2-(phenylaminomethylidene)cyclohexane-1,3-dione

Area of Science:

• Organic Chemistry
• Crystallography
• Molecular Structure Analysis

Background:

• Understanding molecular tautomerism is crucial in organic chemistry.
• The electronic and conformational properties of organic compounds dictate their reactivity and function.
• Detailed structural analysis provides insights into molecular stabilization and interactions.

Purpose of the Study:

• To elucidate the predominant tautomeric form of the title compound, C(13)H(13)NO(2).
• To investigate the electronic properties, including pi-electron density polarization.
• To determine the conformational behavior of the phenyl and cyclohexane rings and analyze intermolecular interactions.

Main Methods:

• X-ray crystallography was employed to determine the precise molecular structure.
• Analysis of electron density distribution revealed pi-electron polarization.
• Conformational analysis of the rings and identification of intermolecular contacts (C-H.O) were performed.

Main Results:

• The compound exists predominantly in an azomethino-1,3-diketone tautomeric form.
• A polarization of pi-electron density from the amine N atom to carbonyl groups was observed.
• The phenyl ring is deconjugated with the adjacent pi system, and the cyclohexane ring adopts an unsymmetrical half-chair conformation.
• Intramolecular hydrogen bonding stabilizes the molecule, with intermolecular packing influenced by C-H.O contacts.

Conclusions:

• The study confirms the azomethino-1,3-diketone tautomer as the dominant form for C(13)H(13)NO(2).
• The findings provide a comprehensive understanding of the compound's electronic and structural characteristics.
• The identified stabilization mechanisms and intermolecular interactions are key to the compound's solid-state behavior.