Characterization of iron and rare-earth polymers of di(2-ethylhexyl)phosphoric acid

Harada, Takeo; Smutz, Morton; Bautista, Renato G.

doi:10.1021/je60053a052

Cited by 32 publications

(13 citation statements)

References 4 publications

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“…1 and a slope of 0.46 was obtained, also indicating that mononuclear species is not extracted into the organic phase since due to the formation of mononuclear species one slope is obtained [11]. Polymerization observed for the extraction of yttrium and lanthanides was reported [1,[12][13][14].…”

Section: Resultsmentioning

confidence: 95%

Extraction mechanism of Gd3+ by BTMPPA

Bari

Saad

Rahman

et al. 2007

Journal of Alloys and Compounds

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Section: Resultsmentioning

confidence: 95%

Extraction mechanism of Gd3+ by BTMPPA

Bari

Saad

Rahman

et al. 2007

Journal of Alloys and Compounds

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“…The method serves to identify certain groups, containing hydrogen and carbon, in organic molecules. [8] In the present work, 1 H, 13 C, and 31 P NMR spectra were recorded in dimethylsulfoxide-d 6 (DMSO-d 6 ). The used instrument was a Bruker Avance 400 Digital FT-NMR spectrometer with a dual-probe head ( 1 H: 400 MHz, 13 C: 100 MHz, and 31 P: 162 MHz).…”

Section: B the Nmr Spectroscopymentioning

confidence: 99%

“…The obtained X-ray diffraction pattern is nearly identical to those given in the literature. [13,14] Two samples were investigated with NMR spectroscopy: one of pure DEHPA and the other of Nd(DEHP) 3 powder prepared from the gelatinous material. The DEHPA monomer and the Nd(DEHP) 3 powder are assumed to have the molecular structures depicted in Figure 7.…”

Section: Nmr Spectroscopic Investigation Of a Sample Prepared Fromentioning

confidence: 99%

“…Also, isotopes of carbon ( 12 C, 98.9 pct; and13 C, 1.1 pct), hydrogen ( 1 H, 99.98 pct; and 2 H, 0.02 pct) and oxygen ( 16 O, 99.76 pct; 17 O, 0.04 pct; and 18 O, 0.20 pct) may cause additional peaks. Thus, the identification of a neodymium-containing species is unambiguously possible by comparison of the measured series of peaks with the series of peaks corresponding to the Fig.…”

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confidence: 99%

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Investigation of the structure of neodymium-di-(2-ethylhexyl) phosphoric acid combinations using electrospray ionization and matrix-assisted laser desorption ionization mass spectrometry and nuclear magnetic resonance spectroscopy

Scharf

Ditze

Schwerdtfeger

et al. 2005

Metall Mater Trans B

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Neodymium-di-(2-ethylhexyl) phosphoric acid (DEHPA) species forming in the organic phase during solvent extraction of neodymium with solutions of DEHPA have been studied. Two samples were prepared: one with a low molar ratio of neodymium to DEHPA, which is liquid and clear, and the other with a high molar ratio of neodymium to DEHPA (complete loading), which has the consistency of a gel. Electrospray ionization (ESI) and matrix-assisted laser desorption ionization (MALDI) mass spectrometric investigations show numerous compounds, in addition to the generally assumed species dimeric DEHPA and Nd(DEHPиDEHPA) 3 , in the liquid sample. The nuclear magnetic resonance (NMR) spectroscopic investigation of pure DEHPA and of a completely loaded sample confirm the formula of pure DEHPA and of the organic part of Nd(DEHP) 3 . Furthermore, chemical analysis of a dried, completely loaded sample also proves the existence of the species Nd(DEHP) 3 . Results of X-ray powder diffraction measurements of this sample agree well with literature data.

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“…The corresponding IR spectra [2,3] and X-ray powder diffractograms [4] have been published. Investigation of the relevant crystal structures is still in progress [5,6].…”

Section: Introductionmentioning

confidence: 99%

Thermochemical behaviour of lanthanum complexes of 2-ethylhexyl phosphoric acid

Milanova

Todorovsky

Arnaudov

1996

Journal of Thermal Analysis

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The thermochemical behaviour of solid-state complexes of lanthanum with mono-(2-ethylhexyl) phosphoric acid (H2B) (La(HB)yl.5H20 and La2By3H20) was studied. The thermal decomposition of these complexes proceeds without melting to yield La(PO3)3 and a mixture of La(PO3)3 and LaPO4, respectively. La(HB)yl.5HzO decomposes via dehydration (323-383 K), condensation of the OH-groups with formation of a diphosphate structure (383-458 K) and a stepwise degradation of the hydrocarbon chains (443-565 K). The dehydration of LazBy3H20 (333-433 K) is followed by decomposition of the hydrocarbon group. From a combination of the present results with previous data [1], it was concluded that the temperatures and mechanisms of the decomposition of the hydrocarbon part of the lanthanide complexes of (2-ethylhexyl) phosphoric acids depend on the nature of the lanthanide, the atmosphere, and the structure of the complexes.

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Characterization of iron and rare-earth polymers of di(2-ethylhexyl)phosphoric acid

Cited by 32 publications

References 4 publications

Extraction mechanism of Gd3+ by BTMPPA

Extraction mechanism of Gd3+ by BTMPPA

Investigation of the structure of neodymium-di-(2-ethylhexyl) phosphoric acid combinations using electrospray ionization and matrix-assisted laser desorption ionization mass spectrometry and nuclear magnetic resonance spectroscopy

Thermochemical behaviour of lanthanum complexes of 2-ethylhexyl phosphoric acid

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