Cinnarizinium fumarate

Abstract

In the title salt {systematic name: 4-diphenylmethyl-1-[(E)-3-phenylprop-2- en-1-yl]piperazin-1-ium (2Z)-3-carboxyprop-2-enoate}, C26H 29N2+·C4H3O 4-, the piperazine ring in the cation adopts a distorted chair conformation and contains a positively charged N atom with quaternary character. The dihedral angle between the mean planes of the phenyl rings of the diphenylmethyl group is 74.2(7)° and those between these rings and the phenyl ring of the 3-phenylprop-2-en-1-yl group are 12.7(9) and 80.6(8)°. In the crystal, N - H⋯O and O - H⋯O hydrogen bonds form chains along [001]. Weak C - H⋯O interactions connect parallel chains along [010], forming layers perpendicular to the a-axis direction.