Mixed-Valence Np/An Molybdate Complexes with Single-Charge Outer-Sphere Cations.

Five new mixed-valence Np/An molybdates of the composition [C(NH)][(NpO)(NpO)(MoO)(HO)]·HO (), [C(NH)][(NpO)(NpO)(MoO)(HO)]·3HO (), Na[(NpO)(PuO)(MoO)(HO)]·HO (), Na[(NpO)(UO)(MoO)]·13HO (), and LiNa[(NpO)(NpO)(MoO)(HO)]·4HO () have been synthesized and structurally characterized. The coordination polyhedra of the Np and An atoms in compounds - are pentagonal bipyramids. The basis of structures - is anionic layers of the composition [(NpO)(AnO)(MoO)(HO)].

Quasielastic Light Scattering in the Broadband Brillouin Spectra of Relaxor Ferroelectric PbMgNbO.

In this paper, the behavior of quasielastic light scattering (QELS) in a PbMgNbO (PMN) crystal under broadband Brillouin light scattering in a temperature range from 750 K to 80 K was studied. It was shown that QELS consists of two components: narrow (0.9 GHz to 11 GHz) and wide (80 GHz to 600 GHz).

Novel Synthesis Methods of New Imidazole-Containing Coordination Compounds Tc(IV, V, VII)-Reaction Mechanism, Xrd and Hirshfeld Surface Analysis.

In this work, we have proposed two new methods for the synthesis of [TcOL] (where L = imidazole (Im), methylimidazole (MeIm)) complexes using thiourea (Tu) and Sn(II) as the reducing agents. The main and by-products of the reactions were determined, and possible reaction mechanisms were proposed. We have shown that the reduction of Tc(VII) with thiourea is accompanied by the formation of the Tc(III) intermediate and further oxidation to Tc(V).

A 70-Year-Old Mystery in Technetium Chemistry Explained by the New Technetium Polyoxometalate [H O ] [Tc O ] ⋅ 4H O.

[H O ] [Tc O ] ⋅ 4H O [1] was prepared from an aqueous Tc O solution concentrated over anhydrous H SO . [Tc O ] is the first polyanionic species to be reported for Tc. The unit cell contains one centrosymmetric [Tc O ] polyanion as well as hydronium ions and water molecules.

Plasma Parameters around a Chain-Like Structure of Dust Particles in an External Electric Field.

The formation of a 1D chain-like structure of dust particles in a low-temperature argon plasma was studied. A new numerical model for calculation of the self-consistent spatial distribution of plasma parameters around a chain of dust particles was presented. The model described the motion of positively charged ions in the electric potential of several negatively charged dust particles, taking into account the action of an external electric field.

Neptunium(V) Isothiocyanate Complexes with 4'-Aryl-Substituted 2,2':6',2″-Terpyridines and ,-Dimethylacetamide as Molecular Ligands.

New complexes of neptunyl(V) isothiocyanate with 4'-aryl-substituted 2,2':6',2″-terpyridines (Terpy) and ,-dimethylacetamide (DMA) were obtained: [(NpO)(4'-Ph-Terpy)(DMA)(NCS)]·DMA, [(NpO)(4'-(4-(CF)CH)-Terpy)(DMA)(NCS)]·2HO·DMA, [(NpO)(4'-(3-BrCH)-Terpy)(DMA)(NCS)]·DMA, and [(NpO)(4'-(2-(COOH)CH)-Terpy)(DMA)(NCS)]·DMA. The structures of the compounds were determined with X-ray diffraction analysis. The neptunium coordination polyhedra were found to be pentagonal bipyramids with O atoms of the NpO groups in the apical positions and the equatorial planes formed by three N atoms of the terpyridine ligand, a N atom of the isothiocyanate anion, and an O atom of DMA.