Draft:Neptunyl carbonates

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Last edited by UnbihexiumFan (talk | contribs) 7 days ago. (Update)

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Neptunyl carbonates are compounds containing neptunyl (NpO^+x
₂) and carbonate ions, such as NpO₂CO₃. Frequently, these compounds will also include alkali metal or alkaline earth metal ions, such as NaNpO₂CO₃·3.5 H₂O. These compounds often contain sheets made up of neptunyl and carbonate.^[1] Due to the abundance of carbonate in natural water, they are relevant for disposal of neptunium in nuclear waste.^[2]

Neptunyl(V) carbonates

Binary carbonates

NpO₂HCO₃?^[3]
- Reported but dubious

Mixed carbonates

KNpO₂CO₃^[1]^[2]
- consists of NpO+2-CO2−3 sheets and lone potassium ions^[1]
- each neptunyl is coordinated to three carbonates and each carbonate is coordinated to three neptunyls^[2]
NH₄NpO₂CO₃^[2]
- Isostructural with KNpO₂CO₃^[2]
- More stable with respect to neptunyl(V) hydroxide complexes in concentrated ammonium carbonate solution^[2]
RbNpO₂CO₃, CsNpO₂CO₃^[2]
- Isostructural with KNpO₂CO₃^[2]
NaNpO₂CO₃ (anhydrous)^[4]
- Neptunyl-carbonate sheets with the same structure as rutherfordine aka uranyl carbonate
- Each neptunyl is bonded to four carbonates, two are bidentate and two are monodentate
NaNpO₂CO₃·3H₂O^[1]^[3]
- consists of NpO+2-CO2−3 sheets and Na-H₂O frameworks^[1]
- Na⁺(aq) + NpO+2(aq) + CO2−3(aq) + 3 H₂O → NaNpO₂CO₃·3H₂O^[3]
LiNpO₂CO₃·2H₂O^[4]
- Made up of NpO+2-CO2−3 sheets, but different than those in NaNpO₂CO₃^[4]
- Each neptunyl is bonded to three bidentate carbonates^[4]
Na₃NpO₂(CO₃)₂^[3]

Neptunyl(VI) carbonates

Binary carbonates

NpO₂CO₃^[3]

Mixed carbonates

(C(NH₂)₃)₄NpO₂(CO₃)₃^[4]
- contains discrete NpO₂(CO₃)4−3 ions^[4]
(C(NH₂)₃)₄NpO₂(CO₃)₃·8H₂O^[4]
- contains discrete NpO₂(CO₃)4−3 ions^[4]
Cs₄NpO₂(CO₃)₃·6H₂O^[4]
- contains discrete NpO₂(CO₃)4−3 ions^[4]

References

^ ^a ^b ^c ^d ^e Kuzenkova, Anastasiia S.; Plakhova, Tatiana V.; Nevolin, Iurii M.; Kulikova, Elizaveta S.; Trigub, Alexander L.; Yapaskurt, Vasiliy O.; Shaulskaya, Maria D.; Tsymbarenko, Dmitry M.; Romanchuk, Anna Yu.; Kalmykov, Stepan N. (13 Dec 2023). "Formation of Neptunium(V) Carbonates: Examining the Forceful Influence of Alkali and Alkaline Earth Cations". Inorganic Chemistry. 62 (51): 21025–21035. doi:10.1021/acs.inorgchem.3c02737. PMID 38091513.
^ ^a ^b ^c ^d ^e ^f ^g ^h https://doi.org/10.3390/sym14122634
^ ^a ^b ^c ^d ^e Lemire, R. J. et al., Chemical Thermodynamics of Neptunium and Plutonium, Elsevier, Amsterdam, 2001.
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j https://doi.org/10.7274/5q47rn3320w

[NaKCaCarbonate-1] Kuzenkova, Anastasiia S.; Plakhova, Tatiana V.; Nevolin, Iurii M.; Kulikova, Elizaveta S.; Trigub, Alexander L.; Yapaskurt, Vasiliy O.; Shaulskaya, Maria D.; Tsymbarenko, Dmitry M.; Romanchuk, Anna Yu.; Kalmykov, Stepan N. (13 Dec 2023). "Formation of Neptunium(V) Carbonates: Examining the Forceful Influence of Alkali and Alkaline Earth Cations". Inorganic Chemistry. 62 (51): 21025–21035. doi:10.1021/acs.inorgchem.3c02737. PMID 38091513.

[NH4NpO2CO3-2] ^ ^a ^b ^c ^d ^e ^f ^g ^h https://doi.org/10.3390/sym14122634

[ChemTherm-3] Lemire, R. J. et al., Chemical Thermodynamics of Neptunium and Plutonium, Elsevier, Amsterdam, 2001.

[Hierarchy-4] ^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j https://doi.org/10.7274/5q47rn3320w

[1]

[2]

[3]

[4]