Abstract
A series of uranyl complexes have been synthesized by reacting hexadentate ligands CH2[COO (CH2)nCAM; n=2, 3, 4]2 [CAM = 2,3-Ph(OH)2CONH] containing the catecholamide (CAM) group and β-diketonates framework with uranyl nitrate. They were characterized by FTIR, UV-vis, 1H NMR, XPS, TGA, and elemental analysis. The analysis revealed that oxygen atom of β-diketonate did not bind to uranyl ion in complexes 1–3. The photocatalytic degradation properties of the target complexes for degradation of rhodamine B (RhB) were investigated. The result indicated that approximately 74%, 71%, and 67% RhB were degraded in the presence of complexes 1–3 after about 210 min, respectively. Consequently, complexes 1–3 have excellent photocatalytic degradation property.
Highlights
IntroductionUranyl complexes have attracted much attention for exploring reactivity and coordination behavior of 5f -elements, developing suitable trivalent actinide (An(III)) extractants for nuclear remediation [1], screening highly effective chelators structure for decorporation of trivalent actinide (An(III)) [2], and investigating applications in the fields of catalysis, ion exchange, sensors, and photochemistry [3,4,5]
In recent years, uranyl complexes have attracted much attention for exploring reactivity and coordination behavior of 5f -elements, developing suitable trivalent actinide (An(III)) extractants for nuclear remediation [1], screening highly effective chelators structure for decorporation of trivalent actinide (An(III)) [2], and investigating applications in the fields of catalysis, ion exchange, sensors, and photochemistry [3,4,5].At present, a large number of uranyl complexes have been synthesized due to their diversified property
It was found that the π → π∗ and n → π∗ transitions of complexes were slightly red-shifted as compared to the π → π∗ and n → π∗ transitions of ligands H4L1–3 and had absorptions in the visible regions (380–450 nm), which was ascribed to charge transfer within the U=O double bonds and the ligand to metal charge transfer (LMCT) between the oxygen atoms of the coordinating ligands and the empty orbital of the uranyl ion [17,18,19]
Summary
Uranyl complexes have attracted much attention for exploring reactivity and coordination behavior of 5f -elements, developing suitable trivalent actinide (An(III)) extractants for nuclear remediation [1], screening highly effective chelators structure for decorporation of trivalent actinide (An(III)) [2], and investigating applications in the fields of catalysis, ion exchange, sensors, and photochemistry [3,4,5]. A large number of uranyl complexes have been synthesized due to their diversified property. The characteristics of organic ligands play a key role in formation process of the uranyl complexes. As an important chelator for decorporation of uranyl ion, catechol has the favorable stability constant [9, 10]. The β-diketonates catecholamide ligands (H4L1–3) have been reported as efficient uranyl sequestration agents in neutral pH aqueous media [6], but the detailed functional properties of their uranyl complexes have not been studied
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