Extended chains in vanadium O-centered complex [VOSeI]: synthesis and structure.

O-centered tetranuclear vanadium selenoiodide [VOSeI] (1) was synthesized by an ampoule method from the elements with addition of water. Its X-ray crystal structure (space group 2/, = 21.146(2) Å, = 5.

Intraspecific Variation of Brown Rat Rattus norvegicus in Russia by D-Loop mtDNA Data.

For the first time in Russia, the intraspecific structure of the brown rat Rattus norvegicus was studied using the mitochondrial control region (D-loop) as a molecular marker. The mtDNA sequence was determined in brown rats from eight regions of European and Asian Russia. Three rat clades were identified, including one in European Russia and two in Asian Russia.

Construction of Annulated Spiro[4.4]-nonane-diones via the Tandem [4 + 2]-Cycloaddition/Aromatization Reaction.

A method for the synthesis of both symmetric and asymmetric fused spiro[4.4]-nonane-dione derivatives has been developed. It is based on a Diels-Alder reaction of spiro[4.

New 3-Aminopropylsilatrane Derivatives: Synthesis, Structure, Properties, and Biological Activity.

The biologically active compound 3-aminopropylsilatrane (a compound with a pentacoordinated silicon atom) underwent an aza-Michael reaction with various acrylates and other Michael acceptors. Depending on the molar ratio, the reaction yielded Michael mono- or diadducts (11 examples) containing functional groups (silatranyl, carbonyl, nitrile, amino, etc.).

Production, Mechanical and Functional Properties of Long-Length TiNiHf Rods with High-Temperature Shape Memory Effect.

In the present work, the possibility of manufacturing long-length TiNiHf rods with a lowered Hf content and a high-temperature shape memory effect in the range of 120-160 °C was studied. Initial ingots with 1.5, 3.

Evolution of Structure and Properties of Nickel-Enriched NiTi Shape Memory Alloy Subjected to Bi-Axial Deformation.

The effect of a promising method of performing a thermomechanical treatment which provides the nanocrystalline structure formation in bulk NiTi shape memory alloy samples and a corresponding improvement to their properties was studied in the present work. The bi-axial severe plastic deformation of Ti-50.7at.

Sulfuric Acid Solutions of [Pt(OH)(HO)]: A Platinum Speciation Survey and Hydrated Pt(IV) Oxide Formation for Practical Use.

The systematic study of the platinum speciation in sulfuric acid solutions of platinum (IV) hydroxide {[Pt(OH)(HO)], HHPA} was performed with the use of a combination of methods. Depending on the prevailing Pt form, the three regions of HSO concentration were marked: (1) up to 3 M HSO forms unstable solutions gradually generating the PtO·HO particles; (2) 4-12 M HSO, where the series of mononuclear aqua-sulfato complexes ([Pt(SO)(HO)], where = 0···4) dominate; and (3) 12 M and above, where, along with [Pt(SO)(HO)] species, the polynuclear Pt(IV) species and complexes with a bidentate coordination mode of the sulfato ligand are formed. For the first time, the salts of the aqua-hydroxo Pt(IV) cation [Pt(OH)(HO)]SO (triclinic and monoclinic phases) were isolated and studied with a combination of methods, including the single-crystal X-ray diffraction.

Hydrolysis of [PtCl] in Concentrated NaOH Solutions.

The transformations of Pt complex species in concentrated NaOH solutions (1-12 M) of Na[PtCl] were studied with a combination of methods, including Pt nuclear magnetic resonance, ultraviolet-visible, and Raman spectroscopy. The two-step process was observed under the following conditions: (1) formation of the [Pt(OH)Cl] anion that proceeds relatively fast even at room temperature and (2) further slow substitution of the last chlorido ligand with the formation of the [Pt(OH)] anion. Overall, it was determined that the [PtCl] to [Pt(OH)] transformation (especially the first stage) is greatly accelerated under blue light (455 nm) irradiation.

Metalloligand-based coordination polymer embedding the nitrosyl ruthenium complex for photoactive materials with bound nitric oxide.

The stability of a photoactivated isonitrosyl state was boosted by confining a pre-designed bicarboxylate ligand with a ruthenium nitrosyl fragment in a 2D metal-organic framework. The novel Zn/Ru-based MOF, {Zn[RuNO(HO)(inic)(OH)]}·12HO (inic = isonicotinate), was obtained with enhanced isonitrosyl stability by 30 K (up to 200 K) compared to the related ruthenium-only complex.

[NiEn](MoO)(WO) Co-Crystals as Single-Source Precursors for Ternary Refractory Ni-Mo-W Alloys.

The co-crystallisation of [NiEn](NO) (En = ethylenediamine) with NaMoO and NaWO from a water solution results in the formation of [NiEn](MoO)(WO) co-crystals. According to the X-ray diffraction analysis of eight single crystals, the parameters of the hexagonal unit cell (space group -31, = 2) vary in the following intervals: a = 9.2332(3)-9.

Vanadium O-Centered Selenoiodide Complex: Synthesis and Structure of VO(Se)I·I.

The first vanadium selenoiodide VO(Se)I·I was synthesized at a moderate temperature of 220 °C from V, Se, I, and water. Its crystal structure (tetragonal space group 4/, = 11.838(1) Å, = 18.

Intramolecular aurophilic interactions in dinuclear gold(I) complexes with twisted bridging 2,2'-bipyridine ligands.

Elimination of the chloride ion from the [(PPh)AuCl] complex using silver triflate (AgOTf) in the presence of 2,2'-bipyridine Rbpy (the Au : Rbpy molar ratio is 2 : 1) in dichloromethane at room temperature leads to dinuclear gold(I) complexes [(PPhAu)(μ-Rbpy)](OTf) (Rbpy = bpy (1), dbbpy (2), CHObpy (3), 3-COCHbpy (4), 4-COCHbpy (5)) in high yields. The crystal structures for all compounds were determined using X-ray diffraction analysis. In all structures, gold ions are in a typical linear environment, and the bipyridine molecule is twisted, which allows intramolecular aurophilic interactions.

Tetranitratopalladate(II) Salts with Tetraalkylammonium Cations: Structural Aspects, Reactivity, and Applicability toward Palladium Deposition for Catalytic Applications.

A series of salts (RN)[Pd(NO)] (R = CH, CH, n-CH; -) were synthesized in high yield from a nitric acid solution of palladium. The salts were characterized by a combination of physicochemical methods, and their crystal structures were determined by X-ray diffraction. The conformation of the [Pd(NO)] anion was studied in detail using crystal structure data and density functional theory calculations.

RbAgSc(WO): a new glaserite-related structure type, rubidium disorder, ionic conductivity.

A new triple tungstate RbAgSc(WO) (0 ≤ x ≤ 0.15) synthesized by solid state reactions and spontaneous crystallization from melts presents a new structure type related to those of CsNaYb(MoO) and NaSrTa(PO). The title compound in centrosymmetric space group Cmcm contains dimers of two ScO octahedra sharing corners with three bridging WO tetrahedra.

Luminescent Zn(ii) and Cd(ii) complexes with chiral 2,2'-bipyridine ligands bearing natural monoterpene groups: synthesis, speciation in solution and photophysics.

Mononuclear zinc(ii) and cadmium(ii) complexes, ZnLCl2 (1), CdLCl2 (2), ZnL1Cl2·2H2O (3), and CdL1Cl2·2H2O (4), with chiral ligands containing a 2,2'-bipyridine moiety and natural terpene (+)-limonene (L) or (+)-3-carene (L1) moieties were synthesized. In these complexes the L and L1 ligands are shown to coordinate Zn2+ and Cd2+ ions through the 2,2'-bipyridine moiety. The acetamide group of the ligands interacts with M2+ ions by forming NM2+ and C[double bond, length as m-dash]OM2+ contacts and N-HCl hydrogen bonds with coordinated Cl- ions.

Effect of Antimony Buffer Layer on the Electric and Magnetic Properties of 200 and 600 nm Thick Bismuth Films on Mica Substrate.

We report on the production of 200 and 600 nm thick Bi films on mica substrate with 10 nm thick Sb sublayer between Bi and mica. Two types of films have been studied: block and single crystal. Films were obtained using the thermal evaporation technique using continuous and discrete spraying.

Chiral -Symmetric Diimines with 4,5-Diazafluorene Units.

A synthetic approach to a new group of stable chiral -symmetric diimines with the 4,5-diazafluorene core has been developed based on condensation of dipinodiazafluorene with aromatic diamines. The chemical structures of new compounds were proven by spectroscopic methods and X-ray crystallography. All the compounds form solvates with organic solvents (chloroform, benzene, 1,4-dioxane) and water.

Tetraalkylammonium Salts of Platinum Nitrato Complexes: Isolation, Structure, and Relevance to the Preparation of PtO /CeO Catalysts for Low-Temperature CO Oxidation.

A series of tetraalkylammonium salts with anionic platinum nitrato complexes (MeN)[Pt(μ-OH)(NO)] (1), (EtN)[Pt(μ-OH)(NO)] (2), ( n-PrN)[Pt(μ-OH)(NO)] (3b), ( n-PrN)[Pt(NO)] (3a), and ( n-BuN)[Pt(NO)] (4) were isolated from nitric acid solutions of [Pt(HO)(OH)] in high yield. The structures of salts 2, 3a, 3b, and 4, prepared for the first time, were characterized by X-ray diffraction. The sorption of [Pt(NO)] and [Pt(μ-OH)(NO)] complexes onto the ceria surface from acetone solutions of salts 4 and 1 was examined.

Semiclathrate Hydrates in Tri-n-butylphosphine Oxide (TBPO)-Water and TBPO-Water-Methane Systems.

In the present work, we studied semiclathrate hydrates in the TBPO-HO and TBPO-HO-CH systems. The stoichiometry, temperature, and enthalpy of dissociation of TBPO semiclathrate hydrate crystals formed in the TBPO-HO binary system were found to be TBPO·33.6 ± 0.

In silico design of high-affinity ligands for the immobilization of inulinase.

Using computer modeling, virtual screening of high-affinity ligands for immobilization of inulinase - an enzyme that cleaves inulin and fructose-containing polymers to fructose - has been performed. The inulinase molecule from Aspergillus ficuum (pdb: 3SC7) taken from the database of protein structures was used as a protein model and the target for flexible docking. The set of ligands studied included simple sugars (activators, inhibitors, products of enzymatic catalysis), as well as high-molecular weight compounds (polycation and polyanion exchange resins, glycoproteins, phenylalanine-proline peptide, polylactate, and caffeine).

1,2,4-Triphospholyl anions - versatile building blocks for the formation of 1D, 2D and 3D assemblies.

The potential of K[P3C2R2] (R = (t)Bu, Mes) as building blocks in metallo-supramolecular chemistry was investigated and self-assembly processes with Cu(i) halides resulted in the formation of a large variety of unprecedented one-, two- and even three-dimensional aggregates. The 3D networks showed an interesting topological similarity to allotropes of carbon: diamond and the theoretically proposed polybenzene. Furthermore, the negative charge of the phospholyl ligand favoured the generation of cationic CuaXb (a > b, X = Cl, Br, I) assemblies, a challenging area within the well-studied coordination chemistry of CuX units.

Structural and dynamic properties of thymopoietin mimetics.

We propose a hypothesis that the T-cell receptor is a possible target of thymic hormones. We modelled the conformational dynamics of thymopentin and its structural variants in solution, as well as the interactions of these short peptides with the proposed molecular target. Thymopentin is a five-amino-acid fragment of the thymic hormone thymopoietin (residues 32 to 36) that reproduces the immunomodulatory activity of the complete hormone.