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The quartet and doublet transition in trans-[Cr(ox) 2 (py) 2 ] -  show considerable band splittings due to the low-symmetry of the ligand field. The components of  2 E g (Oh) and  2 T 1 g (Oh ) have been assigned by analysis of vibrational sideband structures in the low-temperature absorption and emission spectra. The energy level scheme has been rationalized in terms of the angular-overlap model. The different contributions of n bonding from the oxalate (n donor) and pyridine (n acceptor) ligands give an explanation of the uncommon quartet band splittings. The doublet energies depend strongly on the molecular geometry. In particular, a reduction of the oxalate bite angle to about 84° has been derived from the spectral band fit.

Electronic Spectra and an Angular-Overlap-Model Analysis of trans-[Cr(ox) 2 (py) 2 ] -