In the title complex, {[MnHg(SCN)₄(H₂O)₂]·2C₄H₉NO}_n, each Mn atom is octahedrally coordinated to four equatorial thio­cyanate N atoms and two axial water O atoms. The Mn atom and two O atoms lie on a twofold axis. Two kinds of crystallographically independent Hg atoms (denoted Hg1 and Hg2) are tetrahedrally coordinated with four thiocyanate S atoms and each Hg atom lies on a axis. N,N-Di­methyl­acet­amide mol­ecules are connected to coordinated water mol­ecules through hydrogen bonds. Each pair of Mn and Hg atoms is bridged via one thiocyanate ion. An Mn₂Hg1Hg2(SCN)₄ 16-membered ring is formed as a unit and the four metal atoms are in a chair-form tetrahedral arrangement. The units are linked with one another and form infinite two-dimensional networks.

The title complex, {[CdHg(SCN)₄(C₄H₉NO)₂]₂}_n, contains two crystallographically independent Cd^II centres and two Hg^II centres. Each Cd^II atom is bound to four N atoms belonging to SCN groups and to two O atoms from N,N-di­methyl­acet­amide (DMA) ligands in an octahedral geometry. Each Hg^II centre is tetrahedrally coordinated by four SCN S atoms.

In the title complex, [MnHg(NCS)₄(C₃H₈O₂)]_n, each Hg atom is tetrahedrally coordinated with four S atoms of the SCN^- ions, and each Mn atom is octahedrally coordinated with four N atoms of the SCN^- ions, one hydroxyl O atom and one ethereal O atom of the glycol mono­methyl ether mol­ecule. Each pair of Hg and Mn atoms is bridged by one SCN^- ion. A 24-membered Mn₃Hg₃(SCN)₆ ring is formed as the strucrural unit, with the six metal atoms in a chair-form hexagonal arrangement. The units are condensed and linked three-dimensionally in the crystal resulting in a diamond-like structure.

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

In the title complex, [MnHg(SCN)₄(C₂H₆SO)₂]_n, each Hg atom is tetrahedrally coordinated to four S atoms of the SCN ions, while each Mn atom is octahedrally coordinated to four N atoms of the SCN ions and two O atoms of the di­methyl sulfoxide mol­ecules which occupy the trans positions. Each pair of Hg and Mn atoms is bridged by one SCN ion. Two Mn atoms, two Hg atoms and four SCN ions make a 16-membered ring which organises into a two-dimensional network. The di­methyl sulfoxide ligands are extended perpendicular to the plane on both sides.

The Cd^II ion in the title complex, [Cd(SCN)₂{SC(NH₂)₂}₂], is situated at a centre of symmetry, and is bound to two N atoms belonging to thio­cyanate groups and to four S atoms of bridging thio­urea ligands. The structure consists of infinite chains of slightly distorted edge-shared Cd-centred octahedra. The bridging S atoms of two thio­urea ligands comprise the common edge. Some thermal properties are described.

In the title complex, [Hg(CH₄N₂S)₄][Mn(NCS)₄], the Hg and Mn atoms sit at special positions with symmetry and are tetrahedrally coordinated to four thio­urea (TU) S and four thio­cyanate (SCN) N atoms, respectively. The structure consists of discrete cationic and anionic [Hg(TU)₄]²⁺ and [Mn(SCN)₄]^2- complexes, and weak N_TU-HS_SCN hydrogen-bond bridges exist between these complexes.