N-(2,4-Dimethyl-phen-yl)-2,2-diphenyl-acetamide

Area of Science:

• Crystallography
• Organic Chemistry
• Materials Science

Background:

• Understanding the solid-state structure of organic compounds is crucial for predicting their physical and chemical properties.
• Molecular conformation and intermolecular interactions dictate crystal packing and material behavior.

Purpose of the Study:

• To elucidate the crystal structure of the title compound C(22)H(21)NO.
• To analyze the molecular geometry, including dihedral angles between aromatic rings.
• To investigate the intermolecular interactions responsible for crystal stabilization.

Main Methods:

• Single-crystal X-ray diffraction was employed to determine the crystal structure.
• Analysis of bond lengths, bond angles, and dihedral angles was performed.
• Identification and analysis of intra- and intermolecular hydrogen bonds and pi-pi interactions were conducted.

Main Results:

• The asymmetric unit contains two crystallographically independent molecules (A and B).
• Significant variations in dihedral angles between benzene and dimethyl-benzene rings were observed between molecules A and B.
• Intramolecular C-H⋯O hydrogen bonds form S(6) ring motifs in each molecule.
• Bifurcated (N,C)-H⋯O hydrogen bonds link molecules into infinite chains along the a axis.
• Crystal structure is further stabilized by C-H⋯π and π-π interactions.

Conclusions:

• The crystal structure of C(22)H(21)NO exhibits complex molecular arrangements with distinct conformational preferences in the two independent molecules.
• The interplay of intramolecular hydrogen bonding and intermolecular interactions, including hydrogen bonds and pi-pi stacking, governs the overall crystal packing and stability.
• These findings provide fundamental insights into the structure-property relationships of this organic compound.