Syntheses, structures and properties of uranyl oxalate complexes templated by amines

Abstract

[C₅H₁₄N₂][(UO₂)₂(C₂O₄)₃(H₂O)]·3H₂O·CO (NMPZ 1#) and [C₅H₁₄N₂][UO₂ (C₂O₄)_3/2(H₂O)][NO₃]·H₂O (NMPZ 2#) were synthesized by volatile method at room temperature using N-methylpiperazine as templates. The structures and optical properties were characterized by combination of single-crystal X-ray diffraction, PXRD, TG-DSC, IR, UV-Vis and fluorescence techniques. The single crystal structure results show that NMPZ 1# is a monoclinic crystal system, P2₁/n space group while NMPZ 2# is a triclinic crystal system, P-1 space group. Interestingly, NMPZ 1# has the following special properties and applications. According to the results of fluorescence experiment, NMPZ 1# shows fluorescence attenuation with time increasing, which make it have a potential application as a fluorescent sensor material. CO gas could escape from the lattice of NMPZ 1# under UV-light, which demonstrates the potential application of NMPZ 1# as a CO gas reservoir. Overall, this study confirms the close relationship between the properties of uranyl oxalate complexes and amine templates; such structures could provide a reference for relevant research.

Graphical Abstract

Keywords:

• Protonated amine
• template
• uranyl oxalate
• fluorescence
• gas storage

Acknowledgement

The authors wish to thank Xueling Qiao for the helpful guidance to analyze crystal structures.

Disclosure statement

The authors promise that there is no conflict of interest.

Additional information

Funding

Funding for this research was supported by the Central Universities (lzujbky-2019-12, lzujbky-2019-kb06).