Orphenadrinium picrate picric acid.

Area of Science:

• Crystallography
• Supramolecular Chemistry
• Chemical Physics

Background:

• Orphenadrine is a medication with anticholinergic properties.
• Picric acid is a strong acid and a component in explosives.
• Understanding the solid-state interactions of pharmaceutical compounds is crucial for drug development.

Purpose of the Study:

• To elucidate the crystal structure of the N,N-dimethyl-2-[(2-methyl-phen-yl)phenyl-meth-oxy]ethanaminium picrate picric acid co-crystal.
• To analyze the intermolecular interactions governing the crystal packing.

Main Methods:

• Single-crystal X-ray diffraction was employed to determine the molecular and crystal structure.
• Analysis of hydrogen bonding and π–π interactions was performed.

Main Results:

• The asymmetric unit contains one orphenadrine cation, one picrate anion, and one picric acid molecule.
• Intramolecular hydrogen bonding was observed in the picric acid molecule (S(6) ring).
• A three-dimensional network is formed through intermolecular N-H⋯O, π–π interactions (3.5603 Å), and C-H⋯O hydrogen bonds.

Conclusions:

• The crystal structure reveals a complex network stabilized by multiple non-covalent interactions.
• This detailed structural information provides insights into the solid-state behavior of orphenadrine in the presence of picric acid.