User:Handedplanes/Manganese(II) thiocyanate

Manganese(II) thiocyanate is a coordination polymer with formula Mn(SCN)2. It is a pale yellow deliquescent solid and its crystal structure was determined first in 2020.

Structure
The structure of Mn(SCN)2 was determined via powder diffraction and consists of two-dimensional sheets held together through Van der Waals forces. It belongs to mercury thiocyanate structure-type and can be considered a distorted form of the MnBr2 (CdI2) structure. Each manganese is octahedrally coordinated by four sulfurs and two nitrogens. The sulfur end of the SCN- ligand is doubly bridging.

Synthesis
Manganese(II) thiocyanate can be prepared using salt metathesis using the reaction of barium thiocyanate Ba(SCN) and manganese(II) sulfate in water, filtering off the precipitated BaSO4 to yield a solution of Mn(SCN)2. On removal of water a pure microcrystalline powder of Mn(SCN)2 can be obtained.

Magnetism
Manganese(II) thiocyanate, like manganese(II) iodide, manganese(II) bromide and manganese(II) chloride, is an antiferromagnet at low temperatures, ordering at $$T_N=29$$K.