Synthesis and structures of dioxouranium complexes with 2-pyridineformamide thiosemicarbazones

2-Pyridineformamide thiosemicarbazone (HL1) reacts with UO2(NO3)2 · 6H2O or [NBu4]2[UO2Cl4] under deprotonation and formation of neutral uranyl complexes. The composition of the products is dependent on the solvents used: [UO2(L1)(OH)]2 is formed when acetonitrile is used, whereas the hydrogen-bonded dimer [UO2(L1)(MeO)(MeOH)]2 is the product in methanol. Both products have been studied by X-ray crystallography showing uranium–uranium distances of 3.750 and 5.385 Å.