The high-energy intraconfigurational spin-forbidden bands in the spectra of quadrate chromium(III) complexes

The high-energy intraconfigurational spin-forbidden bands expected in the region of 20 000 cm−1 have been uncovered in the spectra of a number of trans-diacidobis(ethylenediamine) chromium(III)complexes. These bands have been fitted to the quadrate components of the cubic transition 4A2g → 2T2g including spin–orbit interaction. Two interconfigurational spin-forbidden bands in the spectrum of trans-[Cr(en)2(dmf)2](ClO4)3 have been uncovered and interpretted.