2), forms a hydrogen bond to the -OH group of an inversion-related mol-ecule, resulting in a hydrogen-bonded dimer; adjacent dimers are further linked through an inter-dimer N-H⋯O hydrogen bond involving the -C(=O)-NH-N=fragment to form a linear ribbon that runs along the a axis.
The dinuclear title compound, [Zn(2)(C(19)H(17)N(3)O(2))(2)(H(2)O)(2)]·4C(2)H(6)OS, lies about a center of inversion. The deprotonated monoanion O,N,O-chelates the Zn atom; the hydr-oxy O atom also engages in bonding to the symmetry-related Zn atom so that one N and three O atoms form a square around the metal. The coordination geometry is square-pyramidal, with the apical site occupied by a water mol-ecule. Hydrogen bonds, with the water mol-ecule serving as donor atom, lead to the formation of a linear chain motif. There is an N-H⋯O hydrogen bond between the complex molecule and solvent O atom.