Crystal structure of anagyrine perchlorate
The title molecular salt, C15H21N2O+·ClO4−, crystallizes with four cations (A,B,CandD) and four anions in the chiral unit cell (space groupP21). The alkaloid was isolated from the aerial parts ofGenista Hispanicacollected in the Samarkand region of Uzbekistan. Each cation is protonated at the N atom that bridges the alkaloid ringsCandD. In each cation, ringAis almost planar and ringBadops a sofa conformation with the methylene group bridging to theCring as the flap. RingsCandDadopt chair conformations with acisring junction in all four cations. In the crystal,A+BandC+Ddimeric pairs linked by pairs of N—H...O hydrogen bonds are observed, which generateR22(16) loops in each case. The dimers are consolidated by weak aromatic π–π stacking interactions between theArings [centroid–centroid distances = 3.913 (3) and 3.915 (3) Å].