Synthesis and structure of the 1:1 uranyl nitrate tetrahydrate-18-crown-6 compound, UO/sub 2/(NO/sub 3/)/sub 2/(H/sub 2/O)/sub 2/. 2H/sub 2/O. (18-crown-6). Noncoordination of uranyl by the crown ether

Journal Article · Fri Oct 01 04:00:00 EDT 1976 · Inorg. Chem.; (United States)

DOI:https://doi.org/10.1021/ic50164a026· OSTI ID:7234445

Eller, P G; Penneman, R A

The synthesis and crystal structure of UO/sub 2/(NO/sub 3/)/sub 2/(H/sub 2/O)/sub 2/.2H/sub 2/O.(18-crown-6), which forms from the reaction of uranyl nitrate hexahydrate and the cyclic polyether 18-crown-6, are reported. The uranyl group is not located within the crown ether group. Rather, the structure consists of neutral UO/sub 2/(NO/sub 3/)/sub 2/(H/sub 2/O)/sub 2/ units and separate crown ether molecules connected by hydrogen bonding through intermediary water molecules. The oxygens of the linear uranyl group are coordinated only to uranium; the eight-coordination of uranium is completed by six equatorial oxygen donors, two from waters and two from symmetrically bidentate nitrates. The uranium and the six equatorial oxygens are coplanar within 0.06 A. Pertinent distances are U-O(uranyl) = 1.693 (6) A, U-O(water) = 2.434 (5) A, U-O(nitrate) = 2.482 (6) and 2.486 (6) A. The cyclic ether molecule exists in the customary crown conformation with normal distances and angles. Crystal data are as follows: space group Pl, Z = 1, a = 7.526 (7) A, b = 11.27 (1) A, c = 7.802 (4) A, ..cap alpha.. = 97.51 (6)/sup 0/, ..beta.. = 93.22 (6)/sup 0/, ..gamma.. = 105.95 (6)/sup 0/, R/sub F/ = 0.058 for 2453 diffractometer-collected reflections with I greater than or equal to 3sigma(I).

• Research Organization: Los Alamos Scientific Lab., NM
• OSTI ID: 7234445
• Journal Information: Inorg. Chem.; (United States), Journal Name: Inorg. Chem.; (United States) Vol. 15:10; ISSN INOCA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400301 -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
400702* -- Radiochemistry & Nuclear Chemistry-- Properties of Radioactive Materials
ACTINIDE COMPLEXES
ACTINIDE COMPOUNDS
BOND ANGLE
BOND LENGTHS
CHEMICAL PREPARATION
CHEMICAL REACTIONS
COHERENT SCATTERING
COMPLEXES
CRYSTAL STRUCTURE
DIFFRACTION
ETHERS
HYDRATES
HYDRATION
NITRATES
NITROGEN COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OXYGEN COMPOUNDS
SCATTERING
SOLVATION
STEREOCHEMISTRY
SYNTHESIS
URANIUM COMPLEXES
URANIUM COMPOUNDS
URANYL COMPLEXES
URANYL COMPOUNDS
URANYL NITRATES
X-RAY DIFFRACTION