Two organically-templated layered uranium(IV) fluorooxalates, (H4TREN)[U2F6(C2O4)(3)] center dot 4H(2)O ( 1) (TREN = tris(2-aminoethyl) amine) and (H(4)APPIP)[U2F6(C2O4)(3)] center dot 4H(2)O ( 2) (APPIP = 1,4-bis(3-aminopropyl) piperazine), have been syn