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124-43-6Relevant articles and documents
Kinetics of solid-phase H+/M+ ion exchange on hafnium hydrogen phosphate
Karavanova,Stenina,Yaroslavtsev
, p. 995 - 1001 (2009)
The kinetics of solid-phase reactions between hafnium hydrogen phosphate and alkali metal chlorides were studied by thermogravimetry with subsequent analysis of leaving gases. For sodium and potassium chlorides, the reaction occurs in two stages; the firs
Effects of P2O7 clusters arrangement on second harmonic generation responses of pyrophosphates
Wei, Ping,Chen, Wenqiang,Jing, Qun,Lee, Ming-Hsien,Chen, Zhaohui
, (2020)
Phosphates with rich structural diversities and novel physicochemical properties can be regarded as the indispensible sources of optical functional materials. Therefore, the extensive research has been performed to search the suitable nonlinear optical (NLO) materials and unveil the relationship among the crystal structures, properties and functions of phosphates system. Herein, two pyrophosphates, namely, Na4P2O7 and β-Ca2P2O7 have been obtained and characterized. Results show that the two title compounds can achieve the coexistence of deep-ultraviolet (UV) cutoff edges (2PO4 (KDP)). Besides, the positive roles of alkaline and alkaline earth metals with larger radii or higher ratios of M/P2O7 on SHG effects of pyrophosphates can be concluded. Theoretical analysis reveals that their NLO effects mainly originate from O-2p and P-2p orbitals near to the Fermi level. In addition, their thermal properties, infrared spectra and elemental analysis were also discussed.
Corbridge, D. E. C.,Tromans, F. R.
, p. 1101 - 1110 (1958)
Ionic conductivity and Raman investigations on the phase transformations of Na4P2O7
Gangadharan, Raje,Kalaiselvi, Jayaraman,Shanmukaraj, Devaraj,Palanivel, Balan,Mohan, Sriramulu,Murugan, Ramaswamy
, p. 95 - 100 (2002)
The ionic conductivity and thermo-Raman spectra of anhydrous sodium pyrophosphate Na4P2O7 were measured dynamically in the temperature range from 25 to 600 °C with a heating rate of 2 °C min-1 to understand the structural evolution and phase transformation involved. The DSC thermogram was also measured in the same thermal process for the phase transformation investigation. The spectral variations observed in the thermo-Raman investigation indicated the transformation of Na4P2O7 from low temperature phase (ε) to high temperature phase (α) proceeded through pre-transitional region from 75 to 410 °C before the major orientational disorder at 420 °C and minor structural modifications at 511, 540 and 560 °C. The activation energies and enthalpies of the proposed phase transformations were determined. The possible mechanism for temperature dependent conductivity in Na4P2O7 was discussed with the available data.
Phase relations and flux research for zinc oxide crystal growth in the ZnO-Na2O-P2O5 system
Ji,Li,Luo,Liang,Zhang,Liu,Rao
, p. 436 - 441 (2008)
The subsolidus phase relations of the ternary system ZnO-Na2O-P2O5 were investigated by means of X-ray diffraction (XRD). There are 7 binary compounds, 4 ternary compounds and 16 three-phase regions in this system. The pha
Monitoring dehydration and condensation processes of Na2HPO4 · 12H2O using thermo-Raman spectroscopy
Ghule, Anil,Bhongale, Chetan,Chang, Hua
, p. 1529 - 1539 (2003)
Thermal dehydration and condensation processes of disodium hydrogen phosphate dodecahydrate (Na2HPO4 · 12H2O) were monitored by thermo-Raman spectroscopy (TRS). Various hydrated forms Na2HPO4 · 12H2O, Na2HPO4 · 8H2O, Na2HPO4 · 7H2O, Na2HPO4 · 2H2O, Na2HPO4 · H2O and Na2HPO4 were observed, followed by condensation of Na2HPO4 to sodium pyrophosphate (Na4P2O7) in a dynamic thermal process. Representative Raman spectra of all the hydrated forms Na2HPO4 · 12H2O, Na2HPO4 · 8H2O, Na2HPO4 · 7H2O, Na2HPO4 · 2H2O, Na2HPO4 · H2O and Na2HPO4 were detected in both H2O and PO43- regions are reported. The thermo-Raman intensity (TRI) thermogram also showed systematic loss of water in five steps of dehydration, with the differential TRI thermogram in agreement shows five dips corresponding to the five steps of dehydration, respectively. Thermogravimetry (TG) and differential thermogravimetry (DTG) are in harmony with the results of TRS, though, the two could not resolve the steps involved.
Modified Pechini synthesis of Na3Ce(PO4) 2and thermochemistry of its phase transition
Matraszek, Aleksandra,Szczygiel, Irena
, p. 689 - 692 (2008)
Effect of the synthesis conditions of Pechini technique on crystallinity and purity of Na3Ce(PO4)2compound was investigated. Nano-sized cerium-sodium phosphate obtained when EDTA was used as an additional chelating agent f
Szustkiewicz, Wladyslawa
, p. 97 - 102 (1992)
Emsley, John,Niazi, Shahida
, p. 375 - 378 (1983)
17O solid-state NMR and first-principles calculations of sodium trimetaphosphate (Na3P3O9), tripolyphosphate (Na5P3O10), and pyrophosphate (Na 4P2O7)
Vasconcelos, Filipe,Cristol, Sylvain,Paul, Jean-Francois,Tricot, Gregory,Amoureux, Jean-Paul,Montagne, Lionel,Mauri, Francesco,Delevoye, Laurent
, p. 7327 - 7337 (2008)
The assignment of high-field (18.8 T) 17O MAS and 3QMAS spectra has been completed by use of first-principles calculations for three crystalline sodium phosphates, Na3P3O9, Na 5P3O10, and Na4P2O 7. In Na3P3O9, the calculated parameters, quadrupolar constant (CQ), quadrupolar asymmetry (ηQ), and the isotropic chemical shift (δcs) correspond to those deduced experimentally, and the calculation is mandatory to achieve a complete assignment. For the sodium tripolyphosphate Na 5P3O10, the situation is more complex because of the free rotation of the end-chain phosphate groups. The assignment obtained with ab initio calculations can however be confirmed by the 17O{ 31P} MAS-J-HMQC spectrum. Na4P2O7 17O MAS and 3QMAS spectra show a complex pattern in agreement with the computed NMR parameters, which indicate that all of the oxygens exhibit very similar values. These results are related to structural data to better understand the influence of the oxygen environment on the NMR parameters. The findings are used to interpret those results observed on a binary sodium phosphate glass.
Study of (31)P NMR Chemical Shift Tensors and Their Correlation to Molecular Structure
Un, Sun,Klein, Melvin P.
, p. 5119 - 5124 (1989)
The nature of the (31)P anisotropic chemical shift interaction is examined by using magic-angle sample spinning NMR.Linear correlations between the principal values of the (31)P chemical shift tensor, P-O bond lengths, and O-P-O bond angles are established.On the basis of a previously established correlation between P-O bond length and dp-pO ?-bond order, values of the (31)P chemical shift tensor elements were determined to be linearly related to dp-pO ?-bond order.Furthermore, from correlations between bond lengths and bond angles, it was concluded thatfor the phosphates reported in this study the ?- and ?-bond contributions to the (31)P chemical shift interaction are not independent of each other and, hence, cannot be separated into distinct terms.A review of other phosphoryl derivatives suggests that these observations may be general for other quadruply coordinated phosphorus compounds.
Efficient synthesis of 4-amino-2,6-dichloropyridine and its derivatives
Ma, Congming,Liu, Zuliang,Yao, Qizheng
, p. 251 - 254 (2016)
A facile synthetic route to an important intermediate 4-amino-2,6-dichloropyridine was developed. Oxidation of 2,6-dichloropyridine as a starting material gave pyridine N-oxide derivative which was subjected to nitration followed by reduction. Subsequent nitration of the product and nucleophilic displacement reaction were carried out to afford fully substituted energetic pyridine derivatives. Most of the synthetic reactions proceeded under mild conditions.
Lanthanide complexes of ethylenediaminotetramethylene-phosphonic acid
Princz,Szilagyi,Mogyorosi,Labadi
, p. 427 - 439 (2002)
Ethylenediaminotetramethylenephosphonic acid (EDTMP, H8L) was prepared and its complexes with some lanthanide ions (La, Eu, Gd and Sm) were isolated under various conditions. IR spectra and thermal stabilities of EDTMP and its complexes were studied. The experimental conditions of the preparation influence to the composition of the complexes were shown. In alkaline solution (pH=8) deprotonated (P(O)(O-)2), and in acidic solution (pH=3-4) deprotonated and partly protonated (P(O)(O-)(OH)) and non-protonated (P(O)(OH)2) phosphonic groups are present in the complexes. All the complexes contain coordinated water molecules. The complexes containing a protonated phosphonic group contain coordinated and hydrogen-bonded water molecules.
Polymerisation occurrence in the anodic oxidation of phosphite on a boron-doped diamond electrode
Petrucci, Elisabetta,Montanaro, Daniele,Merli, Carlo
, p. 4952 - 4957 (2008)
The electrogeneration of polymeric phosphorus compounds during the anodic oxidation of aqueous solutions of phosphites on a boron-doped diamond electrode has been studied. Although the main oxidation product is orthophosphate, the results indicate the simultaneous generation of short-chain and cyclic compounds containing two and three phosphorus atoms whose evolution has been followed by ion chromatography. The effect on the reaction yield of several operative parameters such as current density, pH, temperature and initial phosphite concentration has been investigated. Consistently with the data presented, a new process for the generation of polymeric phosphates is obtained.
Erragh, Fatima,Boukhari, Ali,Abraham, Francis,Elouadi, Brahim
, (1995)
Hill, O. F.,Audrieth, L. F.
, p. 690 - 696 (1950)
Laitinen, H. A.,Onstott, E. I.
, p. 4729 - 4733 (1950)
Kinetics of thermal decomposition of alkaline phosphates
Vlase,Vlase, Gabriela,Doca
, p. 207 - 210 (2005)
The thermal behavior of KH2PO4, NaH 2PO4 and Na2HPO4 under non-isothermal conditions using TG method with different heating rates was studied. The values of the reaction rate were processed by means of Friedman's differential-isoconversional method. A dependence of the activation energy vs. conversion was observed. Therefore a procedure based on the compensation effect (suggested by Budrugeac and Segal) was applied. A less speculative data processing protocol was offered by the non-parametric kinetics method suggested by Serra, Nomen and Sempere. Three steps were observed by non-isothermal heating: a dehydration, a dimerization and a polycondensation. The differences in the intimate reaction mechanism are determined by the initial number of water molecules.
Szuszkiewicz, Wladyslawa
, p. 71 - 76 (1992)
Chemo-Enzymatic Oxidative Rearrangement of Tertiary Allylic Alcohols: Synthetic Application and Integration into a Cascade Process
Brenna, Elisabetta,Crotti, Michele,De Pieri, Matteo,Gatti, Francesco G.,Manenti, Gabriele,Monti, Daniela
supporting information, p. 3677 - 3686 (2018/06/04)
A chemo-enzymatic catalytic system, comprised of Bobbitt's salt and laccase from Trametes versicolor, allowed the [1,3]-oxidative rearrangement of endocyclic allylic tertiary alcohols into the corresponding enones under an Oxygen atmosphere in aqueous media. The yields were in most cases quantitative, especially for the cyclopent-2-en-1-ol or the cyclohex-2-en-1-ol substrates without an electron withdrawing group (EWG) on the side chain. Transpositions of macrocyclic alkenols or tertiary alcohols bearing an EWG on the side chain were instead carried out in acetonitrile by using an immobilized laccase preparation. Dehydro-Jasmone, dehydro-Hedione, dehydro-Muscone and other fragrance precursors were directly prepared with this procedure, while a synthetic route was developed to easily transform a cyclopentenone derivative into trans-Magnolione and dehydro-Magnolione. The rearrangement of exocyclic allylic alcohols was tested as well, and a dynamic kinetic resolution was observed: α,β-unsaturated ketones with (E)-configuration and a high diastereomeric excess were synthesized. Finally, the 2,2,6,6-tetramethyl-1-piperidinium tetrafluoroborate (TEMPO+BF4?)/laccase catalysed oxidative rearrangement was combined with the ene-reductase/alcohol dehydrogenase cascade process in a one-pot three-step synthesis of cis or trans 3-methylcyclohexan-1-ol, in both cases with a high optical purity. (Figure presented.).