Solubility and Stability of Peroxosolvates Na4P2O7·3H2O2 and Na2HPO4·H2O2 in Polyatomic Alcohols, Glycerol and Ethylene Glycol, and in Water-Alcohol Mixtures

Solubility and stability of peroxosolvates of sodium phosphates in polyatomic alcohols (glycerol and ethylene glycol) and in water-alcohol mixtures, as well as their applicability in development of disinfectants, were studied. __________ Translated from Zhurnal Prikladnoi Khimii, Vol. 78, No. 8, 2005, pp. 1398–1399. Original Russian Text Copyright ? 2005 by Titova, Nikol'skaya, Buyanov, Pudova.     

Synthesis of 1,3-benzothiazol-2(3<Emphasis Type="Italic">H</Emphasis>)-one and some its derivatives

Acylation of 2-aminobenzenethiol with methyl chloroformate in pyridine gave dimethyl 2,2′-disulfanediylbis(2,1-phenylene)dicarbamate instead of expected methyl 2-suylfanylphenylcarbamate. Heating of the product with zinc dust in glacial acetic acid led to the formation of 1,3-benzothiazol-2(3H)-one. Alkylation of the latter with 1,2-dibromoethane and allyl bromide, as well as acylation with chloroacetyl chloride, afforded the corresponding 3-substituted derivatives. 3-[3-(Pyridin-2-yl)-4,5-dihydroisoxazol-5-ylmethyl]-1,3-benzothiazol-2(3H)-one was synthesized with high regioselectivity by 1,3-dipolar cycloaddition of 3-allyl-1,3-benzothiazol-2(3H)-one to pyridine-2-carbonitrile oxide generated fromN-hydroxypyridine-2-carboximidoyl chloride hydrochloride by the action of triethylamine.     

T-odd asymmetries for products from the spontaneous fission of oriented nuclei

The problem of describing T-odd asymmetries in ternary fission reactions of oriented nuclei is solved for the first time on the basis of quantum theory. Estimates of the T-odd asymmetry coefficients in the angular distributions of the reaction products are obtained using the spin density matrix of the oriented fissioning nucleus. It is demonstrated that experiments on observing T-odd asymmetries in the spontaneous fission of oriented nuclei are of interest because the T-odd asymmetry coefficients can be around an order of magnitude greater than similar coefficients in the fission of unoriented target nuclei induced by polarized neutrons.     

Structure and properties of the intercalation compound Fe x TiTe2

The Fe _x TiTe₂ system, which belongs to the class of materials with the electronic spectrum containing below the Fermi level the band of localized states with a strong temperature dependence of the band width, has been investigated experimentally. Heating of the material leads to a broadening of the band of localized states. When the top of this band crosses with the Fermi level, the effect of retrograde solubility is observed in the system; i.e., the metal precipitates to the composition ensuring the absence of increase in the Fermi energy during heating. The influence of the band of localized states on the structure of the material and its magnetic and electrical properties has been analyzed.     

Spin interference in the spin density matrix of a compound nucleus in reactions of nuclear fission by cold polarized neutrons

Spin density matrices of neutron resonance states of a compound nucleus formed in the reaction of capture of a polarized neutron by a non-oriented target nucleus for different directions of neutron polarization vector are constructed within the quantum fission theory. The obtained spin matrices are used to calculate T-odd asymmetries in differential cross sections of ternary nuclear fission with the emission of different third particles. It is demonstrated that the expressions for T-odd asymmetries in the cases of neutron polarization direction [(p)\vec]_n\vec p_n along the x and y axes in the laboratory reference frame differ by the values of the unified correlator of the form ( [(p)\vec]_n ,[ [(k)\vec]_LF ,[(k)\vec]₃ ] )\left( {\vec p_n ,\left[ {\vec k_{LF} ,\vec k_3 } \right]} \right) (where [(k)\vec]_LF\vec k_{LF} and [(k)\vec]₃\vec k_3 are the wave vectors of a light fission fragment and the third particle, respectively), and are transformed into one another if the laboratory reference frame in which [(p)\vec]_n\vec p_n is directed along the x axis is rotated to a laboratory reference frame in which [(p)\vec]_n\vec p_n is directed along the y axis. It is shown that T-odd TRI and ROT asymmetries are associated, respectively, with the odd and even components of the amplitudes of the angular distribution of third particles perturbed by the collective rotation of a polarized fissile nucleus, and each of these amplitudes can be considerably amplified (or suppressed) relative to one another due to the interference from fission amplitudes of pairs of neutron resonances sJ _s and s′J _s′ .     

Aminomethylation of acetylene alcohols and their esters with gem-diamines catalyzed by complexes of d-transition and rare-earth metals

An efficient synthetic procedure was developed for preparation of oxygen-containing propargylamines with high yields and selectivity by aminomethylation of propargyl alcohols and their esters with gem-diamines catalyzed by complexes and salts of d-transition metals and lanthanides.     

Influence of hardener on physicochemical and dynamic properties of polyurethanes based on α,ω-di(2-hydroxypropyl)-polybutadiene Krasol LBH-3000

The peculiarities of how hardener influences the structural, physicochemical, dynamic elastic hysteresis, and relaxation properties of materials based on oligodienediol Krasol LBH-3000 are established. It is shown that polydieneurethanes hardened under conditions where the ratio of the reactive groups is NCO/Σ(OH) ≈ 0.9−1.25 mol/mol have optimal properties.     

Surfactant-modified polypropylene as a catalyst for oxidation of mercaptans

Surface modification of polypropylene by soluble metallophthalocyanine was performed. The effect of pretreatment of polypropylene on the degree of surface anchoring of the macrocycle was shown. The catalytic activity of the hybrid materials produced in the oxidation reaction of sodium diethyldithiocarbamate was determined.     

Mechanism of thermal decomposition of the nonstoichiometric compound YBa<Subscript>2</Subscript>Cu<Subscript>3</Subscript>O<Subscript>6.8</Subscript>

Thermal decomposition of the nonstoichiometric high-temperature superconductor YBa₂Cu₃O_6.8 at a temperature of 200°C in air has been investigated using the full-profile analysis of X-ray diffraction lines. Two mechanisms of decomposition are revealed. The first mechanism, i.e., separation into two phases with a different oxygen content, occurs continuously. The second mechanism, i.e., disordering of the heavy atoms Y, Ba, Ba, Y along the crystallographic axis c, begins to occur after a 20- to 35-h annealing and progresses with a further annealing.