4-(4-Pyridylamino)pyridinium perchlorate

Area of Science:

• Crystallography
• Supramolecular Chemistry
• Materials Science

Background:

• Understanding the self-assembly of organic molecules is crucial for designing new materials.
• Hydrogen bonding and C-H···π interactions are key non-covalent forces driving molecular organization.

Purpose of the Study:

• To elucidate the crystal structure and intermolecular interactions of the 4-(4-pyridylamino)-pyridinium perchlorate salt.
• To investigate the role of hydrogen bonding and C-H···π interactions in the formation of extended structures.

Main Methods:

• Single-crystal X-ray diffraction was employed to determine the three-dimensional crystal structure.
• Analysis of intermolecular distances and angles was performed to identify and quantify hydrogen bonding and C-H···π interactions.

Main Results:

• The 4-(4-pyridylamino)-pyridinium cations form 1D chains through N-H···N hydrogen bonds.
• These chains are further organized into 2D layers via C-H···π interactions.
• Perchlorate anions are integrated into the layered structure through N-H···O hydrogen bonds.
• The perchlorate anion displays positional disorder around a Cl-O axis.

Conclusions:

• The crystal structure demonstrates a hierarchical assembly driven by a combination of hydrogen bonding and C-H···π interactions.
• The observed disorder of the perchlorate anion provides insights into the dynamic behavior within the crystal lattice.
• This study contributes to the understanding of structure-property relationships in pyridinium salts.