An X-ray diffraction study of Rb[UO2(SeO4)F]·H2O

Design and synthesis of coordination polymers with Cu(ii) and heterocyclic N-oxides

“…Consequently, the functionalized ligands occupy more space around the coordination center that can be seen from the comparison of the average ligand solid angles in the coordination sphere of the metal Ω( L1 − ) < Ω( L2 − ) < Ω( L3 − ) (Table 1). 56,57 As a result, compounds 4 and 5 have only bidentate μ-bridging ligands L2 − and L3 − . At the same time, L1 − and L2 − in compounds 1–3 share the coordination sphere of Cu( ii ) with other small polar co-ligands (H 2 O, HCO 2 − , and CH 3 CO 2 − ).…”

“…Consequently, the functionalized ligands occupy more space around the coordination center that can be seen from the comparison of the average ligand solid angles in the coordination sphere of the metal Ω(L1 − ) < Ω(L2 − ) < Ω(L3 − ) (Table 1). 56,57 As a result, compounds − was able to compete with small L1 − in compound 2, and it was unable to compete with larger L2 − in compound 4. The small sizes of L1 − and L2 − enable their O-atoms to be coordinated to CuIJII) ions in the κ 2 mode that leads to the formation of binuclear clusters in compounds 1 and 3 or the trinuclear cluster in compound 2 (Fig.…”

Insight into the Uranyl Oxyfluoride Topologies through the Synthesis, Crystal Structure, and Evidence of a New Oxyfluoride Layer in [(UO2)4F13][Sr3(H2O)8](NO3)·H2O

“…Up to now this building block has only been observed in organic templated structures. ,, When the chains are obtained with an inorganic cation and/or ammonium, the UO 2 F 5 entities are linked by sharing alternatively corners and edges, seemingly U 2 O 4 F 8 dimers linked by corners. − With a lower fluorine-to-oxygen ratio (F/O = 0.2), the structures are most likely to be constituted of chains of corner-sharing UO 5 F 2 polyhedra, linked by the fluorine atoms. This type of chain is the most common found in systems where oxoanions such as sulfates, selenates or phosphates are present in the coordination of uranium and where the countercation is inorganic or ammonium. − As obtained in this study and in a previous organically templated compound, chains are built from a tetrameric structural unit in which four UO 2 F 5 polyhedra are connected by corner sharing, which are further connected by edge-sharing . When an organic template is present, these chains are organized in a purely 1D structure, whereas in the title compound, a pseudo two-dimensional (2D) layered structure is observed.…”