Ferrocene compounds. XXXIX. 1-Ferrocenylisochromane

Area of Science:

• Organometallic Chemistry
• Crystallography
• Supramolecular Chemistry

Background:

• Understanding the structural nuances of organometallic compounds is crucial for predicting their reactivity and properties.
• Cyclopentadienyl (Cp) ligands are fundamental in organometallic chemistry, influencing complex stability and electronic properties.
• Intermolecular interactions, such as C-H.pi interactions, play a significant role in crystal packing and material properties.

Purpose of the Study:

• To elucidate the detailed three-dimensional crystal structure of the iron compound [Fe(C(5)H(5))(C(14)H(13)O)].
• To analyze the conformation of the heterocyclic and cyclopentadienyl rings within the crystal lattice.
• To investigate the nature and significance of intermolecular C-H.pi interactions in the crystal packing.

Main Methods:

• Single-crystal X-ray diffraction was employed to determine the molecular and crystal structure.
• Analysis of bond lengths, bond angles, and dihedral angles provided insights into ring conformations.
• Identification and quantification of intermolecular C-H.pi interactions were performed.

Main Results:

• The heterocyclic ring adopts a half-chair conformation, nearly perpendicular to the substituted cyclopentadienyl ring.
• The two cyclopentadienyl rings are nearly parallel, with a dihedral angle of 2.7 degrees, and are almost halfway between eclipsed and staggered.
• Significant C-H.pi interactions involving phenyl and unsubstituted cyclopentadienyl rings were observed, contributing to a 3D framework.

Conclusions:

• The study provides a detailed structural characterization of the iron compound, highlighting unique conformational preferences.
• C-H.pi interactions are identified as key stabilizing forces in the crystal structure, dictating the overall molecular assembly.
• The findings contribute to the understanding of structure-property relationships in organometallic complexes.