Abstract
Two uranyl vanadate heteropolyoxometalates (h-POMs) have been synthesized by ionothermal methods using the ionic liquid 1-ethyl-3-methylimidazolium diethyl phosphate (EMIm-Et2PO4). The hybrid actinide-transition metal shell structures have cores of (UO2)8(V6O22) and (UO2)6(V3O12), which we designate as {U8V6} and {U6V3}, respectively. The diethyl phosphate anions of the ionic liquids in some cases terminate the core structures to form actinyl oxide clusters, and in other cases the diethyl phosphate oxyanions link these cluster cores into extended structures. Three compounds exist for the {U8V6} cluster core: {U8V6}-monomer, {U8V6}-dimer, and {U8V6}-chain. Tungsten atoms can partially substitute for vanadium in the {U6V3} cluster, which results in a chain-based structure designated as {U6V3}-W. Each of these compounds contains charge-balancing EMIm cations from the ionic liquid. These compounds were characterized crystallographically, spectroscopically, and by mass spectrometry.
| Original language | English |
|---|---|
| Pages (from-to) | 3355-3364 |
| Number of pages | 10 |
| Journal | Inorganic Chemistry |
| Volume | 60 |
| Issue number | 5 |
| DOIs | |
| State | Published - Mar 1 2021 |
| Externally published | Yes |
Funding
This work is supported by the Department of Energy, Basic Energy Sciences, Heavy Elements Program under Grant DE-FG02-07ER15880. Single-crystal X-ray diffraction, powder X-ray diffraction, and Raman spectroscopic analyses were conducted at the Materials Characterization Facility of the Center of Sustainable Energy at the University of Notre Dame. X-ray fluorescence spectroscopy and CHN elemental analysis were conducted at the Center for Environmental Science and Technology at the University of Notre Dame. ESI-MS data workup was performed using the Molecular Weight Calculator provided by the Pacific Northwest National Laboratory through the OMICS.PNL.GOV website.