536-20-9Relevant articles and documents
Strong luminescence of novel water-soluble lanthanide complexes sensitized by pyridine-2,4,6-tricarboxylic acid
Ren, Yuan-Yuan,An, Bao-Li,Xu, Qian
, p. 42 - 46 (2010)
Sensitive biological analysis requires optical labels have good water solubility and excellent luminescent properties. Herein, two water-soluble lanthanide (Ln) complexes, Na6[Ln(PTA)3] (Ln = Eu and Tb), have been synthesized with a new tridentate ligand, pyridine-2,4,6- tricarboxylic acid (H3PTA). The twolanthanide complexes showed great characteristic emissions of Eu3+ and Tb3+ ions with high quantum yields of 54.3 ± 0.5% and 20.2 ± 0.2%, respectively. Moreover, they have good water solubility and can be labelled on biological molecules by dehydration reactions between the non-coordinated COOH groups from the luminescent complexes and the NH2 groups from the biological molecules.
Coordination polymers incorporating Bi(III) and 2,4,6-pyridine tricarboxylic acid and its derivatives: Synthesis, structure and topology
Linden, Anthony,Senior, Levi
, (2020)
Bi(III) as its oxide combined with 2,4,6-pyridine tricarboxylic acid, H2pdc-COOH, and various pyridine-derived additives in dimethylformamide (dmf) under solvothermal conditions produced three novel bismuth coordination polymers, {[Bi(μ-pdc-COO)2][NH2Me2]3}n, 1, {[Bi(μ-pdc-COO)2][C5H7N2]3·C5H6N2}n, 2, and {[Bi2(μ-pdc-COO)2(μ-pdc-COOH)(pdc-COOH)][NH2Me2]4·2dmf·NHMe2}n, 3. The anionic coordination network topologies are two-dimensional, chains-of-loops and ladders, respectively, but the local 8-coordinate environments about the bismuth(III) centres are in each case between that of a square antiprism and that of a hexagonal bipyramid. When the 4-carboxy substituent in H2pdc-COOH is replaced by another potentially coordinating substituent to give 4-R-2,6-pyridine dicarboxylic acid, H2pdc-R (R = OH, NH2, Cl), the salts obtained contain discrete centrosymmetric dinuclear 8-coordinate bismuth anions with either double O-bridges between the metal centres, [Bi2(μ-pdc-R)2(pdc-R)2(dmf)2][NH2Me2]2 (R = OH, NH2), 4 and 5, or double carboxylate bridges with one long Bi–O bond, [Bi2(μ-pdc-NMe2)2(pdc-NMe2)2(dmf)2][NH2Me2]2, 6 (R = Cl, but replaced by dimethylamine during the reaction). The structures and supramolecular networks of 1–6 are described and compared as an exploration of alternatives to the conventional carboxylate-based organic linking units.
Bismuth Coordination Polymers with 2,4,6-Pyridine Tricarboxylic Acid: High-Throughput Investigations, Crystal Structures and Luminescence Properties
Rhauderwiek, Timo,dos Santos Cunha, César,Terraschke, Huayna,Stock, Norbert
, p. 3232 - 3240 (2018)
Four new coordination polymers (CPs) were obtained under hydrothermal reaction conditions using 2,4,6-pyridinetricarboxylic acid (H3PTC) and Bi(NO3)3·5H2O. The systematic high-throughput investigation of the system Bi3+/H3PTC/NaOH/HNO3/H2O led to the compounds [Bi(PTC)(H2O)2] (1), (H3O)[Bi2(PTC)(HPTC)2(H2O)2] (2), α-[Bi(PTC)] (3) and β-[Bi(PTC)] (4), which were structurally characterised by single-crystal X-ray diffraction. Compounds 1 and 2 crystallise in 2D layered structures, whereas 3 and 4 form 3D coordination networks. Employing the nomenclature proposed by Cheetham et al. 1 and 2 are classified as I1O1 (mixed inorganic–organic layers), 3 as I0O3 (3D coordination polymers) and 4 as I1O2 (mixed inorganic–organic 3D framework). In all cases the nitrogen atom of the linker is coordinated to the Bi3+ ion, which therefore acts as a tridentate pincer-type ligand. All title compounds were obtained as phase-pure products employing conventional or microwave-assisted heating, but the reproducibility of the synthesis depends on reactor size and material. In addition, the luminescence properties of 1 and 2 were studied resulting in a yellow and blue–green luminescence under UV light with emission maxima at 570 nm (λex = 343 nm) and 483 nm (λex = 347 nm) for 1 and 2, respectively. The differences in the spectroscopic properties could be assigned to the distinct coordination and chemical environments of the Bi3+ ions within these compounds.
A fluorescent chemosensor for Hg(II) optical recognition: Mesoporous MCM-41 functionalized with a covalently linked Eu(III) complex
Zhao, Xiaojuan,Ye, Yun,Yue, Xiu,Ye, Xiuya,Wang, Qiaoyun,Li, Ruimin
, (2021/11/16)
Mercury widely spreads in atmosphere, lithosphere, and surface water. Concentrated mercury levels could be harmful for individuals with neurological diseases because of bioaccumulation of mercury within brains and kidneys. Mercury is thus considered to be a very dangerous element by the United States Environmental Protection Agency due to the severe immunotoxic, genotoxic, and neurotoxic effects. Consequently, the detection of mercury ions is an important issue for environment and human health. An easily synthesized Eu(III) complex of Eu(PTA) is covalently grafted to the ordered functionalized mesoporous MCM-41 backbone, hoping to explore a novel fluorescence chemosensor with high sensitivity and selectivity for Hg(II) detection in aqueous solution. Fourier transform IR, Small-angle X-ray diffraction, High-Resolution TEM, Nitrogen adsorption/desorption, UV-vis absorption and emission have been employed to characterize the organically modified mesoporous material. The Eu-MCM-41 based chemosensor exhibits a high selectivity for Hg(II), and has a good linearity within the range of 1–12 μmol/L in aqueous solution, suggesting the possibility for real-time qualitative or quantitative detection of Hg(II), as well as a wide potential application in environmental monitoring. The recognition of Hg(II) in actual samples from different sources has been examined by this chemosensor. Additionally, the sensing mechanism of Eu-MCM-41 based chemosensor towards Hg(II) is also investigated and discussed in detail.
