New mercury-contained cationic frameworks stabilized by (GaCl4)− unit via weak electrostatic forces in supramolecular compounds (Hg11P4)(GaCl4)4 and (Hg3AsS)(GaCl4)
Two new inorganic supramolecular compounds, (Hg11P4)(GaCl4)4 (1) and (Hg3AsS)(GaCl4) (2), have been prepared by the solid-state reactions. Their structures are characterized by mercury-containing cationic hosts and discrete (GaCl4)− guests, which is a derivative of a very strong Lewis acid. The three-dimensional cationic framework of 1, (Hg11P4)4+, is marvellously extended by Hg22+ and Hg32+ groups as well as Hg2+ ions to form two large tunnels with different sizes each embedded with two columns of (GaCl4)− anions. Compound 2 features a layered structure with (GaCl4)− tetrahedra being intercalated between two-dimensional (Hg3AsS)+ layers and it is the first mercury pnictidechalcohalide. It is found that the weak electrostatic forces between hosts and guests play a key role in the stabilization of the whole structures of 1 and 2, which is strikingly different from almost all the reported metal pnictidehalide and chalcohalide supramolecular compounds. Optical dielectric constants calculations show that both 1 and 2 possess strong dielectric anisotropy.