Crystal Structure and Thermal Properties of Double-Complex Salts [M(NH)][M(CO)] (M, M = Co, Rh) and K[Rh(NH)][Rh(CO)]∙6HO.

Here, seven new double-complex salts, [M(NH)][M(CO)] (M, M = Co, Rh) and K[Rh(NH)][Rh(CO)]∙6HO types, are synthesised. The crystal structure and composition of DCS (double-complex salts) are studied by SCXRD, XRD, CHN and IR methods. The complex salts of the [M(NH)][M(CO)] (M, M = Co, Rh) type can be crystallised both as a crystalline hydrate [M(NH)][M(CO)]·3HO (sp.

Structural Diversity and Carbon Dioxide Sorption Selectivity of Zinc(II) Metal-Organic Frameworks Based on Bis(1,2,4-triazol-1-yl)methane and Terephthalic Acid.

A three-component reaction between the 1,4-benzenedicarboxylic (terephthalic) acid (Hbdc), bis(1,2,4-triazol-1-yl)methane (btrm) and zinc nitrate was studied, and three new coordination polymers were isolated by a careful selection of the reaction conditions. Coordination polymers {[Zn(DMF)(btrm)(bdc)]·nDMF} and {[Zn(btrm)(bdc)]·nDMF} containing trinuclear {Zn(bdc)} secondary building units are joined by btrm auxiliary linkers into three-dimensional metal-organic frameworks. The coordination polymer {[Zn(bdc)(btrm)]∙nDMF} consists of Zn cations joined by bdc and btrm linkers into a two-fold interpenetrated network.

Synthesis and investigation of the thermal properties of [Co(NH)][Co(CO)]·3HO and [Ir(NH)][Ir(CO)].

The complexes [Co(NH)][Ir(CO)] and [Ir(NH)][Co(CO)]·HO have previously been synthesized and their thermal properties studied. The [Ir(NH)][Ir(CO)] and [Co(NH)][Co(CO)]·3HO complexes considered here are the end members in a series of possible isostructural solid solutions based on the complex salts in the Co-Ir system. Their crystal structures and thermal properties are described in detail, including temperature-dependent in situ X-ray diffraction.

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.

Formation of Catalytically Active Nanoparticles under Thermolysis of Silver Chloroplatinate(II) and Chloroplatinate(IV).

The thermal behaviour of Ag[PtCl] and Ag[PtCl] complex salts in inert and reducing atmospheres has been studied. The thermolysis of compounds in a helium atmosphere is shown to occur in two stages. At the first stage, the complexes decompose in the temperature range of 350-500 °C with the formation of platinum and silver chloride and the release of chlorine gas.

Revisiting Sodium Hexafluoroiridates: Perspective Precursors for Electronic, Quantum, and Related Materials.

The following salts have been synthesized and structurally characterized: Na[IrF]·2HO (2/, = 6.6327(4), = 10.0740(6), = 5.

Synthesis and Sorption Properties towards Sr-90 of Composite Sorbents Based on Magnetite and Hematite.

The article describes the synthesis of composite sorbents by immobilizing iron oxide in a polymer matrix with subsequent hydrothermal treatment at a temperature of 175 °C. The sorbents based on magnetite and hematite were synthesized, their magnetic properties and phase composition were evaluated, and the iron content was determined. Sorption characteristics of the composites towards microconcentrations of Sr-90 radionuclide in solutions with different mineralization and pH were investigated.

Tetraammineplatinum(II) and Tetraamminepalladium(II) Chromates as Precursors of Metal Oxide Catalysts.

[M(NH ) ]A (M=Pt, Pd; A=CrO , Cr O ) and [Pt(NH ) (NO )(Cr O )]NO complex salts were synthesized and characterized by a number of physicochemical methods of analysis (IR, single-crystal and powder XRD, and simultaneous thermogravimetry and differential scanning calorimetry with evolved gas analysis mass spectrometry). Thermolysis of the salts obtained in a hydrogen atmosphere proceeds with the partial reduction of chromium to a metallic state and the formation of M Cr (M=Pt, Pd) metal solid solution with a chromium content of up to 22 at % and chromium(III) oxide. The thermal decomposition of salts in an inert and oxidizing atmosphere passes through the formation stage of the MCrO phase with the delafossite structure followed by its subsequent decomposition into chromium(III) oxide and noble metal.

Facile Synthesis of 3-(Azol-1-yl)-1-adamantanecarboxylic Acids-New Bifunctional Angle-Shaped Building Blocks for Coordination Polymers.

For the first time, orthogonally substituted azole-carboxylate adamantane ligands were synthesized and used for preparation of coordination polymers. The angle-shaped ligands were prepared by the reaction of 1-adamantanecarboxylic acid and azoles (1-1,2,4-triazole, 3-methyl-1-1,2,4-triazole, 3,5-dimethyl-1-1,2,4-triazole, 1-tetrazole, 5-methyl-1-tetrazole) in concentrated sulfuric acid. Variation of the solvent and substituents in azole rings allowed to prepare both 1D and 2D copper(II) and nickel(II) coordination polymers, [Cu(trzadc)(HO)]∙DMF∙0.

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.