Syntheses and structures of two selenite chloride hydrates: Co(HSeO3)Cl center dot 3 H2O and Cu(HSeO3)Cl center dot 2 H2O

The first selenite chloride hydrates, Co(HSeO3)Cl .3 H2O and Cu(HSeO3)Cl . 2H(2)O, have been prepared from solution and characterised by single-crysta l X-ray diffraction. The cobalt phase adopts an unusual "one-dimensional" s tructure built up from vertex-sharing pyramidal [HSeO3](2-), and octahedral [CoO2(H2O)(4)](2-) and [CoO2-(H2O)(2)Cl-2](4-) units. Inter-chain bonding is by way of hydrogen bonds or van der Waals' interactions. The atomic arra ngement of the copper phase involves [HSeO3](2-) pyramids and Jahn-Teller d istorted [CuCl2(H2O)(4)] and [CuO4Cl2](8-) octahedra, sharing vertices by w ay of Cu-O-Se and Cu-Cl-Cu bonds. Crystal data: Co(HSeO3)Cl .3 H2O, M-r = 2 76.40, triclinic, space group P (1) over bar (No. 2), n = 7.1657(5) Angstro m, b = 7.3714(5) Angstrom, c = 7.7064(5) Angstrom, alpha = 64.934(1)degrees beta = 68.894(1)degrees, gamma = 71.795(1)degrees V = 337.78(7) Angstrom ( 3) Z = 2, R(F) = 0.036, wR(F) = 0.049. Cu(HSeO3) Cl . 2H(2)O, M-r = 263.00, orthorhombic, space group Pnma (No. 62), a = 9.1488(3) Angstrom, b = 17.83 51(7) Angstrom, c = 7.2293(3) Angstrom, V = 1179.6(2) Angstrom (3), Z = 8, R(F) = 0.021, wR(F) = 0.024.