Solvent extraction and separation of zirconium, niobium and tantalum by 2-carbethoxy-5-hydroxy-1-(4-tolyl)-4-pyridone

Janko, M.; Herak, Mirta

doi:10.1007/bf01218332

Cited by 14 publications

(3 citation statements)

References 4 publications

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“…g . , gallium (II1) (1 7 , 18), iron(II1) (1 9-2 I), vanadium(V) (22-24), uranium(V1) (25), thorium(1V) (26), protactinium(V) (26), zirconium(1V) (27), niobium(V) (27), and tantalum(V) (27).…”

Section: Introductionmentioning

confidence: 99%

Physical and structural studies of N-carboxymethyl- and N-(p-methoxyphenyl)-3-hydroxy-2-methyl-4-pyridinone

Zhang¹,

Rettig²,

Orvig³

1992

Can. J. Chem.

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This paper is dedicated to the memory of Professor Thotnas BirchallZAIHUI ZHANG, STEVEN J. RETTIG, and CHRIS ORVIG. Can. J. Chem. 70, 763 (1992). 3-Hydroxy-I-carboxymethyl-2-methyl-4-pyridinone (Hcmp) and 3-hydroxy-I-(p-rnethoxypheny1)-2-methyl-4-pyridine (Hpap) have been prepared and studie! by single crystal X-ray diffraction. Crystals of Hcmp are monoclinic, a = 6.340 (2), b = 7.705 (I), c = 16.226 (1) A, P = 94.74 (I), Z = 4, space group P 2 , / n and those for Hpap are monoclinic, a = 10.8435 (9), b = 16.680 (2), c = 13.5665 (6) A, P = 109.450 (4), Z = 8, space group C 2 / c . Both structures were solved by direct methods and were refined by full-matrix least-squares procedures to R = 0.030 and 0.041 (R,, = 0.039 and 0.058) for 1642 and 1819 reflections with I 2 3u(I), respectively. Bond lengths and bond angles in the two compounds are normal; however, Hcmp forms as a zwitterion in the solld state. The two compounds were also studied by mass spectrometry, UV, infrared, proton NMR spectroscopies, and potentiometric equllibnum measurements. The protonation constants for Hcrnp are log Kl = 9.76 (I), log K2 = 3.43 (I), and log K, = 2.78 (3) and for Hpap are log K ; = 9.42 (4) and log K ; = 3.16 (8).Key words: 3-hydroxy-4-pyridinone, zwitterion, hydrogen bonding, protonation constant, crystallography, solid state. Introduction N-aryl (2) substituted-3-hydroxy-2-methyl-4-pyridinones and AS part of our project to examine the coordination themtheir metal complexes have been reported (7,8). he studistry and biochemical properties of aluminum, gallium, and ies have shown that these complexes have unique Properindium complexes, we have been studying tris(ligand) cornties: reasonable water solubility, variable lipophilicity, high plexes of these metal ions with 3-hydroxy-4-pyrones (1 -3) thermodynamic stability, and interesting biological activity and 3-hydroxy-4-pyridinones (4-7) as bidentate ligands. The (7, 9-1 1). preparation and characterization of a series of N-alkyl (1) and

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Section: Introductionmentioning

confidence: 99%

Physical and structural studies of N-carboxymethyl- and N-(p-methoxyphenyl)-3-hydroxy-2-methyl-4-pyridinone

Zhang¹,

Rettig²,

Orvig³

1992

Can. J. Chem.

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“…That means that most of the tested and developed separations were with zirconium and niobium in no-carrier-added (nca) forms. Separation strategies including precipitation [32,33] and a broad number of liquid-liquid extraction systems [34][35][36][37] for rapid separation were published. For the separation of bulk zirconium mass from no-carrier-added niobium, ion exchange chromatography seems to be most convenient strategy, where the small mass product can retain on the column and the bulk target mass can pass through.…”

Section: Introductionmentioning

confidence: 99%

Direct flow separation strategy, to isolate no-carrier-added⁹⁰Nb from irradiated Mo or Zr targets

et al. 2016

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90 Nb has an intermediate half-life of 14.6 h, a high positron branching of 53% and optimal + emission energy of only mean 0.35 MeV per decay. These favorable characteristics suggest it may be a potential candidate for application in immuno-PET. Our recent aim was to conduct studies on distribution coefficients for Zr IV and Nb V in mixtures of HCl/H 2 O 2 and HCl/oxalic acid for anion exchange resin (AG 1×8) and UTEVA resin to develop a "direct flow" separation strategy for 90 Nb. The direct flow concept refers to a separation accomplished using a single eluent on multiple columns, effectively streamlining the separation process and increasing the time efficiency. Finally, we also demonstrated that this separation strategy is applicable to the production of the positron emitter 90 Nb via the irradiation of molybdenum targets and isolation of 90 Nb from the irradiated molybdenum target.

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“…cloud point extraction, solid phase extraction (SPE), ion exchange, hydride generation, and chromatography (10)(11)(12)(13)(14)(15)(16). Among these techniques, SPE for the preconcentration and separation of trace elements has achieved increasing application because of its simplicity, speed, high enrichment factors, rapid phase separation, and ability to combine with different detection techniques.…”

Section: Introductionmentioning

confidence: 99%

Preconcentration and Separation of Trace As(III) and Sb(III) by Carbon Nanofibers Loaded With Ammonium Pyrroinedithiocarbamate Prior to ICP-MS Determination

Chen¹

2015

At.Spectrosc.

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Solvent extraction and separation of zirconium, niobium and tantalum by 2-carbethoxy-5-hydroxy-1-(4-tolyl)-4-pyridone

Cited by 14 publications

References 4 publications

Physical and structural studies of N-carboxymethyl- and N-(p-methoxyphenyl)-3-hydroxy-2-methyl-4-pyridinone

Physical and structural studies of N-carboxymethyl- and N-(p-methoxyphenyl)-3-hydroxy-2-methyl-4-pyridinone

Direct flow separation strategy, to isolate no-carrier-added⁹⁰Nb from irradiated Mo or Zr targets

Preconcentration and Separation of Trace As(III) and Sb(III) by Carbon Nanofibers Loaded With Ammonium Pyrroinedithiocarbamate Prior to ICP-MS Determination

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Solvent extraction and separation of zirconium, niobium and tantalum by 2-carbethoxy-5-hydroxy-1-(4-tolyl)-4-pyridone

Cited by 14 publications

References 4 publications

Physical and structural studies of N-carboxymethyl- and N-(p-methoxyphenyl)-3-hydroxy-2-methyl-4-pyridinone

Physical and structural studies of N-carboxymethyl- and N-(p-methoxyphenyl)-3-hydroxy-2-methyl-4-pyridinone

Direct flow separation strategy, to isolate no-carrier-added90Nb from irradiated Mo or Zr targets

Preconcentration and Separation of Trace As(III) and Sb(III) by Carbon Nanofibers Loaded With Ammonium Pyrroinedithiocarbamate Prior to ICP-MS Determination

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Direct flow separation strategy, to isolate no-carrier-added⁹⁰Nb from irradiated Mo or Zr targets