The structure and spectroscopic characterization of UO22+ complexes with tetraethyl methylenediphosphonate in solution and in solid state

The crystal structure of UO22+ complex with tetraethyl methylenediphosphonate, CH2[P(O)(OCH2CH3)2]2, POPO, and its spectroscopic characterization in solution and in solid state are discussed. The complex was also characterized by CHN microanalytical procedures, infrared, absorption and luminescence spectroscopy and by single crystal X-ray diffraction. Uranyl in the [UO2(POPO)(NO3)2] complex is six-coordinated.

► We obtained and characterized uranyl complex of tetraethyl methylenediphosphonate. ► Structure of the complex was elucidated using CHN, thermal, IR and X-ray analysis. ► Uranyl in the UO2(CH2(P(O)(OCH2CH3)2)2)(NO3)2 complex is six-coordinated. ► The coordination of uranium ion is close to hexagonal bipyramid.