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Enzyme
Compound
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Target Concepts:
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Query: EC:3.4.16.2 (
PCP
)
3,761
document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)
By varying solvent systems, the solvothermal treatment of uranyl nitrate and methylenediphosphonic acid (H
4
PCP
) afforded three new porous uranyl-organic frameworks (UOFs). All were structurally characterized by single-crystal X-ray diffraction and formulated as (Et
2
NH
2
)
2
[(UO
2
)
3
(
PCP
)
2
](H
2
O)
2.5
(1), (MeNH
3
)(H
3
O)[(UO
2
)
3
(
PCP
)
2
(H
2
O)
3
] (2), and [Na(H
2
O)
4
](H
3
O)[(UO
2
)
3
(
PCP
)
2
(H
2
O)
2
](H
2
O)
5
(3). These compounds crystallize with three-dimensional anionic frameworks containing U(VI) and distinct cationic species due to in situ solvent hydrolysis. The solvent systems
diethylformamide
(
DEF
), N-methyl-2-pyrrolindone (NMP), and the additive sodium vanadate (Na
3
VO
4
) significantly impact the resultant structures, affording diethyl ammonium, methyl ammonium, and sodium cations captured in channels of the anionic frameworks of 1-3. In 1, a trinuclear U
3
O
18
unit formed by three uranyl polyhedra that share edges is connected into a three-dimensional framework. Compound 2 has a three-dimensional framework formed from a uranyl-methylenediphosphonate layer that is pillared by UO
7
pentagonal bipyramids. With the inclusion of sodium cations, 3 is a porous framework containing UO
7
pentagonal bipyramids within a layer, with sodium cations and UO
6
square bipyramids linking the adjacent layers. Compounds 1-3 feature the uranyl/ligand ratio of 3:2, but present diverse structural building units ranging from edge-shared trinuclear to heteronuclear assemblies. The compounds have been characterized by infrared (IR), Raman, and UV-vis spectroscopies, X-ray diffraction, and thermogravimetric analysis.
...
PMID:Porous Uranium Diphosphonate Frameworks with Trinuclear Units Templated by Organic Ammonium Hydrolyzed from Amine Solvents. 2903 33
