The crystal structures of the acid salts of some monobasic acids. Part XI. Rubidium hydrogen diaspirinate (bisacetylsalicylate)

Abstract

The crystal structure of rubidium hydrogen diaspirinate, RbH[C₆H₄(OCOCH₃)CO₂]₂, has been solved by X-ray methods, and refined to R= 10·5% for 879 three-dimensional data. The rubidium ion lies on a two-fold axis and is co-ordinated to six oxygen atoms, belonging to six different acid groups, with Rb⁺⋯O = 2·84, 2·85, and 2·90 Å. The acidic hydrogen atom is involved in a short hydrogen bond, 0⋯O = 2·48 ± 0·02 Å, lying across a centre of inversion. The structure is isomorphous with that of the corresponding potassium salt, described in the following Paper.