Tris(2,2'-bi-pyridine)-iron(II) tris-(di-cyano-methylidene)methane-diide

Area of Science:

• Coordination Chemistry
• Crystal Engineering
• Supramolecular Chemistry

Background:

• Iron complexes with bipyridine ligands are crucial in various chemical applications.
• Understanding the supramolecular assembly of coordination compounds is key to designing new materials.
• The tris-(di-cyano-methyl-idene)methane-diide anion presents unique structural and electronic properties.

Purpose of the Study:

• To elucidate the crystal structure of the title compound, [Fe(C10H8N2)3][C{C(CN)2}3].
• To analyze the coordination environment and symmetry of the iron(II) complex.
• To investigate the intermolecular interactions, specifically hydrogen bonding, that govern the crystal packing.

Main Methods:

• Single-crystal X-ray diffraction was employed to determine the molecular and crystal structure.
• Crystallographic symmetry operations were analyzed to understand the arrangement of ions.
• Intermolecular interactions, including hydrogen bonds, were identified and characterized.

Main Results:

• The asymmetric unit contains one iron-bipyridyl cation and disordered anion units.
• The iron(II) cation exhibits threefold symmetry, while the anions possess 3 symmetry.
• Complex layered structures parallel to (001) are formed by hydrogen bonds, extending into a 3D network.

Conclusions:

• The crystal structure reveals a 1:1 ratio of cations to anions due to crystallographic site symmetry.
• Hydrogen bonding plays a critical role in assembling the complex three-dimensional supramolecular network.
• The findings contribute to the understanding of crystal engineering principles for coordination compounds.