Zero-Field Splittings in tris(Oxalatochromium) (III) Complexes

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Abstract
The spin Hamiltonians of Cr(ox)33− in the crystalline hosts K3Al(ox)3·3H2O, (NH4)3Al(ox)3·2H2O, and Na3Al(ox)3·5H2O have been evaluated from ESR spectroscopy and compared with the Cr3+:NaMgAl(ox)3·9H2O results. The D parameter (0.72 ± 0.06 cm−1) is relatively insensitive to environment but E varies from zero to 0.1 cm−1. A comparison of the ESR and optical spectra indicates the need to include rhombic components in ligand field treatments of 2E and 4T2 splittings. The so‐called monoclinic and heated Cr3+:NaMgAl(ox)3·9H2O forms behave identically in ESR and optical measurements.