3-Methyl-1,4-dioxo-1,4-dihydro-naphthalen-2-yl 4-amino-benzoate

Area of Science:

• Crystallography
• Medicinal Chemistry
• Materials Science

Background:

• Aminaftone is a drug utilized in the therapy of venous diseases.
• Understanding the crystal structure of drug molecules is crucial for optimizing their therapeutic efficacy and formulation.
• The oxidized form of aminaftone, C(18)H(13)NO(4), was investigated for its structural characteristics.

Purpose of the Study:

• To determine the crystal structure of the oxidized form of aminaftone.
• To elucidate the intermolecular interactions governing the solid-state arrangement of the compound.
• To provide a structural basis for the drug's activity in venous disease therapy.

Main Methods:

• Single-crystal X-ray diffraction was employed to analyze the crystal structure.
• The arrangement of molecules in the crystal lattice was characterized.
• Intermolecular distances and interactions, including hydrogen bonding and pi-stacking, were quantified.

Main Results:

• The crystal structure is characterized by the formation of molecular ribbons aligned parallel to the [111] crystallographic direction.
• Hydrogen bonding plays a significant role in stabilizing these molecular ribbons.
• Stacking interactions were observed between quinone rings (centroid-centroid distance: 3.684 Å) and amino-benzoate rings (centroid-centroid distance: 4.157 Å) along the ribbons.

Conclusions:

• The determined crystal structure of oxidized aminaftone reveals a unique arrangement of hydrogen-bonded molecular ribbons.
• The observed stacking interactions contribute to the overall stability and packing of the molecules in the solid state.
• This structural information may inform future drug design and development for venous disease treatments.