A new uranyl carboxylate constructed from a semi-rigid tetracarboxylic acid ligand containing two iminodiacetic acid moieties and four methyl groups

Abstract

One new uranyl tetracarboxylate, [UO₂(H₂L³)(H₂O)]·3H₂O, was synthesized hydrothermally from a methyl group decorated semi-rigid tetracarboxylic acid ligand and systematically characterized using powder and single-crystal X-ray diffraction, IR, EA, TGA, and luminescent methods. The four carboxylate groups in the carboxylic ligand were all monodentate bridging and the uranyl cations are linked by tetracarboxylic ligands to form a two-dimensional layered crystal structure. Introduction of methyl groups has a large effect on the speciation of uranyl carboxylates. The thermal behavior and luminescent properties are also investigated.

Graphical Abstract

Keywords:

• Uranyl
• carboxylate
• crystal structure
• semi-rigid
• luminescence

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

The authors are grateful for the financial support from Qingdao Science and Technology Program (No. 19-6-1-43-nsh), Key Research and Development Program of Shandong Province (2019GSF107074), and Advanced Talents Foundation of Qingdao Agricultural University.