I. Olovsson
Aug 1, 1968
Citations
0
Influential Citations
60
Citations
Journal
Journal of Chemical Physics
Abstract
The crystal structure of HClO4·2H2O has been determined from single‐crystal x‐ray data obtained at −190°C. The crystals are orthorhombic, space group Pnma, with four formula units in a cell of dimensions: a = 5.819, b = 10.598, c = 7.369 A. The water molecules are bonded to each other into pairs by a very short hydrogen bond (2.424 A), forming H5O2+ ions. With the space group chosen there is a center of symmetry in the middle of this hydrogen bond; the H5O2+ ion is perfectly staggered. The H5O2+ ions are hydrogen bonded to the ClO4− ions into layers, which are held together by van der Waals forces. The average Cl–O distance in the perchlorate ion is 1.438 A.