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In the natrochalcite-type compounds NaCu 2 (H 3 O 2 )(SO 4 ) 2  and RbCu 2 (H 3 O 2 )(SeO 4 ) 2  the lengths of the two different hydrogen bridges vary widely: 2.44 Å and 2.70 Å in the Na-S member, and 2.60 Å and 3.03 Å in the Rb-Se member. Both structures were refined by single-crystal neutron diffraction methods. Least-squares refinements (harmonic vibrations for all atoms) resulted in a splitting of the H atom positions of the short bridges by 0.265(13) Å in the Na-S member, and by 0.472(6) Å in the Rb-Se member. In the two compounds no clear evidence for an ordering of the split position of the H atom was found.

zeitschrift für kristallographie - crystalline materials

Neutron refinements of NaCu 2 (H 3 O 2 )(SO 4 ) 2  and RbCu 2 (H 3 O 2 )(SeO 4 ) 2 : Variation of the hydrogen bond system in the natrochalcite-type series