| Abstract: | Synthesis and Crystal Structure of Na(12-Crown-4)2]2Hg(Se4)2] · 1.5 DMF . The title compound has been prepared by the reaction of Na2Se4 with mercury acetate in DMF solution in the presence of 15-crown-5, forming dark red crystal needles. Na(12-crown-4)2]2Hg(Se4)2] · 1.5 DMF crystallizes in the space group C2/c with eight formula units per unit cell. The structure was determined with 3 824 observed unique reflections, R = 0.085. Lattice dimensions at - 70°C: a = 2 884(2), b = 1 407.7(7), c = 2 843(2) pm, β = 93.93(5)°. The structure consists of Na(12-crown-4)2]+ ions with a sandwichlike coordination of the crown ether molecules, and of Hg(Se4)2]2? ions, in which the mercury atom is coordinated by two tetraselenido ions in a chelating fashion. The Hg(Se4)2]2? ions are arranged to infinite chains via Se…?Se contacts. |
