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N-(3,4-Dimethyl-phen-yl)-4-methyl-benzamide
This study details the crystal structure of a C(16)H(17)NO compound, revealing distinct molecular conformations and intermolecular hydrogen bonding that form crystal chains.
Area of Science:
- Crystallography
- Organic Chemistry
- Materials Science
Background:
- Understanding the solid-state structure of organic molecules is crucial for predicting their properties.
- Conformational isomerism and intermolecular interactions significantly influence crystal packing and material characteristics.
Purpose of the Study:
- To elucidate the crystal structure of the title compound, C(16)H(17)NO.
- To analyze the conformational differences between molecules in the asymmetric unit.
- To investigate the nature of intermolecular interactions within the crystal lattice.
Main Methods:
- Single-crystal X-ray diffraction was employed to determine the three-dimensional structure.
- Analysis of bond lengths, bond angles, and dihedral angles provided conformational insights.
- Identification of intermolecular interactions, such as hydrogen bonds, was performed.
Main Results:
- The asymmetric unit contains two crystallographically independent molecules of C(16)H(17)NO.
- The N-H bond conformation relative to the meta-methyl group differs between the two molecules (anti vs. syn).
- Significant differences in dihedral angles between the benzene rings were observed (52.6° vs. 10.5°).
- Intermolecular N-H⋯O hydrogen bonds were identified, forming chains along the crystal's b axis.
Conclusions:
- The crystal structure of C(16)H(17)NO exhibits conformational polymorphism within the asymmetric unit.
- Intermolecular hydrogen bonding plays a key role in organizing the molecules into extended chain structures.
- These findings provide fundamental insights into the solid-state behavior of this organic compound.
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