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Tetrahedral HgS4 and linear HgS2 coordination in the crystal structure of Na2Hg3S4(H2O)2

1991; Elsevier BV; Volume: 10; Issue: 1 Linguagem: Inglês

10.1016/s0277-5387(00)83545-7

1873-3719

Raju Banda, D.C. Craig, Ian Dance, M.L. Scudder,

Crystal Structures and Properties

Abstract The colourless crystalline compound Na2Hg3S4(H2O)2 obtained from the heterogeneous reaction of HgS and Na2S in DMF containing residual water, contains mercury sulphide chains {[Hg2S3]2−}∞ in which tetrahedral HgS4 units [D2 site symmetry, HgS = 2.558(2) A] are linked along the chain by pairs of digonal mercury atoms [C2 site symmetry, HgS = 2.362(2) A, SHgS = 166.2(1)°]. These chains are separated by {[Na2(OH2)2]2+}∞ chains, and connected to them by OHS hydrogen bonds [3.261(7) A] and NaS contacts [2.946(5), 2.974(5) A]. The structure embodies and mimics the coordination in both of the HgS minerals, cinnabar and metacinnabar.