Hennings E1, Schmidt H1, Voigt W1.
Acta Crystallogr Sect E Struct Rep Online. 2014 Nov 15;70(Pt 12):489-93. doi: 10.1107/S1600536814024532. eCollection 2014.The title compounds, calcium perchlorate tetra-hydrate and calcium perchlorate hexa-hydrate, were crystallized at low temperatures according to the solid-liquid phase diagram. The structure of the tetra-hydrate consists of one Ca(2+) cation eightfold coordinated in a square-anti-prismatic fashion by four water mol-ecules and four O atoms of four perchlorate tetra-hedra, forming chains parallel to [01-1] by sharing corners of the ClO4 tetra-hedra. Read More