3-Amino-pyridinium picrate.

Area of Science:

• Crystal Chemistry
• Supramolecular Chemistry

Background:

• Understanding molecular interactions is key in crystal engineering.
• Picric acid and pyridine derivatives are common in chemical studies.

Purpose of the Study:

• To characterize the crystal structure of a novel compound formed from a pyridine derivative and picric acid.
• To investigate the intermolecular forces governing the crystal packing.

Main Methods:

• Single-crystal X-ray diffraction was used to determine the crystal structure.
• Analysis of hydrogen bonding and π-π stacking interactions.

Main Results:

• The compound, C(5)H(7)N(2) (+)·C(6)H(2)N(3)O(7) (-), exhibits a proton transfer from a phenolic group to a pyridine nitrogen atom.
• Intermolecular N-H⋯O and N-H⋯(O,O) hydrogen bonds link ions into layers parallel to the (100) plane.
• Weak π-π stacking interactions between pyridine and picric benzene rings connect these layers, forming a 3D network with a centroid-centroid distance of 3.758(2) Å.

Conclusions:

• The crystal structure reveals a robust 3D network stabilized by a combination of hydrogen bonding and π-π stacking.
• This study provides insights into the supramolecular assembly of organic salts.