LAUSR

Abstract The ionic liquid 1-ethyl-3-methylimidazolium diethyl phosphate (EMIM-Et2PO4) was used in the synthesis of four new hybrid organic-inorganic uranyl phosphates. The structure of (UO2)[PO2(OC2H5)2]2 (1) is triclinic, P-1, a = 5.374(3) A, b = 7.674(4) A, c = 11.132(6) A, α = 105.333(6)°, β = 90.562(6)°, γ = 98.269(6)°, Z = 4. The structure of (C6N2H11){(UO2)2(NO3)2[PO2(OC2H5)2]3} (2) is triclinic, P-1, a = 9.316(3) A, b = 11.890(4) A, c = 18.477(7) A, α = 91.197(4)°, β = 102.993(4)°, γ = 102.625(4)°, Z = 2. The structure of {(UO2)(H2O)[PO2(OC2H5)2]2} (3) is monoclinic, P21/c, a = 9.2005(7) A, b = 10.1531(8) A, c = 18.5968(14) A, β = 99.6447(9)°, Z = 4. The structure of (C6N2H11){(UO2)2[PO2(OC2H5)2]3(PO3OC2H5)} (4) is monoclinic, C2/c, a = 36.048(10) A, b = 13.553(4) A, c = 18.583(5) A, β = 119.454(3)°, Z = 8. The variable reactants, thermal conditions, and crystallization times resulted in diverse topologies unique to uranyl phosphate chain (1 and 2) and sheet (3 and 4) structures.