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The first uranyl beryllophosphate, [(UO 2 ) 2 {Be(H 2 O) 2 (PO 4 ) 2 }]·(H 2 O), has been synthesized under hydrothermal conditions at 200°C. The monoclinic unit-cell parameters are:  a =9.3361(1),  b =8.8545(4),  c =9.6592(10) Å, β=93.211(1)°,  V =797.21(6) Å 3 , space group  P 2 /n ,  Z =2. The crystal structure has been solved by direct methods and refined to final  R  1 =4.92% using 1294  I &gt;3σ( I ) reflections in the anisotropic approximation. The structure consists of sheets of  Ur O 5  pentagonal bipyramids and PO 4  tetrahedra.  Ur O 5  bipyramids are linked by edge-sharing to form infinite chains. Adjacent chains of  Ur O 5  bipyramids are connected by sharing alternating edges of uranyl bipyramids with PO 4  tetrahedra. The resulting sheets are based on the well-known uranophane anion-topology. Be atoms are tetrahedrally coordinated by two oxygen atoms of PO 4  tetrahedra and two water molecules in the interlayer space. One isolated water molecule also occurs in the interlayer space, where it is held in position by H bonds. The connection between the phosphorus and beryllium tetrahedra leads to formation of an unbranched trimer [BeP 2 O 8 (H 2 O) 2 ] 4−  observed for the first time in inorganic oxysalts.

zeitschrift für kristallographie - crystalline materials 

Synthesis, IR spectroscopy and crystal structure of [(UO 2 ) 2 {Be(H 2 O) 2 (PO 4 ) 2 }]·(H 2 O), the first compound with a trimer beryllophosphate anion