Bis(2-amino-3-nitro-pyridinium) dichromate(VI)

Area of Science:

• Crystal chemistry
• Coordination chemistry
• Materials science

Background:

• Understanding the supramolecular assembly of organic-inorganic hybrid compounds is crucial for designing new materials.
• Pyridinium salts and dichromate anions offer diverse coordination possibilities.
• Hydrogen bonding plays a significant role in stabilizing crystal structures.

Purpose of the Study:

• To elucidate the crystal structure and intermolecular interactions of the title compound, (C(5)H(6)N(3)O(2))(2)[Cr(2)O(7)].
• To investigate the role of hydrogen bonding in the formation of a three-dimensional framework.

Main Methods:

• Single-crystal X-ray diffraction analysis was employed to determine the crystal structure.
• Analysis of hydrogen bonding (N-H⋯O, C-H⋯O) and other intermolecular forces (electrostatic, van der Waals) was performed.

Main Results:

• The compound crystallizes with 2-amino-3-nitro-pyridinium cations and discrete dichromate anions.
• A layered structure parallel to (101) was observed, stabilized by N-H⋯O and C-H⋯O hydrogen bonds.
• Layer cohesion and a three-dimensional framework are formed through hydrogen bonding and electrostatic interactions.

Conclusions:

• The crystal structure confirms the formation of a robust 3D framework from organic cations and inorganic anions.
• Hydrogen bonding is a key determinant in the supramolecular architecture of this compound.
• The dichromate anion resides on a twofold axis, indicating specific coordination geometry.