Potassium beryllium selenate dihydrate, K2Be(SeO4)2·2H2O: Preparation, structure and infrared spectroscopy

The strengths of the hydrogen bonds in the title compound as deduced from the infrared wavenumbers of the uncoupled OD stretches of matrix-isolated HDO molecules (isotopically dilute sample) are discussed in terms of the Ow⋯O hydrogen bond distances, the different hydrogen bond acceptor capabilities of the selenate oxygen atoms and the strong Be-OH2 interactions (synergetic effect). The intramolecular O-H bond lengths are derived from the νOD vs. rOH correlation curve [J. Mol. Struct. 404 (1997) 63].