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The reaction of sodium N-morpholine acetate with selenic and sulfuric acid and uranyl nitrate results in the formation of two novel open-framework compounds, |Na(Hmfa)|[(UO 2 ) 2 (SeO 4 ) 3 (H 2 O)](H 2 O) 2  ( NaUSe ) and [Na 2 (SO 3 OH)(Hmfa)]|(UO 2 )(SO 4 ) 2 | ( NaUS ), respectively. Despite identical synthetic procedures, sulfate structure dramatically differs from selenate compound. Their common feature is an open-framework featuring two-dimensional system of channels occupied by protonated morpholino-N-acetic acid species. Coordination of Na atoms is different. In  NaUSe , [(UO 2 ) 2  (SeO 4 ) 3 (H 2 O)] 2−  layers are pillared by {Na 2 O 8 (H 2 O) 2 (Hmfa) 2 } complexes to form a microporous framework. In  NaUS , UO 7  and SO 4  polyhedra of [(UO 2 )(SO 4 ) 2 ] 2−  chains share common oxygen atoms with Na-centered tetrameric complexes providing a three-dimensional integrity of the structure. Both of the compounds are characterized by IR spectroscopy.

Open-framework sodium uranyl selenate and sodium uranyl sulfate with protonated morpholino-N-acetic acid