Accessibility of Large Zero-Field Splitting
[Mn(dbm)2(py)2](ClO4) (dbm = anion of 1,3-diphenyl-1,3-propanedione(dibenzoylmethane), py = pyridine) is a compound of Mn(III). The spin state is a quintet with S=2. All spin Hamiltonian parameters, including the fourth-rank terms B4i were determined from the high-field, high-frequency spectra:
gx = 1.993(1), gy = 1.994(1), gz = 1.983(1)
D = – 4.504(2) cm-1 E = –0.425(1) cm-1
B40 = –1.8(4) ∙10-4 cm-1, B42 = 7(3) ∙10-4 cm-1, B44 = 48(4) ∙10-4 cm-1
The sign of the zero-field splitting parameters can be determined by analyzing the intensity pattern of a high-field spectrum because the Zeeman splitting is comparable to the thermal energy kT at low
temperatures. This spectrum was recorded on the transmission instrument.
Related Links
- Another spectrum measured on the Keck-magnet based spectrometer
- Synthesis, Crystal Structure, and High-Precision High-Frequency and -Field Electron Paramagnetic Resonance Investigation of a Manganese(III) Complex: [Mn(dbm)2(py)2](ClO4), by Aromi, G.; Telser, J.; Ozarowski, A.; Brunel, L.-C.; Stoeckli-Evans, H.-M. and Krzystek, J., Inorg. Chem., 44 (2), 187-196 (2005)
- Numbers Useful in EPR
