2,4,6-Trichlorophenylisonitrile and 2,4,6-trichlorobenzonitrile

Area of Science:

• Crystallography
• Molecular Structure Analysis
• Supramolecular Chemistry

Background:

• Understanding the precise arrangement of atoms in organic molecules is crucial for predicting their physical and chemical properties.
• Investigating halogenated aromatic compounds provides insights into intermolecular forces and crystal packing.
• Comparing nitrile and isonitrile functional groups within similar molecular frameworks can reveal subtle structural differences.

Purpose of the Study:

• To determine and compare the crystal structures of 2,4,6-trichlorophenylisonitrile and 2,4,6-trichlorobenzonitrile.
• To analyze the intermolecular interactions, specifically halogen bonding, present in both structures.
• To investigate the degree of structural similarity and identify reasons for any differences in crystal packing.

Main Methods:

• Single-crystal X-ray diffraction was employed to elucidate the three-dimensional molecular structures.
• Analysis of bond lengths, bond angles, and intermolecular contacts.
• Comparison of crystal packing motifs and symmetry elements.

Main Results:

• Both 2,4,6-trichlorophenylisonitrile and 2,4,6-trichlorobenzonitrile exhibit normal molecular structures.
• Similar two-dimensional layers are formed in both compounds, stabilized by Cl···CN and Cl···NC interactions.
• The crystal structures are not isomorphous due to distinct layer-stacking arrangements.

Conclusions:

• Despite the presence of similar 2D layers and intermolecular interactions, the overall crystal structures of the title compounds differ.
• The observed differences in layer stacking highlight the sensitivity of crystal packing to subtle molecular variations and intermolecular forces.
• This study contributes to the understanding of structure-property relationships in halogenated aromatic compounds.