Some chalcones derived from thio-phene-3-carbaldehyde: synthesis and crystal structures

Area of Science:

• Organic Chemistry
• Crystallography
• Materials Science

Background:

• Chalcones are versatile organic compounds with diverse biological activities.
• Thiophene derivatives are important heterocyclic compounds with applications in pharmaceuticals and materials science.
• Understanding structure-property relationships is crucial for designing novel functional molecules.

Purpose of the Study:

• To synthesize and characterize four novel 3-(3-phenyl-prop-1-ene-3-one-1-yl)thiophene derivatives.
• To investigate the influence of para-substituents on the crystal and molecular structures of these chalcones.
• To analyze the intermolecular interactions and packing motifs in the solid state.

Main Methods:

• Synthesis of four thiophene chalcones via Claisen-Schmidt condensation.
• Single-crystal X-ray diffraction for structural determination.
• Spectroscopic analysis (NMR, IR, Mass Spectrometry) for compound characterization.
• Hirshfeld surface analysis to quantify intermolecular interactions.

Main Results:

• Four thiophene chalcone derivatives with hydroxyl, methoxy, ethoxy, and bromo substituents were successfully synthesized.
• Crystal structures revealed varying degrees of planarity, with the bromo derivative showing significant deviation.
• Intermolecular interactions, including O-H···O, C-H···O, C-H···π, and C-H···S contacts, dictate the molecular packing.
• Hirshfeld surface analysis confirmed the dominance of hydrogen-involved interactions.

Conclusions:

• The para-substituent on the phenyl ring influences the molecular conformation and crystal packing of thiophene chalcones.
• Intermolecular interactions are critical in defining the solid-state architecture of these compounds.
• The synthesized chalcones serve as a foundation for further exploration of their chemical and physical properties.