The unit cells of some americium(III)—salts with organic anions

Weigel, F.; Meer, N. Ter

doi:10.1016/0020-1650(67)80094-1

Cited by 29 publications

(19 citation statements)

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“…The number of crystal water in lanthanide carbonates is reported as varying sensitively with temperature. For Am 2 (C0 3 ) 3 , the number of crystal waters known are 2 [27] and 4 [28],…”

Section: C0 2 Partial Pressure Of 10% and 100%mentioning

confidence: 99%

A Study of Solid-Liquid Phase Equilibria of Trivalent Lanthanide and Actinide Ions in Carbonate Systems

1992

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The solid-liquid phase equilibria of trivalent Nd, Eu and Am are investigated in carbonate systems of 0.1 M NaC10 4 under different C0 2 partial pressures of 0.03%, 1.0% and 100%. The solid phase produced by precipitation in the narrow pH range from 5 to 7 under each given C0 2 partial pressure is characterized for its chemical state by thermogravimetry in combination with differential thermal analysis, X-ray diffraction analysis and FTIR spectroscopy. Under 0.03% C0 2 partial pressure, the solid phase found is M0HC0 3 , while M 2 (C0 3 )3 is produced under 1.0% and 100% C0 2 partial pressure. The metal ion concentration at equilibrium with a given solid phase under controlled C0 2 partial pressure is analysed by spectroscopic speciation methods supported by ICP-AES for Nd and Eu and liquid scintillation counting for Am. The solubility products of hydroxocarbonates determined under 0.03% C0 2 partial pressure are: log A -,,, = -19.94± 0.16 forNd0HC0 3 , -20.18±0.09 for EuOHCOj and -18.70±0.12 for Am0HC0 3 . The solubility products of normal carbonates obtained under both C0 2 partial pressures of 1.0% and 100% are: logtf sf) = -31.35±0.12 for Nd 2 (C0 3 ) 3 , -31.78±0.22 for Eu 2 (C0 3 ) 3 and -29.45 ±0.18 for Am 2 (C0 3 ) 3 .

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“…The number of crystal water in lanthanide carbonates is reported as varying sensitively with temperature. For Am 2 (C0 3 ) 3 , the number of crystal waters known are 2 [27] and 4 [28],…”

Section: C0 2 Partial Pressure Of 10% and 100%mentioning

confidence: 99%

A Study of Solid-Liquid Phase Equilibria of Trivalent Lanthanide and Actinide Ions in Carbonate Systems

1992

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“…Thermogravimetric analysis of the precipitated binary compound suggests the formula Am 2 (CO 3 ) 3 · 2H 2 O (Weigel and ter Meer, 1967) or Am 2 (CO 3 ) 3 · 4H 2 O . The ternary compounds NaAm(CO 3 ) 2 · 4H 2 O and Na 3 Am(CO 3 ) 3 · 3H 2 O precipitate from 0.5 M NaHCO 3 and 1.5 M Na 2 CO 3 solutions, respectively .…”

Section: (E) Carbides and Carbonatesmentioning

confidence: 99%

“…Because of its importance for americium separation chemistry Am 2 (C 2 O 4 ) 3 · xH 2 O (Weigel and ter Meer, 1967) is the most important organic compound of americium. The pink solid precipitates from slightly acidic or neutral solutions of Am 3þ on addition of oxalic acid or alkali oxalate solution.…”

Section: (A) Oxalatementioning

confidence: 99%

“…The hydration number x was previously thought to vary with conditions of preparation and drying and values of 7 (Markin, 1958), 9 (Yakovlev and Kosyakov, 1958a), and 11 (Staritzky and Truitt, 1954 have been reported. Based on their X-ray diffraction studies and in analogy to Nd(III), Pu(III), and Cm(III), Weigel and ter Meer (1967) concluded that the hydration number x is 10. The decahydrate decomposes to the anhydrous form at 340 C through several hydrates and further decomposes to carbonate Am 2 (CO 3 ) 3 at about 430 C. The oxalate complexes with general formula MAm(C 2 O 4 ) 2 · xH 2 O have been prepared from Am(III) oxalate and M 2 C 2 O 4 (M ¼ NH 4 , Na, K, Cs) in neutral solution Krot, 1982, 1983a,b).…”

Section: (A) Oxalatementioning

confidence: 99%

“…Pink crystals of hexagonal Am(HCOO) · 0.2H 2 O form upon evaporation of a concentrated formic acid solution (Weigel and ter Meer, 1967). The formate decomposes at 300-350 C to AmO(HCOO), and at 400-500 C to the oxycarbonate Am 2 O 3 CO 3 , which forms at 520 C the sesquioxide Am 2 O 3 (Weigel and ter Meer, 1971).…”

Section: (B) Formatementioning

confidence: 99%

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Americium

Runde

Schulz

The Chemistry of the Actinide and Transactinide Elements

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Insight into the Structural and Emissive Behavior of a Three‐Dimensional Americium(III) Formate Coordination Polymer

Nicholas

Arteaga

Ducati

et al. 2023

Chemistry A European J

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We report the structural, vibrational, and optical properties of americium formate (Am(CHO 2 ) 3 ) crystals synthesized via the in situ hydrolysis of dimethylformamide (DMF). The coordination polymer features Am 3 + ions linked by formate ligands into a three-dimensional network that is isomorphous to several lanthanide analogs, (e. g., Eu 3 + , Nd 3 + , Tb 3 + ). Structure determination revealed a nine-coordinate Am 3 + metal center that features a unique local C 3v symmetry. The metal-ligand bonding interactions were investigated by vibrational spectroscopy, natural localized molecular orbital calculations, and the quantum theory of atoms in molecules. The results paint a predominantly ionic bond picture and suggest the metal-oxygen bonds increase in strength from NdÀ O < EuÀ O < AmÀ O. The optical properties were probed using diffuse reflectance and photoluminescence spectroscopies. Notably, the rarely reported 5 D 1' ! 7 F 0' emission band is observed and dominates the emission spectrum. This behavior is unusual and is attributed to the C 3v coordination environment of the metal center.

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The unit cells of some americium(III)—salts with organic anions

Cited by 29 publications

References 1 publication

A Study of Solid-Liquid Phase Equilibria of Trivalent Lanthanide and Actinide Ions in Carbonate Systems

A Study of Solid-Liquid Phase Equilibria of Trivalent Lanthanide and Actinide Ions in Carbonate Systems

Americium

Insight into the Structural and Emissive Behavior of a Three‐Dimensional Americium(III) Formate Coordination Polymer

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