[en] The syntheses and characterization of uranyl complexes containing the OP(Se)(OEt)${}_2$${}^{-<!--\; ???\; -->}$ or OP(Te)(OEt)${}_2$${}^{-<!--\; ???\; -->}$ ligands are described. The U(VI) complexes UO${}_2$(OP(Se)(OEt)${}_2$)${}_2$(OP(NMe${}_2$)${}_3$)${}_2$ (1) and UO${}_2$(OP(Te)(OEt)${}_2$)${}_2$(OP(NMe${}_2$)${}_3$)${}_2$ (4) were prepared by the reaction of UO${}_2$(NO${}_3$)${}_2$(OP(NMe${}_2$)${}_3$)${}_2$ with the corresponding NaOP(E)(OEt)${}_2$ salt in THF (E=Se, Te). The complexes UO${}_2$(OP(Se)(OEt)${}_2$)${}_2$(OPPh${}_3$)${}_2$ (2) and UO${}_2$(OP(Se)(OEt)${}_2$)${}_2$(OAsPh${}_3$)(HOMe) (3) were prepared by the reaction of [UO${}_2$Cl${}_2$(THF)${}_2$]${}_2$ with NaOP(Se)(OEt)${}_2$ in THF solution in the presence of OPPh${}_3$ (2) or OAsPh${}_3$ (3) and recrystallised from THF (2) and HOMe (3) respectively. Although the OP(E)(OEt)${}_2$${}^{-<!--\; ???\; -->}$ (E=Se, Te) ligands may be able to act as bidentate chelate ligands, evidence for the weak coordination of the Se atom to the uranium(VI) centre was only observed in complexes 2 and 3. No coordination of the Te atom to the U(VI) centre in complex 4 was observed. Complexes 2-3 were characterized using vibrational (IR, Raman) spectroscopy. In addition, the structures of compounds 1-4 were determined using single crystal X-ray diffraction techniques: Compounds 2 and 3 are examples of structurally characterized compounds containing significant U(VI)-Se interactions. (© 2021 The Authors. Zeitschrift für anorganische und allgemeine Chemie published by Wiley-VCH GmbH)