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.
Investigation of the preparation and reactivity of metal-organic frameworks of cerium and pyridine-2,4,6-tricarboxylate
Clarkson, Guy J.,Fonseca de Lima, Juliana,Franklin, Sian A.,Menezes, Bruno A. T.,Moreno, Fernanda V. S.,Serra, Osvaldo A.,Waddington, Matthew C.,Walker, Marc,Walton, Richard I.,da Silva Barbosa, Jader
, p. 145 - 155 (2021/12/27)
The synthesis of three coordination polymers of cerium(iii) and the ligand pyridine-2,4,6-tricarboxylate (PTC) is reported. Two of the materials crystallise under hydrothermal conditions at 180 °C, with [Ce(PTC)(H2O)2]·1.5H2O, (1), being formed on extended periods of reaction time, 3 days or longer, and Ce(PTC)(H2O)3, (2), crystallising after 1 day. Both phases contain Ce(iii) but are prepared using the Ce(iv) salt Ce(SO4)2·4H2O as reagent. Under solvothermal conditions (mixed water-N,N-dimethylformamide (DMF)), the phase [Ce(PTC)(H2O)(DMF)]·H2O (3) is crystallised. The structures of the three materials are resolved by single crystal X-ray diffraction, with the phase purity of the samples determined by powder X-ray diffraction and thermogravimetric analysis. (1) is constructed from helical chains cross-linked by the PTC linkers to give a three-dimensional structure that contains clusters of water molecules in channels that are hydrogen-bonded to each other and to additional waters that are coordinated to cerium. (2) also contains nine-coordinate cerium but these are linked to give a dense framework, in which water is directly coordinated to cerium. (3) contains corner-shared nine-coordinate cerium centres, linked to give a framework in which Ce-coordinated DMF fills space. Upon heating the material (1) in air all water is irreversibly lost to give a poorly crystalline anhydrous phase Ce(PTC), as deduced from X-ray thermodiffractometry and thermogravimetric analysis. The material (1), however, is hydrothermally stable, and is also stable under oxidising conditions, where immersion in 30% H2O2gives no loss in crystallinity. Oxidation of around 50% of surface Ce to the +4 oxidation state is thus possible, as evidenced by X-ray photoelectron spectroscopy, which is accompanied by a colour change from yellow to orange. Photocatalytic activity of (1) is screened and the material shows effective degradation of methyl orange.
