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Inorganic Chemistry

Manganese

Manganese is a fairly common element found in minerals, and is also biologically important. Manganese has only one stable isotope, 55Mn. Manganese can exist in many oxidation states with the most common states being Mn(II), Mn(IV), and Mn(VII). We will be looking at Mn(II). Mn(II) has 5 unpaired electrons, and a spin quantum number of 5/2, so this can lead to quite complicated spectra. This laboratory exercise compares the spectra of a number of different Mn(II) compounds. Some of the spectra have quite broad lines while others have narrow lines with quite a bit of fine structure.

Goals:

  • Look at various manganese spectra

Transition Metals and Hyperfine Splitting

The electrons in atoms and molecules absorb the microwaves in EPR, but the electrons also interact with nearby magnetic nuclei. This interaction gives rise to what is called hyperfine splitting. This laboratory exercise requires the synthesis of two vanadyl compounds. The ESR spectra are then compared, and the splitting observed by the different ligands is discussed.