Near-infrared ²E_g → ⁴A_2g and visible LMCT luminescence from a molecular <i>bis</i>-(tris(carbene)borate) manganese(IV) complex

Abstract

The molecular bis-(tris(carbene)borate) manganese(IV) complex [{PhB(MeIm) 3 } 2 Mn](OTf) 2 shows 2 E g → 4 A 2g luminescence at 828 nm in the solid state at 85 K; this wavelength is longer by approximately 100 nm than the wavelengths typically observed for manganese(IV) and chromium(III) doped solids and for molecular chromium(III) complexes. Weak luminescence is also observed from a LMCT excited state with an absorption maximum at 500 nm. This represents the first molecular manganese(IV) compound for which luminescence has been reported.