Structure of the intercalate NaWO₂Cl₂

NaWO₂Cl₂, F_w = 309.74, is formed by the intercalation of sodium into WO₂Cl₂. The structure of the intercalate has been determined using a combination of constant wavelength and time-of flight powder neutron diffraction data. NaWO₂Cl₂ adopts orthorhombic symmetry, space group Ammm (No. 65), with a = 3.7943(3), b = 3.8006(4), and c = 15.739(1) Å; Z = 2; V = 226.96 ų; and D_cal = 4.53 g cm^-3. The structure consists of blocks, each containing a layer of both W and O atoms sandwiched between two layers of Cl atoms. The trilayer blocks [ClWO₂Cl] are stacked in the direction perpendicular to the layers, i.e., parallel to the c-axis, and are separated by Na⁺ ions located in two sets of sites between adjacent chlorine layers. The basic structure is related to that of the parent material WO₂Cl₂ by a displacement of the [ClWO₂Cl] blocks in the basal plane. © 1991.