The (CNH)[Cu(HO)]() Structural Family: When Fluoroberyllate, Sulfate, and Selenate Are Full Analogs.

Two new organo-inorganic hybrids, (CNH)[Cu(HO)](BeF) () and (CNH)[Cu(HO)](SeO) (), were prepared via the interaction of ethylenediamine, copper fluoroberyllate or selenate, and H[BeF]/HSeO in aqueous solutions. The structures of and are similar to each other and the previously reported (CNH)[Cu(HO)](SO): monoclinic, 2/, = 5.1044(2) Å, = 11.

An SPS-RS Technique for the Fabrication of SrMoO Powellite Mineral-like Ceramics for Sr Immobilization.

This paper reports a method for the fabrication of mineral-like SrMoO ceramics with a powellite structure, which is promising for the immobilization of the high-energy Sr radioisotope. The reported method is based on the solid-phase "in situ" interaction between SrO and MoO oxides initiated under spark plasma sintering (SPS) conditions. Dilatometry, XRD, SEM, and EDX methods were used to investigate the consolidation dynamics, phase formation, and structural changes in the reactive powder blend and sintered ceramics.

Radionuclides' Recovery from Seawater Using FIC and FIC A Sorbents.

To solve radioecological and oceanological problems (estimate the vertical transport, flows of particulate organic carbon, phosphorus biodynamics, submarine groundwater discharge, etc.), it is necessary to determine the natural values of the radionuclides' activity in seawater and particulate matter. For the first time, the radionuclides' sorption from seawater was studied using sorbents based on activated carbon modified with iron(III) ferrocyanide (FIC) and based on activated carbon modified with iron(III) hydroxide (FIC A-activated FIC) obtained by FIC sorbent treatment with sodium hydroxide solution.

Be Recovery from Seawater by Sorbents of Various Types.

For the first time, a comprehensive study of sorbents based on manganese dioxide was carried out for beryllium sorption from seawater in laboratory and expeditionary conditions. The possibility of using several commercially available sorbents based on manganese dioxide (Modix, MDM, DMM, PAN-MnO) and phosphorus(V) oxide (PD) for Be recovery from seawater for solving oceanological problems was evaluated. Beryllium sorption under static and dynamic conditions was studied.

Estimation of Ra and Ra Content Using Various Types of Sorbents and Their Distribution in the Surface Layer of the Black Sea.

Radium isotopes have traditionally been used as tracers of surface and underground fresh waters in land-ocean interactions. The concentration of these isotopes is most effective on sorbents containing mixed oxides of manganese. During the 116 RV Professor Vodyanitsky cruise (22 April-17 May 2021), a study about the possibility and efficiency of Ra and Ra recovery from seawater using various types of sorbents was conducted.

Assessment of Seasonal Variability in Phosphorus Biodynamics by Cosmogenic Isotopes P, P around Balaklava Coast.

The sorption efficiency of phosphorus from seawater by aluminum oxide and sorbents based on Fe(OH) obtained by various methods (using prepared sodium ferrate or precipitation of Fe(OH) with ammonia) was assessed. It was shown that phosphorus was recovered most efficiently at a seawater flow rate of one-to-four column volumes per minute with a sorbent based on hydrolyzed polyacrylonitrile fiber with a precipitation of Fe(OH) with ammonia. Based on the results obtained, a method for phosphorus isotopes recovery with this sorbent was suggested.

Photonuclear Alchemy: Obtaining Medical Isotopes of Gold from Mercury Irradiated on Electron Accelerators.

In our work, the photonuclear production of Au isotopes for nuclear medicine purposes was studied, and a method for their recovery from irradiated mercury was developed. The yields of the corresponding nuclear reactions were determined, and a comparison of various methods of obtaining gold radioisotopes was provided. New sorbents based on benzo-15-crown-5, which selectively binds gold, were studied, and the optimal conditions for Au recovery with a high degree of purification from mercury were found.

Recovery of Uranium by Se-Derivatives of Amidoximes and Composites Based on Them.

An Se-derivative of amidoxime was synthesized for the first time as a result of the reaction of oxidative polycondensation of N'-hydroxy-1,2,5-oxadiazole-3-carboximidamide with SeO: its elementary units are linked to each other due to the formation of strong diselenide bridges. The element composition of the material was established, and the structure of the elementary unit was suggested. The sorption-selective properties were evaluated, and it was found that the adsorbent can be used for the selective recovery of U (VI) from liquid media with a pH of 6-9.

Chemically Induced Polytypic Phase Transitions in the Mg[(UO)(O)(HO)](HO) ( = S, Se) System.

Chemically induced polytypic phase transitions have been observed during experimental investigations of crystallization in the mixed uranyl sulfate-selenate Mg[(UO)(O)(HO)](HO) ( = S, Se) system. Three different structure types form in the system, depending upon the Se:S ratio in the initial aqueous solution. The phases with the Se/(Se + S) ratios (in mol %) in the ranges 0-9, 16-47, and 58-100 crystallize in the space groups 2, 2, and 2/, respectively.

Macrocyclic receptor for pertechnetate and perrhenate anions.

The design and synthesis of a neutral macrocyclic host that is capable of perrhenate and pertechnetate recognition is described. The anion affinities and underlying coordination modes were estimated by several experimental and theoretical methods including a new technique--reverse (99)Tc NMR titration.

Interaction of transuranium elements with biologically important ligands: structural and spectroscopic evidence for nucleotide coordination to plutonium.

The first complex of a transuranium element (tetravalent plutonium) with nucleotide (deoxycytidinemonophosphate, dCMP) was synthesized and structurally characterized. The crystal structure of [Pu(4)(NO(3))(8)(HdCMP)(4)(H(2)O)(8)](NO(3))(4).2H(2)O consists of complex cations [Pu(4)(NO(3))(8)(HdCMP)(4)(H(2)O)(8)](4+), NO(3)(-) anions, and water molecules.

Interaction of transuranium elements with biologically important molecules: structural and spectroscopic study of NP(V) complexes with imidazole.

New Np(V) complexes with imidazole, [NpO(2)(CH(3)COO)(Im)(2)(H(2)O)], [(NpO(2))(2)(C(2)O(4))(Im)(6)] x 5 Im x H(2)O, and [NpO(2)(NO(2))(Im)(4)], were synthesized. Their crystal structures were determined using X-ray single-crystal diffractometry. The crystal structures are confirmed by IR and UV-vis spectroscopic data.

First structural evidence of actinide-nitrite coordination.

The first nitrite complex of actinide metal, {C(NH 2)3}2[NpO 2(NO 2)(Pic)2], was synthesized, and its crystal structure was determined using X-ray diffractometry and confirmed by NIR and IR spectroscopies. Main crystallographic data: space group P1, triclinic, a = 8.9329(1) A, b = 11.

Highly porous uranyl selenate nanotubules.

A first amine-templated uranyl selenate based upon highly porous uranyl selenate nanotubules, (C4H12N)14[(UO2)10(SeO4)17(H2O)], has been prepared in the room-temperature reaction of uranyl nitrate, butylamine, and H2SeO4 in aqueous solution. The structure consists of nanometer-scale tubular [(UO2)10(SeO4)17(H2O)]14- units packed in a hexagonal-type fashion. The tubules have elliptical cross section with outer dimensions of 25 x 23 A = 2.