The influence of pressure on the structure of a 2D uranium(VI) carboxyphosphonoate compound

Journal Article · Wed Oct 15 00:00:00 EDT 2014 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/J.JSSC.2014.05.026· OSTI ID:22443402

Spencer, Elinor C. ^[1]; Surbella, Robert G.; Cahill, Christopher L. ^[2]

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1. Dept. of Geosciences, Virginia Tech, Blacksburg, VA 24060 (United States)
2. Dept. of Chemistry, The George Washington University, 725 21st Street NW, Washington, DC 20052 (United States)

We report the first quantitative analysis of the structural evolution of a uranyl bearing coordination polymer in response to pressure. The material that is central to this study, (UO{sub 2})(O{sub 3}PCH{sub 2}CO{sub 2}H) (1), is constructed from rigid 2D inorganic layers comprising edge sharing UO{sub 7} pentagonal bipyramids cross-linked by [PO{sub 3}(COOH)]{sup 2−} anions. Strong hydrogen bonding interactions exist between the pendent carboxylic acid groups on adjacent layers. Under pressure, 1 exhibits compressional behaviour primarily in the direction perpendicular to the inorganic layers, which is aided by a reduction in the interlayer distance and shifting of the layers with respect to each other. The bulk modulus for the 2D compound 1 is unexpectedly high [18.1(1) GPa] and is within the range reported for 3D CPs assembled from Zn{sup II} cations and inflexible imidazolate anions, and is at the lower end of the range of moduli observed for aluminosilicate zeolites (19–59 GPa). - Graphical Abstract: The compression mechanism and elastic constants for a 2D Uranium(VI) carboxyphosphonoate compound are reported. - Highlights: • The response to pressure of a uranium carboxyphosphonoate compound has been studied. • High-pressure single-crystal XRD data for this 2D uranium compound were collected. • Elastic constants for this material have been determined. • The compression mechanism for the compound has been elucidated.

• OSTI ID: 22443402
• Journal Information: Journal of Solid State Chemistry, Vol. 218; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ANIONS
CARBOXYLIC ACIDS
CATIONS
COMPRESSION
HYBRIDIZATION
HYDROGEN
INTERACTIONS
MONOCRYSTALS
POLYMERS
PRESSURE RANGE MEGA PA 10-100
URANIUM
URANIUM DIOXIDE
X-RAY DIFFRACTION
ZEOLITES