Manganese diselenide

Manganese diselenide is the inorganic compound with the formula MnSe₂. This rarely encountered solid is structurally similar to that of iron pyrite (FeS₂). Analogous to the description of iron pyrite, manganese diselenide is sometimes viewed as being composed of Mn²⁺ and Se₂^{2−} ions, although being a semiconductor, MnSe₂ is not appropriately described in formal oxidation states.

Spectroscopy

The high‐resolution Mn 2p spectra of the MnSe₂ has two distinct peaks at 642.2 and 653.9 electronvolts correspond to the Mn 2p3/2 and Mn 2p1/2 spin–orbit components, respectively. The energy difference (Δ 2p) of 11.7 eV confirms the presence of Mn⁴⁺ ions in the sample. A good correlation was observed with the literature value for the Mn⁴⁺ state. No peaks for Mn²⁺ ions were observed at 640–641 eV, which confirmed the formation of only the Mn⁴⁺ oxidation state with a d³ electronic configuration. The Se 3d spectra were deconvoluted into two well‐defined peaks (3d5/2 and 3d3/2) at a binding energy of 54.46 and 55.31 eV, respectively. These two peaks confirmed the presence of Se^{2−} ions in MnSe₂.

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