Figure 2 Ball-and-stick model of the coordination sphere of the potassium ion; with exception of the hydrogen atoms, which are shown as spheres of arbitrary radius, all other atoms are represented as displacement ellipsoids at the 70% probability level; covalent bonds of H2O are indicated as thick sticks (orange), strong/weak electrostatic interactions (yellow) as thick unbroken/broken ones. [Symmetry codes: (1) [{3\over 2}] - x, 1 - y, [{1\over 2}] + z; (2) -[{1\over 2}] + x, y, [{1\over 2}] - z; (3) 2 - x, [{1\over 2}] + y, 1 - z; (4) 2 - x, 1 - y, 1 - z.]  [article HTML]