2,2,2-Trichloro-N-(2,5-dimethyl-phen-yl)acetamide

Area of Science:

• Organic Chemistry
• Crystallography

Background:

• Understanding the structural and bonding characteristics of organic molecules is crucial in chemistry.
• The specific compound C(10)H(10)Cl(3)NO presents an interesting case for structural investigation due to its substituents and potential for intermolecular interactions.

Purpose of the Study:

• To elucidate the precise spatial arrangement of the N-H bond relative to methyl substituents in C(10)H(10)Cl(3)NO.
• To investigate the intermolecular interactions, specifically hydrogen bonding, that govern the crystal packing of this compound.
• To characterize the crystallographic disorder observed for the chlorine atoms.

Main Methods:

• Single-crystal X-ray diffraction was employed to determine the molecular and crystal structure.
• Analysis of bond lengths, angles, and non-covalent interactions (hydrogen bonds) was performed.
• Disorder modeling was applied to account for the observed atomic positions of chlorine atoms.

Main Results:

• The N-H bond was found to be oriented syn to the 2-methyl group and anti to the 5-methyl group on the aromatic ring.
• Adjacent molecules are linked into chains via N-H⋯O hydrogen bonding, indicating significant intermolecular forces.
• Two chlorine atoms in the crystal structure exhibit positional disorder, each occupying two sites with equal probability.

Conclusions:

• The study provides a detailed structural description of C(10)H(10)Cl(3)NO, highlighting the influence of substituents on N-H bond orientation.
• Intermolecular N-H⋯O hydrogen bonding plays a key role in the self-assembly of the molecules in the solid state.
• The observed crystallographic disorder of chlorine atoms offers insights into the dynamic behavior or packing inefficiencies within the crystal lattice.