Novel hydroxyl-functionalized 1,2,4-triazole-based oligomers: synthetic approach, photoluminescence and coordination behaviour as uranyl chelators
Тип публікації :
Препринт
Дата випуску :
23 березня 2026 р.
Автор(и) :
Dmytro M. Khomenko
Oleksandr V. Vashchenko
Roman O. Doroshchuk
Viktoriia S Starova
Mariia Hreben
Valerii Bukhanko
Andrii V. Yatsymyrskyi
Sergiu Shova
Olga Yu. Vassilyeva
Rostyslav D Lampeka
eKNUTSHIR URL :
Журнал :
ChemRxiv
Цитування :
[APA 7] Dmytro, M. K., Oleksandr, V. V., Roman, O. D., Viktoriia, S. S., Mariia, H., Valerii, B., Andrii, V. Y., Sergiu, S., Olga, Y. V., & Rostyslav, D. L. (2026). Novel hydroxyl-functionalized 1,2,4-triazole-based oligomers: synthetic approach, photoluminescence and coordination behaviour as uranyl chelators. ChemRxiv,. https://doi.org/10.26434/chemrxiv.15001160/v1
[ДСТУ] Novel hydroxyl-functionalized 1,2,4-triazole-based oligomers: synthetic approach, photoluminescence and coordination behaviour as uranyl chelators / M. K. Dmytro та ін. ChemRxiv. 2026. DOI: 10.26434/chemrxiv.15001160/v1 (дата звернення: 11.09.2026).
The management and recycling of accumulated depleted uranium may benefit from the development of novel organic heterocyclic systems that can be used as ligands for uranyl complexes in advanced materials. Although functionalised 1,2,4-triazoles have shown promise as ligand systems for a variety of transition metals, little is known about their coordination behaviour towards uranyl and the characteristics of the resultant complexes. In the present study, the synthetic strategy to construct functionalized oligo(1,2,4-triazoles) have been developed to prepare mono- ( H 2 L 1 ), bis- ( H 2 L 2 ) and tris-1,2,4-triazole-based oligomers ( H 2 L 3 ) bearing hydroxy-methyl and -phenyl substituents. Uranyl complexes [UO 2 (L 1 )(CH 3 OH)] 2 ·2CH 3 OH ( 1 ), [UO 2 (L 2 )] 2 ·4DMF ( 2 ) and [UO 2 (HL 3 )(CH 3 COO)]·CH 3 OH·H 2 O ( 3 ) were easily synthesized by combining UO 2 (CH 3 COO) 2 ∙2H 2 O with the ligand under suitable conditions. Two identical halves of the dinuclear molecules of 1 and 2 are bridged by two deprotonated alkoxy groups from the tri- and tetradentate ligands, respectively. In complex 3 , the pending hydroxymethyl group of ( HL 3 ) - stays protonated impeding dimerization of the molecule. Extensive N/O–H···O and C–H···N/O hydrogen bonding consolidates supramolecular 3D network structures of the uranyl complexes in the solid state. The behavior of the ligands and complexes in DMSO solution was investigated using 1 H NMR and 1 H DOSY NMR spectroscopy, complemented by DFT calculations. Under excitation with UV light (l ex = 310–311 nm), the ligands in solution give rise to strong broad bands centred at near 444 nm with Stokes shifts of ~133 nm. Photoluminescence quenching observed for 1 – 3 (1 x 10 -5 М, DMSO) as compared to the free ligands was rationalized with use of DFT calculations performed with ORCA 6.0.1 program package.
Якщо не вказано інше, ця робота розповсюджується на умовах ліцензії Attribution 4.0 International