Recovery of perrhenate ions with a macrocellular anion exchanger based on epoxidized monoethanolamine vinyl ether, allyl glycidyl ether, and polyethyleneimine

Sorption of perrhenate ions by a new anion exchanger based on epoxidized monoethanolamine vinyl ether, allyl glycidyl ether, and polyethyleneimine was studied. It was found that the anion exchanger has a high sorption capacity for rhenium ions.     

New thioterpenoids based on carvone

Reactions of carvone with mercaptoacetic acid and its esters in the presence of ZnCl₂ were studied. New menthane-type thioterpenoids were produced. __________ Translated from Khimiya Prirodnykh Soedinenii, No. 6, pp. 564–565, November–December, 2006.     

Electrically weak fermi particle interaction with a plane wave field taking account of the anomalous magnetic moment

The process of neutrino generation by neutrons n n n(vV)due to interaction of the neutron anomalous magnetic moment with a circularly polarized plane wave field is examined. Using the invariant solution of the generalized Dirac equation, an expression is obtained for the total probability of the process consisting of four contributions. Energetic asymptotics of the results are analyzed and estimates are made of the possibility of observing the effect under laboratory conditions.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 9, pp. 91–97, September, 1989.The authors are grateful to V. G. Bagrov for valuable remarks.     

Semiconductor Sensors Based on SnO<Subscript>2</Subscript> with Pt Additives and their Catalytic Activity in Oxidation of Methane

We have studied the effect of small additives of Pt on the methane sensitivity of semiconductor adsorption sensors based on SnO₂ (doped with Sb₂O₅) and on the catalytic activity of sensor materials of the same composition in oxidation of methane. We have shown that as the amount of Pt increases, the catalytic activity increases and the sensitivity of the sensors passes through a maximum. The results obtained are explained taking into account the spillover phenomenon.__________Translated from Teoreticheskaya i Eksperimental’naya Khimiya, Vol. 41, No. 3, pp. 176–179, May–June, 2005.     

Investigations of condensed heteroaromatic systems including a thiophene ring

The electronic absorption and fluorescence spectra of a number of condensed heteroaromatic compounds containing a thiophene ring were studied. In connection with the fact that the theoretical treatment of the closeness of the electronic structure of thiophene and benzene molecules is based, in particular, on the similarity between the electronic absorption spectra of thiophene-containing systems and their polycyclic aromatic analogs, the spectra of the investigated compounds were compared with the corresponding polycyclic aromatic hydrocarbons. It was demonstrated that the differences introduced by the thiophene ring depend on the length of the chain of condensed benzene rings in the molecules of the thiophene-containing systems. The results can be used to analyze mixtures of such compounds.See [1] for communication XX.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 7, pp. 925–932, July, 1972.     

Quantum-Chemical Simulation of the Proton Transport in Mono- and Disubstituted Salts with Octahedral Anions

Salts Rb₂H₃IO₆, Rb₄H₆I₂O₁₂, and Rb₄H₂I₂O₁₀ and adducts CsHSO₄· H₆TeO₆ and Cs₂SO₄· H₆TeO₆ of the salt · acid type are calculated within density functional theory B3LYP. Calculations for Te, I, Rb, and Cs atoms make use of basis set LanL2DZ complemented by polarization d,p-functions and pseudopotential LanL2; for Li, O, and H atoms, basis set 6-31G** is used. The activation energy for the proton migration is commensurate with that for the water molecule abstraction in the salts and is smaller in rubidium salts than in cesium salts.     

Volumetric properties of methyl,tert-butyl, and alkoxy derivatives of tetraphenylporphyrin in benzene solution

Densities, apparent molar volumes, and partial molar volumes of benzene solutions ofmeso-tetradimethylphenyl porphyrin derivatives H₂T(i,j-CH₃)PP (where i,j = 2,3-; 2,4-; 3,4-; 2,5-; 3,5-);meso-tetra-4-alkoxyphenyl porphyrin derivatives H₂T(4-OC_nH_2n+1)PP (wheren = 2–4,6–8,10,12,16);meso-tetra-3-butoxyphenyl porphyrin H₂T(3-OC₄H₉)PP;meso-tetra-4-tert-butylphenyl porphyrin H₂T(4tBu)PP;meso-tetra-3,5-ditert-butylphenyl porphyrin H₂T(3,5-tBu)PP at 25°C and tetraphenylporphyrin, H₂TPP,H₂T(4-OC₁₀H₂₁)PP;H₂T(4-OC₁₂H₂₅)PP and H₂T(4tBu)PP at 20°C; 30°C; 40°C; 50°C were determined. The solubilities of the compounds in benzene at 25°C were measured. The solvent excluded volumes for different conformational states and the topology of dimethyl derivatives of tetraphenylporphyrin were calculated and compared with partial molar volume data. The correlation between the partial molar volumes and van der Waals volumes for the derivatives H₂TPP,n-alkanes,n-alkanols, fatty acids, cyclic compounds, and crown ethers using the equation of Terasawa was elaborated. The average increment of the methylene group for alkoxy-substituted H₂TPP was calculated as δV ₂ ^o (CH₂) = 16.6±0.4cm³-mol^-1. The volumetric expansion coefficients of benzene solutions of H₂TPP; H₂T(4-OC₁₀,H₂₁)PP; H₂T(4-OC₁₂H₂₅)PP and H₂T(4-tBu)PP were determined and discussed. The importance of packing efficiencies around the solute molecules were examined.     

Luminescent kinetic determination of uranium mass fraction in plutonium

Measurement of lifetime along with measurement of intensity allow to determine both uranium and plutonium concentrations. If exciting light absorption is taken into account and temperature correction is introduced the intensity of uranyl limunescence extrapolated to zero time is a function of uranium and the ratior ₀/r-a function of plutonium concentration. Stadi of characteristics of uranyl luminescence was performed using a spectrometer interfased with a microcomputer. Luminescence was excited by nitrogen laser.