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Figure 3 : Ball-and-stick representation of the sodium environment; with exception of the hydrogen atoms, which are shown as spheres with common isotropic radius, all other atoms are represented as thermal displacement ellipsoids showing 50% probability level of the corresponding atom; covalent bonds as black rods, coordinative bonds as white ones; symmetry codes: (1) x, y, z; (2) −1 + x, y, z; (3) −1 + x, 1 + y, z; (4) −x, 1 − y, z; (5) −x, 1 − y, 1 − z; (6) x, 1 + y, z; (7) −x, 2 − y, -z. |