Structure (neutron) of 4,9-dihydro-7-methoxy-1-methyl-3H-pyrido[3,4-b]indole (harmaline), C13H14N2O

Bis(6-meth-oxy-1-methyl-2,3,4,9-tetra-hydro-1H-β-carbolin-2-ium) tetra-chloridozincate(II) dihydrate

The asymmetric unit of the title compound, (C(13)H(17)N(2)O)(2)[ZnCl(4)]·2H(2)O, contains two tetra-hydro-harmine cations, one tetra-chloro-zincate(II) anion and two water mol-ecules. In the cations, the two 1H-indole ring systems are essentially planar, with maximum deviations of 0.016 (2) and 0.018 (2) Å, and both tetra-hydro-pyridinium rings show a half-chair conformation. The Zn(II) complex anion has a distorted tetra-hedral geometry. In the crystal, inter-molecular N-H⋯O, N-H⋯Cl, O-H⋯O, O-H⋯Cl and C-H⋯O hydrogen bonds link the components into a three-dimensional network. A π-π inter-action with a centroid-centroid distance of 3.542 (14) Å is also observed.

Bis(7-methoxy-1-methyl-4,9-dihydro-3H-β-carbolinium) tetrachloridozincate

In the title compound, (C₁₃H₁₅N₂O)₂[ZnCl₄], also known as di(harmalinium) tetra­chloridozincate, the Zn^II atom is in a distorted tetrahedral coordination of the chlorido ligands. In the cation, the meth­oxy and methyl groups are both coplanar with with rings to which they are attached [maximum deviations of 0.232 (4) and 0.259 (4) Å, respectively]. In the crystal, the alkaloid cations and metal complex anions inter­act by way of N—H⋯Cl hydrogen bonds involving each Cl atom, resulting in a network structure.