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.