Decomposition of pentaammineaquacobalt(III) perchlorate under laser radiation action

Photolytic decomposition of the complex [Co(NH₃)₅(H₂O)](ClO₄)₃ under the action of a laser with a wavelength of 355 nm, which is resonant in energy to the energy of the (¹ A _1g → ¹ T _2g ) d–d transition, was studied. Decomposition of the complex is accompanied by a release of ammonia with its subsequent oxidation to nitrogen oxides and by partial cobalt reduction with the formation of the mixed cobalt(II, III) oxide Co₃O₄.     

Formation of complex structural units and structure of some chalco-halide glasses

Raman spectra, thermal expansion and glass transition temperature of glasses and evolution of Raman spectra of CsGaS_1.5Cl glasses with complete substitution of S by Se and partial substitution of Ga by Al (or In) and of Cl by Br (or I) were studied. The structure of these glasses was discussed considering the ability of A(III) metals to form complex tetrahedral structural units [A(III)B(VI or VII)₄]¹⁻, which can be connected by sharing either the common corner of tetrahedra (glasses of systems at x>0.1 and CsInS_1.5Cl glass) or the common edge of tetrahedra (CsGaS_1.5Cl, CsAlS_1.5Cl, CsGaSe_1.5Cl, CsGaS_1.5Br, CsGaS_1.5I glasses).     

Influence of the Mechanism of the Initial Stages of the Ligand Decomposition on the Initiating Ability of Cobalt(III) Ammine Tetrazolate Complexes

Russian Journal of General Chemistry - The results of quantum chemical calculations for isolated molecules of pentaammine-(5-cyano-2H-tetrazolato-N2)cobalt(III) perchlorate,...     

A glass-forming system with compound-forming tendency: As4S6---P4S10

Glasses in the quasi-binary system (As₄S₆)_x(P₄S₁₀)_1−x x = 0.1, …, 1.0, are produced and studied by thermal analysis, X-ray, and Raman spectroscopy. The phase diagram of the system and the critical cooling rate for glass formation both have their maximum at x = 0.5, corresponding to the compound As₂P₂S₈; the X-ray structure of recrystallized samples can be described as a sum of the As₂P₂S₈ (x = 0.5)- and the P₄S₁₀-structure (As₄S₆ not visible); Raman spectra of the glasses are again sums of As₂P₂S₈- and As₄S₆/P₄S₁₀-spectra. All these observations support the assumption that a stable building block corresponding to the 1:1 compound As₂P₂S₈ and surplus As₄S₆ (or P₄₁₀) are the essential elements of the structure in the glasses.     

On the mechanism of cobalt(III) aminates pyrolysis

Pyrolysis of the complex (ato-N²)pentaammincobalt(III) perchlorate and the ligand 5-nitrotetrazole, and also of the initial complex aquapentaammincobalt(III) perchlorate was studied by the mass spectroscopy method. The leading oxidizer of ligands in the complexes is changed for the outer-sphere perchlorate ion at the pyrolysis temperature of ~250°C.     

Features of Chemical Interactions in Silver Chalcogenides Responsible for Their High Plasticity

Russian Journal of General Chemistry - A possibility of the existence of metallophilic Ag–Ag interactions in silver chalcogenides and their influence on the properties of these compounds were...     

Bandgap guidance in hybrid chalcogenide-silica photonic crystal fibers

We report a hybrid chalcogenide-silica photonic crystal fiber made by pressure-assisted melt-filling of molten glass. Photonic bandgap guidance is obtained at a silica core placed centrally in a hexagonal array of continuous centimeters-long chalcogenide strands with diameters of 1.45 μm. In the passbands of the cladding, when the transmission through the silica core is very weak, the chalcogenide strands light up with distinct modal patterns corresponding to Mie resonances. In the spectral regions between these passbands, strong bandgap guidance is observed, where the silica core transmission loss is 60 dB/cm lower. The pressure-assisted fabrication approach opens up new ways of integrating sophisticated glass-based devices into optical fiber circuitry with potential applications in supercontinuum generation, magneto-optics, wavelength selective devices, and rare-earth-doped amplifiers with high gain per unit length.     

Logarithmic Relaxation of the Specific Volume and Optical Properties of GeS2 Densified Glass

Journal of Experimental and Theoretical Physics - The relaxation of the optical absorption edge and of the linear sizes of stoichiometric GeS2 glass densified at a high hydrostatic pressure have...