9-Ethynyl-9H-carbazole.

Area of Science:

• Crystallography
• Organic Chemistry
• Materials Science

Background:

• Ynamines are a class of organic compounds containing a carbon-carbon triple bond adjacent to a nitrogen atom.
• Crystallographic characterization of ynamines, particularly those with terminal H atoms, is rare.
• Understanding the structural and electronic properties of ynamines is crucial for their application in synthesis and materials science.

Purpose of the Study:

• To elucidate the crystal structure of a novel ynamine with a terminal H atom.
• To analyze the molecular geometry, including bond lengths and planarity.
• To investigate the intermolecular interactions and crystal packing of the ynamine.

Main Methods:

• Single-crystal X-ray diffraction was employed to determine the three-dimensional structure of the ynamine.
• Analysis of bond lengths (N-C(sp), C≡C, C(sp)-H) and molecular planarity (r.m.s. deviation).
• Examination of crystal packing and intermolecular contacts, including π-π stacking interactions.

Main Results:

• The title compound, C(14)H(9)N, was characterized crystallographically as an ynamine with a terminal H atom.
• Two independent, essentially planar molecules (A and B) were identified in the asymmetric unit.
• Specific bond lengths (N-C(sp), C≡C, C(sp)-H) were determined and found consistent with related ynamines.
• Columnar crystal structures were observed, with molecule A exhibiting π-π stacking interactions.

Conclusions:

• The crystallographic data confirms the unique structure of this ynamine.
• The observed planarity and bond lengths are characteristic of this class of compounds.
• The study provides insights into the solid-state behavior and intermolecular forces governing ynamine crystal packing.