User:Handedplanes/Iron(II) thiocyanate

Iron(II) thiocyanate is a coordination polymer with formula Fe(SCN)2. It is a red brown air sensitive solid and its crystal structure first reported in 2020.

Structure
The structure of Fe(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 iron is octahedrally coordinated by four sulfurs and two nitrogens. The sulfur end of the SCN- ligand is doubly bridging.

Synthesis
Iron(II) thiocyanate can be prepared using salt metathesis using the reaction of potassium thiocyanate K(SCN) and iron(II) tetrafluoroborate in acetonitrile, filtering off the precipitated KBF4 to yield a solution of Fe(SCN)2. On removal of acetonitrile a pure microcrystalline powder of Fe(SCN)2 can be obtained.

Magnetism
Iron(II) thiocyanate, like iron(II) iodide, iron(II) bromide and iron(II) chloride, is an antiferromagnet at low temperatures.