Crystal Structure of Pyridoxal Amino Methyl Phosphonic Acid (PYRAMPA) and Its Stability Constants with Al3+

2013 ◽  
Vol 1 ◽  
pp. 194308921350703
Author(s):  
Yahia Z. Hamada ◽  
Wesley R. Harris ◽  
Nigam P. Rath
Keyword(s):  
Crystal Structure ◽  
Aqueous Solutions ◽  
Stability Constants ◽  
Phosphonic Acid ◽  
High Stability ◽  
Deionized Water ◽  
Multidentate Ligand ◽  
Green Materials ◽  
Living Organisms ◽  
Very High

The crystal structure of the newly synthesized ligand pyridoxal amino methyl phosphonic acid (PYRAMPA) from green materials in deionized water and methanol is presented. It took only two steps to prepare this new ligand. The ligands’ stability constants with Al3+ are also reported in aqueous solutions at 25 °C ± 0.1 °C. The ligand was introduced as part of our concerted efforts to identify and synthesize an orally effective aluminum sequestering agent due to the known toxic effect of aluminum in living organisms particularly humans. PYRAMPA is a multidentate ligand suitable to sequester aluminum with very high stability.

Stability and catalytic properties of μ-oxo and μ-nitrido dimeric iron tetrasulfophthalocyanines in the oxidation of Orange II by tert-butylhydroperoxide

2014 ◽  
Vol 18 (07) ◽  
pp. 604-613 ◽  
Author(s):  
Anna S. Makarova ◽  
Evgeny V. Kudrik ◽  
Sergei V. Makarov ◽  
Oskar I. Koifman
Keyword(s):  
Catalytic Activity ◽  
Aqueous Solutions ◽  
Catalytic Oxidation ◽  
Organic Compounds ◽  
High Stability ◽  
Catalytic Properties ◽  
Orange Ii ◽  
Tert Butylhydroperoxide ◽  
Good Catalytic Activity ◽  
Very High

A study of catalytic activity of μ-nitrido- and μ-oxo-dimeric iron tetrasulfophthalocyanines in the oxidation of Orange II by tert-butylhydroperoxide in aqueous solutions has been performed. It is shown that though in one catalytic cycle activity of μ-oxo-dimer is higher, stability of this complex in oxidative conditions is poor. μ-nitrido-dimer combines relatively good catalytic activity with very high stability in the presence of tert-butylhydroperoxide. The mechanisms of oxidative decomposition of dimers and catalytic oxidation of Orange II have been proposed on the base of kinetic results. The products of catalytic processes are shown to be bio-degradable non-toxic small organic compounds.

scholarly journals Expanding the Scope of Pyclen-Picolinate Lanthanide Chelates to Po-Tential Theranostic Applications

2020 ◽  
Author(s):  
Gwladys Nizou ◽  
Chiara Favaretto ◽  
Francesca Borgna ◽  
Pascal V. Grundler ◽  
Nathalie Saffon-Merceron ◽  
...  
Keyword(s):  
Solid State ◽  
Dft Calculations ◽  
Stability Constants ◽  
High Stability ◽  
Lanthanide Ions ◽  
Lanthanide Chelates ◽  
The Stability ◽  
Theranostic Applications ◽  
First Time ◽  
Very High

A family of three picolinate pyclen based ligands, previously investigated for the complexation of Y<sup>3+</sup> and some lanthanide ions (Gd<sup>3+</sup>, Eu<sup>3+</sup>), was studied with <sup>161</sup>Tb and <sup>177</sup>Lu in view of potential radiotherapeutic applications. The set of six Tb<sup>3+ </sup>and Lu<sup>3+ </sup>complexes was synthesized and fully characterized. The coordination properties in the solid state and in solution were thoroughly studied. Potentiometric titrations, corroborated by DFT calculations, showed the very high stability constants of the Tb<sup>3+</sup> and Lu<sup>3+</sup> complexes, which are associated to remarkable kinetic inertness. A complete radiolabeling study performed with both<sup> 161</sup>Tb and <sup>177</sup>Lu radionuclides, including experiments with regard to the stability with and without scavengers and kinetic inertness using challenging agents, proved that the ligands could reasonably compete with the DOTA analogue. To conclude, the potential of using the same ligand for both radiotherapy and optical imaging was highlighted for the first time.

scholarly journals Expanding the Scope of Pyclen-Picolinate Lanthanide Chelates to Po-Tential Theranostic Applications

2020 ◽  
Author(s):  
Gwladys Nizou ◽  
Chiara Favaretto ◽  
Francesca Borgna ◽  
Pascal V. Grundler ◽  
Nathalie Saffon-Merceron ◽  
...  
Keyword(s):  
Solid State ◽  
Dft Calculations ◽  
Stability Constants ◽  
High Stability ◽  
Lanthanide Ions ◽  
Lanthanide Chelates ◽  
The Stability ◽  
Theranostic Applications ◽  
First Time ◽  
Very High

A family of three picolinate pyclen based ligands, previously investigated for the complexation of Y<sup>3+</sup> and some lanthanide ions (Gd<sup>3+</sup>, Eu<sup>3+</sup>), was studied with <sup>161</sup>Tb and <sup>177</sup>Lu in view of potential radiotherapeutic applications. The set of six Tb<sup>3+ </sup>and Lu<sup>3+ </sup>complexes was synthesized and fully characterized. The coordination properties in the solid state and in solution were thoroughly studied. Potentiometric titrations, corroborated by DFT calculations, showed the very high stability constants of the Tb<sup>3+</sup> and Lu<sup>3+</sup> complexes, which are associated to remarkable kinetic inertness. A complete radiolabeling study performed with both<sup> 161</sup>Tb and <sup>177</sup>Lu radionuclides, including experiments with regard to the stability with and without scavengers and kinetic inertness using challenging agents, proved that the ligands could reasonably compete with the DOTA analogue. To conclude, the potential of using the same ligand for both radiotherapy and optical imaging was highlighted for the first time.

The metachor as a characteristic of the association of electrolytes in aqueous solutions

1984 ◽  
Vol 49 (5) ◽  
pp. 1061-1078 ◽  
Author(s):  
Jiří Čeleda ◽  
Stanislav Škramovský
Keyword(s):  
Aqueous Solutions ◽  
Apparent Volume ◽  
Solutions Of Electrolytes ◽  
Molal Volumes ◽  
The Difference ◽  
High Concentrations ◽  
Experimental Values ◽  
Suitable Characteristic ◽  
Association Of Ions ◽  
Very High

Based on the earlier paper introducing a concept of the apparent parachor of a solute in the solution, we have eliminated in the present work algebraically the effect which is introduced into this quantity by the additivity of the apparent molal volumes. The difference remaining from the apparent parachor after substracting the contribution corresponding to the apparent volume ( for which the present authors suggest the name metachor) was evaluated from the experimental values of the surface tension of aqueous solutions for a set of 1,1-, 1,2- and 2,1-valent electrolytes. This difference showed to be independent of concentration up to the very high values of the order of units mol dm-3 but it was directly proportional to the number of the free charges (with a proportionality factor 5 ± 1 cm3 mol-1 identical for all studied electrolytes). The metachor can be, for this reason, a suitable characteristic for detection of the association of ions and formation of complexes in the solutions of electrolytes, up to high concentrations where other methods are failing.

Effect of solution acidity on the crystallization of polychromates in uranyl-bearing systems: synthesis and crystal structures of Rb2[(UO2)(Cr2O7)(NO3)2] and two new polymorphs of Rb2Cr3O10

2021 ◽  
Vol 236 (1-2) ◽  
pp. 11-21
Author(s):  
Evgeny V. Nazarchuk ◽  
Oleg I. Siidra ◽  
Dmitry O. Charkin ◽  
Stepan N. Kalmykov ◽  
Elena L. Kotova
Keyword(s):  
Crystal Structure ◽  
Aqueous Solutions ◽  
Crystal Structures ◽  
Hydrothermal Treatment ◽  
Ambient Conditions ◽  
Screw Axis ◽  
3D Framework ◽  
Solution Acidity

Abstract Three new rubidium polychromates, Rb2[(UO2)(Cr2O7)(NO3)2] (1), γ-Rb2Cr3O10 (2) and δ-Rb2Cr3O10 (3) were prepared by combination of hydrothermal treatment at 220 °C and evaporation of aqueous solutions under ambient conditions. Compound 1 is monoclinic, P 2 1 / c $P{2}_{1}/c$ , a = 13.6542(19), b = 19.698(3), c = 11.6984(17) Å, β = 114.326(2)°, V = 2867.0(7) Å3, R 1 = 0.040; 2 is hexagonal, P 6 3 / m $P{6}_{3}/m$ , a = 11.991(2), c = 12.828(3) Å, γ = 120°, V = 1597.3(5) Å3, R 1 = 0.031; 3 is monoclinic, P 2 1 / n $P{2}_{1}/n$ , a = 7.446(3), b = 18.194(6), c = 7.848(3) Å, β = 99.953(9)°, V = 1047.3(7) Å3, R 1 = 0.037. In the crystal structure of 1, UO8 bipyramids and NO3 groups share edges to form [(UO2)(NO3)2] species which share common corners with dichromate Cr2O7 groups producing novel type of uranyl dichromate chains [(UO2)(Cr2O7)(NO3)2]2−. In the structures of new Rb2Cr3O10 polymorphs, CrO4 tetrahedra share vertices to form Cr3O10 2− species. The trichromate groups are aligned along the 63 screw axis forming channels running in the ab plane in the structure of 2. The Rb cations reside between the channels and in their centers completing the structure. The trichromate anions are linked by the Rb+ cations into a 3D framework in the structure of 3. Effect of solution acidity on the crystallization of polychromates in uranyl-bearing systems is discussed.

Pyrene-containing conjugated organic microporous polymers for photocatalytic hydrogen evolution from water

2021 ◽  
Author(s):  
Mohamed Gamal Mohamed ◽  
Mohamed Hammad Elsayed ◽  
Ahmed M. Elewa ◽  
Ahmed F. M. EL-Mahdy ◽  
Cheng-Han Yang ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
High Stability ◽  
Photocatalytic Hydrogen Evolution ◽  
Microporous Polymers ◽  
Very High ◽  
Conjugated Microporous Polymers ◽  
Production Efficiencies

Pyrene based conjugated microporous polymers (CMPs) as photocatalysts with promising H2 production efficiencies and very high stability.

New laser-trimmed film resistor structures for very high stability requirements

1988 ◽  
Vol 35 (4) ◽  
pp. 516-518 ◽  
Author(s):  
J. Ramirez-Angulo ◽  
R.L. Geiger
Keyword(s):  
High Stability ◽  
Film Resistor ◽  
Very High

scholarly journals Strongly tricolor-emitting carbon dots synthesized by a combined aging–annealing route and their bio-application

RSC Advances ◽  
2017 ◽  
Vol 7 (80) ◽  
pp. 50802-50811 ◽  
Author(s):  
Ya Peng ◽  
Xinyan Zhou ◽  
Nannan Zheng ◽  
Lingyu Wang ◽  
Xingping Zhou
Keyword(s):  
Carbon Dots ◽  
High Stability ◽  
Fluorescence Probe ◽  
Cell Cytotoxicity ◽  
Very High

A novel way has been established to make the FCDs with a very high QY, high stability, low cell cytotoxicity, and outstanding performance as a fluorescence probe.

scholarly journals Orange opals from Buriti dos Montes, Piauí: solid inclusions as genetic guides

2015 ◽  
Vol 68 (1) ◽  
pp. 53-59 ◽  
Author(s):  
Gisele Tavares Marques ◽  
Marcondes Lima da Costa ◽  
Érico Rodrigues Gomes
Keyword(s):  
Chemical Composition ◽  
Aqueous Solutions ◽  
High Stability ◽  
Hydrothermal Fluids ◽  
Northeastern Brazil ◽  
Quartz Crystals ◽  
Hydrothermal Processes ◽  
Hydrothermal Environment

Orange opals from Buriti dos Montes (Piauí, northeastern Brazil) have gemological properties that favor their use as jewelry; these characteristics include their colors, transparency, relatively high stability and hardness. The exotic content of solid inclusions provides greater beauty to the opals of this region. These opals originated from hydrothermal processes and are found mainly as veinlets and veins in the sandstones of the Serra Grande Group, sectioned by diabase dikes and sills of the Sardinha Formation. Solid inclusions, such as bubbles, botryoidal aggregates, dendrites, and nodules, among others, consist mainly of kaolinite, hematite/goethite and quartz and influence the chemical composition of opals. Intense zoning of quartz crystals and high values of Ba and Fe suggest that opal deposits were formed in a hydrothermal environment. Diabase dykes could have been responsible for heating the hydrothermal fluids. Sandstones, rich in aqueous solutions, also contributed to the available silica for the saturation of these solutions, and fractures enabled the migration and entrapment of hydrothermal fluids, resulting in the mineralized veins.

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