hexaaquamanganeseII

Hexaaquamanganese(II) is an inorganic coordination compound with the chemical formula [Mn(H2O)6]2+. It is the most common form in which manganese(II) ions exist in aqueous solution. The central manganese ion, Mn2+, is coordinated to six water molecules, forming an octahedral geometry. This complex is typically pale pink in color due to the d-d electronic transitions within the manganese ion.

Hexaaquamanganese(II) can be prepared by dissolving manganese(II) salts, such as manganese(II) sulfate or manganese(II) chloride, in water. The solubility of these salts allows for the formation of the hydrated complex. The stability of the hexaaquamanganese(II) complex in aqueous solution is relatively high, although it can be displaced by ligands with a stronger affinity for manganese(II).

In solution, the hexaaquamanganese(II) ion is diamagnetic, as the manganese(II) ion has a d5 electron configuration where all unpaired electrons are in the high-spin configuration, resulting in no net magnetic moment. However, in solid compounds where the manganese(II) ion is in a different coordination environment, it can exhibit paramagnetic properties.

The hexaaquamanganese(II) ion plays a role in various chemical processes and is a common precursor in the synthesis of other manganese compounds. Its spectroscopic properties, particularly its UV-Vis absorption spectrum, are characteristic of the Mn2+ ion in an octahedral field and are often used for its identification and quantification.