Journal
DALTON TRANSACTIONS
Volume 45, Issue 39, Pages 15464-15472Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6dt03299k
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Funding
- National Science Foundation of China [91326112, 21422704, 21471107, 41303006, U1532259]
- Science Foundation of Jiangsu Province [BK20140007, BK20140303]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Jiangsu Provincial Key Laboratory of Radiation Medicine and Protection
- Young Thousand Talented Program in China
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Heavy Elements Chemistry Program [DE-FG02-13ER16414]
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The equatorial coordination nature of the uranyl unit has resulted in only three uranyl borate 3D framework compounds reported so far formed from boric acid flux reactions conducted at 190 degrees C while all others are 2D layers. Here in this work, by increasing the reaction temperature to 250 degrees C, a new potassium uranyl borate K[(UO2)B6O10(OH)] (KUBO-4) framework compound is synthesized that shares the same layer topology with the previously reported 2D layered KUBO-1. The 3D structure of KUBO-4 is achieved by interlayer hydroborate condensation. The KUBO-4 was further characterized with single crystal XRD, SHG and fluorescence spectra, and TG/DSC measurements. A deep understanding regarding the dissolution behaviours of uranyl borate is achieved via solubility studies of the KUBO-1 and KUBO-4 performed using a combination of ICP-MS, powder XRD, and fluorescence spectroscopy techniques. The results confirm the lack of stability of borates in aqueous solutions with the presence of coordinating ligands in the environment regardless of the structure types.
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