Spectroscopic and structural characterization of hexaamminecobalt(III) dibromide permanganate

Abstract

Structural and spectroscopic characterization (SXRD, IR, liq. N2 temperature Raman, UV) of hexaamminecobalt(III) dibromide permanganate, [Co(NH3)6]Br2(MnO4) (compound 1), are described. There is a 3D hydrogen bond network including N–H···O–Mn and N–H···Br interactions, which could serve as potential reaction centres for solid-phase redox reactions between the ammonia ligands and/or bromide ions as reductants and permanganate ions as oxidant agents. The effect of the nature of halogen ions on the structural and spectroscopic properties of [Co(NH3)6]Br2(MnO4) and the analogous chloride compound, [Co(NH3)6]Cl2(MnO4) (compound 2), are discussed in detail.

Keywords

• permanganate
• ammine
• cobalt(iii)
• ir and raman spectroscopy
• solid-phase quasi-intramolecular redox reaction.