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Updated: Jun 30, 2026

Syntheses, Crystallization, and Spectroscopic Characterization of 3,5-Lutidine N-Oxide Dehydrate
Published on: April 24, 2018
Uranyl Complexes with Hydroxybenzoates: Stability, Structure, and Effects of Hydroxyl Groups Quantity and Position
Olga I Logacheva1, Daniil N Yarullin1, Ilya S Roshchin1
1Research Institute of Thermodynamics and Kinetics of Chemical Processes, Ivanovo State University of Chemistry and Technology, Sheremetevskii pr. 7, Ivanovo 153000, Russia.
Abstract:
This paper reports stability constants for complexes formed between uranyl ions and benzoate, as well as 12 anions of various hydroxybenzoates, determined at T = 298.2 K, p = 0.1 MPa, and ionic strength I = 0.05 M (NaClO4). The relationship between the protolytic properties of the corresponding acids and complex stability is established through analysis of both our experimental data and literature values. A simple incremental approach quantifies the contribution of hydroxyl groups in ortho-, meta-, and para-positions to the stability constants. 13C NMR spectroscopy was employed to identify the functional groups of hydroxybenzoates participating in complexation. Additionally, the crystal structure of [UO2(2,6-DHBA)2(H2O)2]·1.5H2O was refined using X-ray diffraction analysis.
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