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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

Published online by Cambridge University Press:  16 February 2011

P.S. Halasyamani ,
R.J. Francis ,
J.S. Bee  and
D. O'Hare
P.S. Halasyamani
Affiliation:
Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, Oxford, UK OX1 3QR
R.J. Francis
Affiliation:
Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, Oxford, UK OX1 3QR
J.S. Bee
Affiliation:
Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, Oxford, UK OX1 3QR
D. O'Hare
Affiliation:
Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, Oxford, UK OX1 3QR
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Abstract

The 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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 547: Symposium DD – Solid-State Chemistry of Inorganic Materials II , 1998 , 383
Copyright
Copyright © Materials Research Society 1999

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