Manganese(II) diselenide is the

inorganic compound In chemistry, an inorganic compound is typically a chemical compound that lacks carbon–hydrogen bonds, that is, a compound that is not an organic compound. The study of inorganic compounds is a subfield of chemistry known as '' inorganic chemis ...

with the formula MnSe₂. This rarely encountered solid is structurally similar to that of

iron pyrite The mineral pyrite (), or iron pyrite, also known as fool's gold, is an iron sulfide with the chemical formula Fe S2 (iron (II) disulfide). Pyrite is the most abundant sulfide mineral. Pyrite's metallic luster and pale brass-yellow hue gi ...

(FeS₂). Analogous to the description of iron pyrite, manganese diselenide is sometimes viewed as being composed of Mn²⁺ and Se₂²⁻ ions, although being a

semiconductor A semiconductor is a material which has an electrical conductivity value falling between that of a conductor, such as copper, and an insulator, such as glass. Its resistivity falls as its temperature rises; metals behave in the opposite way ...

, MnSe₂ is not appropriately described in formal oxidation states. The high‐resolution Mn 2p spectra of the MnSe₂ has two distinct peaks at 642.2 and 653.9

electronvolt In physics, an electronvolt (symbol eV, also written electron-volt and electron volt) is the measure of an amount of kinetic energy gained by a single electron accelerating from rest through an electric potential difference of one volt in vacu ...

s 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 Se²⁻ ions in MnSe₂.

References

Selenides Manganese(II) compounds Transition metal dichalcogenides {{inorganic-compound-stub