3-(1-Methyl­pyrrolidin-2-yl­idene)-3H-indole sesquihydrate

The asymmetric unit of the title compound, C(13)H(14)N(2)·1.5H(2)O, contains two similar mol­ecules of 3-(1-methyl­pyrrolidin-2-yl­idene)-3H-indole, (I), and three water mol­ecules. (I) is the product of reacting indole with 1-methyl­pyrrolidin-2-one in the presence of phospho­rus oxychloride. Both organic molecules are almost completely planar; the maximum distances above and below the least-squares plane through all the atoms of mol­ecule 1 are 0.050 (8) and −0.045 (8) Å, respectively, and the deviations for mol­ecule 2 are 0.096 (8) and −0.059 (8) Å, respectively. In the crystal, the two crystallographically different mol­ecules alternate in π-stacked columns [centroid–centroid distances = 3.729 (5) and 3.858 (5) Å], which are linked by O—H⋯N hydrogen bonds to a network of hydrogen-bonded water mol­ecules. O—H⋯O inter­actions are also present.