scholarly journals Hydrolysis of Element (White) Phosphorus under the Action of Heterometallic Cubane-Type Cluster {Mo3PdS4}

Molecules ◽  
2021 ◽  
Vol 26 (3) ◽  
pp. 538
Author(s):  
Airat M. Kuchkaev ◽  
Nikita Y. Shmelev ◽  
Aidar M. Kuchkaev ◽  
Aleksandr V. Sukhov ◽  
Vasily M. Babaev ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Crucial Role ◽  
31P Nmr ◽  
Phosphorous Acid ◽  
Major Product ◽  
White Phosphorus ◽  
Cluster Complex ◽  
31P Nmr Spectroscopy ◽  
Hydrolysis Of

Reaction of heterometallic cubane-type cluster complexes—[Mo3{Pd(dba)}S4Cl3(dbbpy)3]PF6, [Mo3{Pd(tu)}S4Cl3(dbbpy)3]Cl and [Mo3{Pd(dba)}S4(acac)3(py)3]PF6, where dba—dibenzylideneacetone, dbbpy—4,4′-di-tert-butyl-2,2′-bipyridine, tu—thiourea, acac—acetylacetonate, py—pyridine, with white phosphorus (P4) in the presence of water leads to the formation of phosphorous acid H3PO3 as the major product. The crucial role of the Pd atom in the cluster core {Mo3PdS4} has been established in the hydrolytic activation of P4 molecule. The main intermediate of the process, the cluster complex [Mo3{PdP(OH)3}S4Cl3(dbbpy)3]+ with coordinated P(OH)3 molecule and phosphine PH3, have been detected by 31P NMR spectroscopy in the reaction mixture.

scholarly journals Selective Hydrolysis of Transferrin Promoted by Zr-Substituted Polyoxometalates

Molecules ◽  
2020 ◽  
Vol 25 (15) ◽  
pp. 3472
Author(s):  
Laura S. Van Rompuy ◽  
Nada D. Savić ◽  
Alvaro Rodriguez ◽  
Tatjana N. Parac-Vogt
Keyword(s):  
Nmr Spectroscopy ◽  
31P Nmr ◽  
Sodium Dodecyl ◽  
Tryptophan Fluorescence ◽  
31P Nmr Spectroscopy ◽  
Selective Hydrolysis ◽  
Buffer Solution ◽  
Structure Changes ◽  
Complementary Techniques ◽  
Hydrolysis Of

The hydrolysis of the iron-binding blood plasma glycoprotein transferrin (Tf) has been examined at pH = 7.4 in the presence of a series of Zr-substituted polyoxometalates (Zr-POMs) including Keggin (Et2NH2)10[Zr(PW11O39)2]∙7H2O (Zr-K 1:2), (Et2NH2)8[{α-PW11O39Zr-(μ-OH) (H2O)}2]∙7H2O (Zr-K 2:2), Wells-Dawson K15H[Zr(α2-P2W17O61)2]·25H2O (Zr-WD 1:2), Na14[Zr4(α-P2W16O59)2(μ3-O)2(μ-OH)2(H2O)4]·57H2O (Zr-WD 4:2) and Lindqvist (Me4N)2[ZrW5O18(H2O)3] (Zr-L 1:1), (nBu4N)6[(ZrW5O18(μ–OH))2]∙2H2O (Zr-L 2:2)) type POMs. Incubation of transferrin with Zr-POMs resulted in formation of 13 polypeptide fragments that were observed on sodium dodecyl sulfate poly(acrylamide) gel electrophoresis (SDS-PAGE), but the hydrolysis efficiency varied depending on the nature of Zr-POMs. Molecular interactions between Zr-POMs and transferrin were investigated by using a range of complementary techniques such as tryptophan fluorescence, circular dichroism (CD), 31P-NMR spectroscopy, in order to gain better understanding of different efficiency of investigated Zr-POMs. A tryptophan fluorescence quenching study revealed that the most reactive Zr-WD species show the strongest interaction toward transferrin. The CD results demonstrated that interaction of Zr-POMs and transferrin in buffer solution result in significant secondary structure changes. The speciation of Zr-POMs has been followed by 31P-NMR spectroscopy in the presence and absence of transferrin, providing insight into stability of the catalysts under reaction condition.

Role of the Vacuole in Metal Ion Trapping as Studied by in Vivo 31P-NMR Spectroscopy

1987 ◽  
pp. 349-359 ◽  
Author(s):  
Philip R. Pfeffer ◽  
Shu-I Tu ◽  
Walter V. Gerasimowicz ◽  
Richard T. Boswell
Keyword(s):  
Nmr Spectroscopy ◽  
Metal Ion ◽  
31P Nmr ◽  
Ion Trapping ◽  
31P Nmr Spectroscopy

scholarly journals Different reactivity of phosphorylallenes under the action of Brønsted or Lewis acids: a crucial role of involvement of the P=O group in intra- or intermolecular interactions at the formation of cationic intermediates

2019 ◽  
Vol 15 ◽  
pp. 1491-1504
Author(s):  
Stanislav V Lozovskiy ◽  
Alexander Yu Ivanov ◽  
Aleksander V Vasilyev
Keyword(s):  
Nmr Spectroscopy ◽  
Lewis Acid ◽  
Crucial Role ◽  
Lewis Acids ◽  
Phosphonic Acids ◽  
Phosphorus Containing ◽  
Allyl Alcohols ◽  
Hydrolysis Of ◽  
Allene System

3-Methylbuta-1,2-dien-1-ylphosphonic acid derivatives (phosphorylallenes) [X2(O=)P–CR=C=CMe2, X = Cl, OMe, NR2, or SAr] undergo intramolecular cyclization into the corresponding 1,2-oxaphospholium ions in the Brønsted superacid TfOH. These cations have been thoroughly studied by means of NMR spectroscopy. The hydrolysis of superacidic solutions of these species afforded cyclic phosphonic acids and other phosphorus-containing compounds. Contrary to Brønsted acids, 3-methylbuta-1,2-dien-1-ylphosphonic dichloride [Cl2(O=)P–HC=C=CMe2] reacted with the Lewis acid AlCl3 in an intermolecular way forming noncyclic intermediates, which were investigated by NMR spectroscopy and DFT calculations. Hydrolysis of these species resulted in the formation of phosphoryl-substituted allyl alcohols and 1,3-butadienes. A strong coordination of the oxygen of the P=O group with AlCl3 prevented the formation of cyclic 1,2-oxaphospholium ions and played a crucial role in the different reactivity of such phosphorylallenes under the action of Brønsted or Lewis acids. Apart from that, the reaction of dichlorophosphorylallenes with arenes and AlCl3 led to products of hydroarylation of the allene system, phosphoryl-substituted alkenes and/or indanes. This is the first example of a Lewis acid-promoted intermolecular hydroarylation of allenes bearing electron-withdrawing substituents. Plausible reaction mechanisms have been proposed on the basis of the investigated reactions, and NMR analysis and DFT studies of the intermediate cationic species.

scholarly journals Macrocyclic host cyclophosphazenes from aminolysis of N3P3CI6 by bis-(2-ortho-aminophenoxyethyl)ether

2009 ◽  
Vol 7 (1) ◽  
pp. 130-133 ◽  
Author(s):  
Abbas Tarassoli ◽  
Tahereh Sedaghat ◽  
Hamid-Reza Goudarzi
Keyword(s):  
Nmr Spectroscopy ◽  
Diethyl Ether ◽  
31P Nmr ◽  
New Products ◽  
Major Product ◽  
31P Nmr Spectroscopy ◽  
Water Interface ◽  
Experimental Conditions

AbstractAminolysis of N3P3CI6 by an oxodiamine, bis-(2-ortho-aminophenoxyethyl) ether, has been carried out under various experimental conditions and new products with different architectures have been obtained. The reaction in diethyl ether when using a Na2CO3-water interface process gives the mono-BINO as major product. Reaction on Al2O3/KOH leads to the spirocyclic compound, while, when the reaction is carried out in toluene in the presence of NEt3, a mixture of mono- and di-BINO products are obtained. These new products have been characterized by IR, 1H and 31P NMR spectroscopy.

Quantitative Determination of Krill Oil Composition by ATR-FTIR, NIR, and 31P NMR Spectroscopy

2020 ◽  
Author(s):  
Ashraf Ismail ◽  
Sanaz Molaye Moghaddam ◽  
Jean-Pierre MetabanzoulouSarya Aziz ◽  
Jacqueline Sedman ◽  
Mazen Bahadi
Keyword(s):  
Nmr Spectroscopy ◽  
Quantitative Determination ◽  
31P Nmr ◽  
31P Nmr Spectroscopy ◽  
Krill Oil ◽  
Oil Composition

Enzymatic decomposition of a locked nucleoside phosphoramidate monitored by 31P NMR spectroscopy

2014 ◽  
Author(s):  
Eliška Procházková ◽  
Hubert Hřebabecký ◽  
Radim Nencka ◽  
Martin Dračínský
Keyword(s):  
Nmr Spectroscopy ◽  
31P Nmr ◽  
31P Nmr Spectroscopy

scholarly journals Effect of Dietary Magnesium on Post Mortem Phosphocreatine Utilization in Skeletal Muscle of Swine: A Non-Invasive Study Using 31P-NMR Spectroscopy

1993 ◽  
Vol 34 (4) ◽  
pp. 397-404
Author(s):  
B. Moesgaard ◽  
I. Errebo Larsen ◽  
B. Quistorff ◽  
I. Therkelsen ◽  
V. Grøsfjeld Christensen ◽  
...  
Keyword(s):  
Skeletal Muscle ◽  
Nmr Spectroscopy ◽  
31P Nmr ◽  
31P Nmr Spectroscopy ◽  
Post Mortem ◽  
Non Invasive ◽  
Dietary Magnesium

Unravelling the dissolution mechanism of polyphosphate glasses by 31P NMR spectroscopy: ligand competition and reactivity of intermediate complexes

2021 ◽  
Author(s):  
Dahiana Andrea Avila Salazar ◽  
Peter Bellstedt ◽  
Atsuhiro Miura ◽  
Yuki Oi ◽  
Toshihiro Kasuga ◽  
...  
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Solid State ◽  
Nmr Spectroscopy ◽  
Biomedical Applications ◽  
Structural Changes ◽  
31P Nmr ◽  
Dissolution Mechanism ◽  
31P Nmr Spectroscopy ◽  
Glass Dissolution ◽  
Polyphosphate Glasses

Phosphate glass dissolution can be tailored via compositional and subsequent structural changes, which is of interest for biomedical applications such as therapeutic ion delivery. Here, solid-state 31P nuclear magnetic resonance...

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