Hydrothermal Syntheses, Structures, and Fluorescence Spectroscopy of New One-Dimensional Uranium Oxyfluorides Built from Edge-Sharing [UO2F5] Pentagonal Bipyramids

Variable Dimensionality and New Uranium Oxide Topologies in the Alkaline-Earth Metal Uranyl Selenites AE[(UO2)(SeO3)2] (AE=Ca, Ba) and Sr[(UO2)(SeO3)2] · 2H2O

“…Fluorescence characterization of 1, 2, and 3 was performed as previously described (10,26). In summary, single crystals were placed onto a glass microscope slide and interrogated using a Nikon Eclipse E400 microscope with an epifluorescence attachment.…”

Organically Templated Zirconium Fluorides: Hydrothermal Syntheses, Structural Relationships, and Thermal Behavior of (C2H10N2)Zr2F10·H2O and (C4H12N2)ZrF6·H2O

“…We recently reported the successful application of dimensional reduction to the syntheses of one-dimensional (C H N)UO F from two-dimensional (C H N)U O F (7,8). In the case of eight-coordinate uranium and zirconium #uorides, one-dimensional chains formed from edge-sharing dodecahedra are quite common, and have been observed with both inorganic and organic cations (16, 17, 36}38).…”

“…Reactions were run in Parr 4749 23-ml autoclaves with PTFE liners. The naming system for these compounds stands for Auburn University, the dimensionality of the structure, and the compound number (6,8,9).…”

“…Our recent studies on the hydrothermal syntheses of organically templated low-dimensional U(IV) #uorides (6,8) and aquo#uorides (9) has prompted us to explore similar chemistry with Zr(IV) as has been accomplished in hightemperature solid-state reactions between UF or ZrF and alkali metal #uorides (18). Abrahams and coworkers have recently reported improved methods for isolating singlephase materials for several zirconium #uorides with known inorganic structural features (17).…”

“…AU2-6 consists of dodecahedral ZrF 8 units that share three edges with neighboring dodecahedra to form 2 R [Zr 2 F 10 ] 2؊ sheets that are separated by diprotonated ethylenediamine cations. AU1-6 contains edge-sharing ZrF 8 2؊ parent structure through the addition of one equivalent of 6uoride. Thermal analyses indicate that the water molecules in AU2-6 are more tightly bound than those in AU1-6 as endotherms corresponding to water loss occur at 226 and 1173C in AU2-6 and AU1-6, respectively.…”