Organically templated layered uranium( VI) phosphates: hydrothermal syntheses and structures of [NHEt 3][(UO 2) 2(PO 4)(HPO 4)] and [NPr 4][(UO 2) 3(PO 4)(HPO 4) 2]
Abstract
Two organically templated layered uranium( VI) phosphates have been prepared under hydrothermal conditions from U 3O 8 and H 3PO 4 using either NPr 4 + or NHEt 3 + ions as structure directing agents; both compounds have layered structures which contain infinite chains of edge-sharing [UO 7] pentagonal bipyramids cross linked by bridging [PO 4] tetrahedra to form two dimensional sheets of [(UO 2) n - (HPO 4) n–1 (PO 4)] m m– anions.