Crystal and molecular structure of ammonium trinitratouranylate NH4[UO2(NO3)3]

Belomestnykh, V. I.; Свешникова, Л. Б.; Mikhaǐlov, Yu. N.; Kanishcheva, A. S.

doi:10.1134/s0036023611120278

Cited by 8 publications

(5 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For the uranium compounds (with M = K + , Rb + , Cs + , and NH 4 + ), the average bond distances for the UO and are 1.760(2) and 2.477(3) Å, respectively. These bond lengths are consistent with, though slightly longer than, those previously reported, MUO 2 (NO 3 ) 3 : d(UO) = 1.750(5) Å and d(U–O) = 2.477(4) Å. − For the neptunium compounds (with M = K + , Rb + , Cs + , and NH 4 + ), the average bond distances for the NpO and are 1.748(3) and 2.469(2) Å, respectively. Comparison with the available data for previously reported CsNpO 2 (NO 3 ) 3 and RbNpO 2 (NO 3 ) 3 , 1.744(2) and 1.731(8) Å, and the bond distances, 2.472(2) and 2.47(3) Å, shows that they are consistent with our results. , …”

Section: Results and Discussionsupporting

confidence: 88%

“…We have extended these studies to include anionic actinyl nitrato complexes. The solid-state molecular structures determined by single-crystal X-ray diffraction for the uranyl trinitrate complexes with the cations studied here have been previously reported, − while only two crystal structures, RbNpO 2 (NO 3 ) 3 and CsNpO 2 (NO 3 ) 3 , can be found for the transuranium cations in the series from single-crystal data. The trinitrate actinyl complexes MAnO 2 (NO 3 ) 3 crystallize in two crystal systems: monoclinic Me 4 NAnO 2 (NO 3 ) 3 : P 2 1 / c and KUO 2 (NO 3 ) 3 : ( C 2/ c ) and trigonal R 3̅ c for the remaining K + salts of Np(VI) and Pu(VI) and all Rb + , Cs + , and NH 4 + salts).…”

Section: Results and Discussionmentioning

confidence: 69%

See 1 more Smart Citation

Periodic Trends within Actinyl(VI) Nitrates and Their Structures, Vibrational Spectra, and Electronic Properties

et al. 2022

View full text Add to dashboard Cite

Pu, and AnO 2 (NO 3 ) 2 (H 2 O) 2 •H 2 O, and the uranyl tetranitrates M 2 UO 2 (NO 3 ) 4 have been synthesized from aqueous solution and their structures determined using single-crystal X-ray diffraction. Together, these complexes represent an isostructural series of actinide complexes among the salts crystallized with the same charge-compensating cation and have been studied using vibrational spectroscopy including Raman and Fouriertransform infrared. Periodic trends in both the structural properties of these complexes and their vibrational spectra are presented and discussed, in particular the invariant nature of the O�An�O asymmetric stretching frequencies observed across the actinyl series. Electronic structure calculations were performed at a variety of levels of theory to aid in the interpretation of the vibrational data and to correlate trends in the data with the underlying electronic properties of these molecules.

show abstract

Section: Results and Discussionsupporting

confidence: 88%

Section: Results and Discussionmentioning

confidence: 69%

Periodic Trends within Actinyl(VI) Nitrates and Their Structures, Vibrational Spectra, and Electronic Properties

et al. 2022

View full text Add to dashboard Cite

show abstract

“…When solution conditions are held nearly uniform, in the case of acidic solution conditions, both the U(VI) and Np(VI) cations are expected to behave exclusively as the uncomplexed uranyl, UO 2 2+ , and neptunyl, NpO 2 2+ , ions. , This subsequently allows for the systematic examination of how the specific countercations A + affect structure formation. For instance isostructural relationships occur in the A [(U/NpO 2 )O 2 (NO 3 ) 3 ] variants when A = Rb, NH 4 , Cs, ,,,, all forming hexagonal structures under acidic conditions. However, divergence is seen in the case of K (Tables and ), where K[UO 2 (NO 3 ) 3 ] is monoclinic and K[NpO 2 (NO 3 ) 3 ] is hexagonal.…”

Section: Resultsmentioning

confidence: 99%

“…53,54 This subsequently allows for the systematic examination of how the specific countercations A + affect structure formation. For instance isostructural relationships occur in the A[(U/ NpO 2 )O 2 (NO 3 ) 3 ] variants when A = Rb, NH 4 , Cs, 44,45,50,51,55 all forming hexagonal structures under acidic conditions. However, divergence is seen in the case of K (Tables 2 and 3), where K[UO 2 (NO 3 ) 3 ] 52 is monoclinic and K[NpO 2 (NO 3 ) 3 ] 45 is hexagonal.…”

Section: Table 1 Crystallographic Data For All Phases Reported In Thi...mentioning

confidence: 99%

Insights into the Structural Chemistry of Anhydrous and Hydrous Hexavalent Uranium and Neptunium Dinitrato, Trinitrato, and Tetranitrato Complexes

et al. 2020

View full text Add to dashboard Cite

A systematic investigation is presented which examines the structural chemistry of anhydrous and hydrous ternary hexavalent uranium and neptunium dinitrato, trinitrato, and tetranitrato complexes. Using slow evaporation methods under acidic conditions the uranium and neptunium nitrate complexes γ-K[UO2(NO3)3], K2[UO2-cis-(NO3)4], [NpO2(NO3)2(H2O)2]·4H2O, and Cs[NpO2(NO3)3] have been synthesized and their structures refined using single-crystal X-ray diffraction data. γ-K[UO2(NO3)3] adopts an orthorhombic structure in space group Pbca consisting of antiparallel aligned [UO2(NO3)3]− moieties. K2[UO2-cis-(NO3)4] adopts a monoclinic structure in space group P21/c consisting of [UO2(NO3)4]2– moieties with two monodentate and two bidentate nitrate ligands that are arranged in a cis configuration about the uranyl, UO2 2+, center. Previous investigations have only identified trans variants of this monoclinic structure, and this is the first report of the cis form and also the occurrence of geometric isomerism in uranyl nitrates. [NpO2(NO3)2(H2O)2]·4H2O adopts an orthorhombic structure in space group Cmc21 consisting of parallel aligned [NpO2(NO3)2(H2O)2] moieties that are in a trans configuration with respect to the bidentate nitrate ligands. Cs[NpO2(NO3)3] adopts a hexagonal structure in space group R c consisting of parallel aligned [NpO2(NO3)3]− moieties. It was found that despite using a Np(V) nitrate solution as the starting reagent, Np(VI) nitrate structures were consistently recovered under acidic conditions. These observations are discussed and rationalized with respect to standard reduction potentials, particularly how redox conditions and acidity affect the oxidation state of Np and subsequent structure formation. The structures uncovered in this investigation are discussed comparatively and systematically in detail with other reported anhydrous and hydrous ternary hexavalent uranium and neptunium dinitrato, trinitrato, and tetranitrato complexes, particularly with respect to how synthesis conditions, including pH and geometric isomerism, affect the structural chemistry.

show abstract

“…This rather simple structural type appeared to be more common among inorganic compounds (9). Those are mostly uranyl trinitrates of mono valent cations (e.g., [37][38][39][40]). And only four organically templated structures are known (e.g., [24,41]).…”

Section: Structural Topologymentioning

confidence: 99%

Uranyl Nitrates: By-Products of the Synthetic Experiments or Key Indicators of the Reaction Progress?

2020

View full text Add to dashboard Cite

Six novel uranyl nitrate compounds K3[(UO2)(NO3)Cl3](NO3) (1, 2), α-Cs2[(UO2)(NO3)Cl3] (3), [(UO2)(NO3)2(H2O)2][(CH3NH3)2(NO3)2] (4), Cs2[(UO2)(NO3)4] (5), and [(UO2)2(OH)2(NO3)2(H2O)3](H2O) (6) have been prepared from aqueous solutions. Their structures were analyzed using single-crystal X-ray diffraction technique. Structural studies have shown that the crystals of 1 and 2 are isotypic but differ in the distortion at the counter ion’s sites. The crystal of 3 is a low-temperature polymorph modification of the recently studied compound. The crystal structure of 4 is composed of uranyl-dinitrate-dihydrate and methylamine-nitrate electroneutral complexes linked through the system of H-bonds. The crystal structure of 5 is based on the finite [(UO2)(NO3)4]2− clusters that are arranged in pseudo-chained complexes extended along [100] and are arranged according to a hexagonal packing or rods. The crystal of 6 is also a novel polymorph modification of previously studied compound, the structure of which is based on the very rare topological type of the finite clusters. Nowadays, uranyl nitrate finite clusters of nine various topological types are known. We give herein a short review of their topological features and relationships. Crystallization of uranyl nitrates usually occurs when all other competitive anions in the system have already formed crystalline phases, or the reaction of reagents have slowed down or even stopped. Thus it is suggested that crystallization of uranyl nitrates can be used as a key indicator of the reaction progress, which points to the necessity of the initial concentrations of reagents correction, or to the replacement of reagents and adjustment of the thermodynamic (P,T) parameters of the synthesis.

show abstract

Crystal and molecular structure of ammonium trinitratouranylate NH4[UO2(NO3)3]

Cited by 8 publications

References 8 publications

Periodic Trends within Actinyl(VI) Nitrates and Their Structures, Vibrational Spectra, and Electronic Properties

Periodic Trends within Actinyl(VI) Nitrates and Their Structures, Vibrational Spectra, and Electronic Properties

Insights into the Structural Chemistry of Anhydrous and Hydrous Hexavalent Uranium and Neptunium Dinitrato, Trinitrato, and Tetranitrato Complexes

Uranyl Nitrates: By-Products of the Synthetic Experiments or Key Indicators of the Reaction Progress?

Contact Info

Product

Resources

About