Abstract: | The title complex, [MnHg(SCN)4(CH4N2O)3]n, consists of slightly distorted octahedral MnN3O3 and tetrahedral HgS4 units. The MnII atom is coordinated by the O atoms of three urea molecules and by the N atoms of three SCN? ions; HgII is coordinated by four S atoms from SCN? ions. Each pair of MnII and HgII atoms is connected by an –SCN– bridge, forming infinite two‐dimensional –Mn—NCS—Hg– networks. |