3,7-Dichloro-quinoline-8-carboxylic acid

Area of Science:

• Agrochemical science
• Crystallography
• Molecular chemistry

Background:

• Quinclorac is a widely used herbicide.
• Understanding its crystal structure is crucial for formulation and efficacy.

Purpose of the Study:

• To elucidate the crystal structure and molecular packing of quinclorac.
• To identify the key intermolecular interactions governing crystal formation.

Main Methods:

• Crystallization of quinclorac from a dimethyl sulfoxide solution.
• Analysis of molecular packing and intermolecular interactions.

Main Results:

• Quinclorac molecules were successfully crystallized.
• The crystal packing is dominated by pi-pi stacking between heterocycles (3.31 Å interplanar distance).
• O-H⋯N hydrogen bonding also contributes significantly to the molecular arrangement.

Conclusions:

• The crystal structure of quinclorac is characterized by specific π-π stacking and hydrogen bonding.
• These interactions dictate the solid-state arrangement and may influence its physical properties and bioavailability.