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Materials Research Society, Materials Research Society Symposium Proceedings, (547), 1998

DOI: 10.1557/proc-547-383

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Variable Dimensionality in the Uranium Fluoride/2-Methyl-Piperazine System:  Syntheses and Structures of UFO-5, -6, and -7; Zero-, One-, and Two-Dimensional Materials with Unprecedented Topologies

Journal article published in 1999 by R. J. Francis, P. S. Halasyamani ORCID, J. S. Bee, D. O'Hare
This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Abstract

AbstractThe hydrothermal syntheses and structures of a new series of organically templated UIV materials are presented. The materials, UFO-5 (C5NH14)2(H3O)U2F13, UFO-6 (C5N2H14)2U2F12H2O and UFO-7 (C5N2H14)(H3O)U2F11, exhibit unprecedented topologies as well as represent 0-D (UFO-5), 1-D (UFO-6), and 2-D (UFO-7) phases. By systematic experimentation and utilizing a composition prism, wherein the reagents including H20 are graphically depicted. we have determined stability regions in which UFO-5, 6, and 7 can be synthesized as phase pure products. In addition, through pH measurements we observe a direct relationship between the acidity of the reaction and the dimensionality of the product. We suggest that the increased acidity facilitates condensation of the molecular uranium units in UFO-5. to produce the 1-D UFO-6 and at higher acidity the 2-D UFO-7.