{[P(o-tolyl)3]Br}2[Cu2Br6](Br2)--an ionic compound containing molecular bromine

Area of Science:

• Inorganic Chemistry
• Crystallography
• Materials Science

Background:

• Ionic liquids offer unique reaction environments for synthesizing novel inorganic compounds.
• Triphenylphosphine ligands and copper(II) bromide are common precursors in coordination chemistry.
• Molecular bromine can be incorporated into crystal structures, influencing their properties.

Purpose of the Study:

• To synthesize and characterize a novel crystalline compound containing bromocuprate, a phosphine ligand, and molecular bromine.
• To investigate the structural features and bonding within the newly formed crystal.
• To explore the use of ionic liquids as reaction media for such syntheses.

Main Methods:

• Synthesis of {[P(o-tolyl) 3]Br} 2[Cu 2Br 6](Br 2) crystals via reaction of P(o-tolyl) 3, CuBr 2, and Br 2 in an ionic liquid ([NMeBu 3][N(Tf) 2]).
• X-ray crystallography to determine the crystal structure (triclinic, space group P1).
• Thermogravimetry and mass spectrometry to verify the presence of molecular bromine.

Main Results:

• Formation of dark green cuboid-shaped crystals of {[P(o-tolyl) 3]Br} 2[Cu 2Br 6](Br 2).
• Crystal structure analysis revealed triclinic symmetry with specific lattice parameters and angles.
• The compound contains {[P(o-tolyl) 3]Br}+ cations, [Cu 2Br 6]2- anions, and molecular dibromine (Br-Br distance of 2.341(1) A).

Conclusions:

• Successful synthesis and structural elucidation of a novel bromocuprate compound incorporating molecular bromine.
• The ionic liquid served as an effective medium for the crystallization of this complex structure.
• The characterization confirms the presence and integration of molecular bromine within the crystal lattice.