4,4'-Bipyridine-cyano-acetic acid (1/2)

Area of Science:

• Crystal Engineering
• Supramolecular Chemistry
• Organic Chemistry

Background:

• Supramolecular adducts are formed by self-assembly of molecules through non-covalent interactions.
• Hydrogen bonding and pi-pi stacking are key interactions in constructing supramolecular architectures.
• Cyano-acetic acid and 4,4'-bipyridine are common organic building blocks used in crystal engineering.

Purpose of the Study:

• To synthesize and characterize a novel supramolecular adduct of cyano-acetic acid and 4,4'-bipyridine.
• To investigate the intermolecular interactions governing the crystal structure of the adduct.
• To explore the formation of three-dimensional supramolecular networks through hydrogen bonding and pi-pi stacking.

Main Methods:

• Crystallization from a methanol/water solution at room temperature.
• Single-crystal X-ray diffraction analysis to determine the molecular and crystal structure.
• Analysis of hydrogen bonding (O-H...N, C-H...O, C-H...N) and pi-pi stacking interactions.

Main Results:

• Successful synthesis and crystal structure determination of the C(10)H(8)N(2)·2C(3)H(3)NO(2) adduct.
• Identification of O-H...N hydrogen bonds linking cyano-acetic acid and 4,4'-bipyridine into three-component supramolecular adducts.
• Observation of partial hydrogen atom transfer between cyano-acetic acid and 4,4'-bipyridine.
• Formation of a 3D supramolecular network via additional weak C-H...O, C-H...N hydrogen bonds and pi-pi stacking interactions (3.7200(11) Å).

Conclusions:

• The study successfully elucidated the crystal structure of a novel supramolecular adduct formed by cyano-acetic acid and 4,4'-bipyridine.
• The crystal packing is governed by a combination of strong O-H...N hydrogen bonds, weak C-H...O/N interactions, and pi-pi stacking.
• The findings contribute to the understanding of crystal engineering principles for designing extended supramolecular structures.