- Generation and 355 nm laser photodissociation of nitrous acid (HONO) and HONO-water clusters
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A stable source for the continuous production of high concentrations of gaseous nitrous acid (HONO) up to 5000 ppm has been developed, characterized, and employed for a study of the near-UV photodissociation of HONO and HONO-water clusters in a continuous supersonic free-jet expansion. The source consists of a flow reactor fed with aqueous reagent solutions purged by an inert carrier gas at flow rates up to 1 L/min. The dynamics of the photodissociation of jet-cooled HONO and HONO-water clusters at 355 nm have been studied by measuring the rotational distribution of the nascent NO (ν″ = 2) photofragment using the laser-induced fluorescence (LIF) technique. Distinctly bimodal rotational distributions have been observed for the nascent, vibrationally excited NO, which are well described by the sum of two components: a Gaussian distribution at high J and a 170 K Boltzmann distribution in the low-J range reflecting photodissociation of bare HONO , HONO-H2O complexes, and small HONO water clusters.
- Ning,Pfab
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- Cu-Pd bimetallic cluster/AC as a novel catalyst for the reduction of nitrate to nitrite
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Cu-Pd/AC catalysts that are derived from Cu-Pd clusters were shown to possess high activity for the reduction of nitrate to nitrite, but were inactive for the reduction of nitrite. In contrast, the Pd/AC catalyst was inactive for the reduction of nitrate, whereas conventional Cu-Pd/AC afforded various products, including nitrite, nitrogen, and ammonia.
- Sakamoto, Yoshinori,Nakata, Kou,Kamiya, Yuichi,Okuhara, Toshio
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- Hydrogen evolution assisted electrodeposition of porous Cu-Ni alloy electrodes and their use for nitrate reduction in alkali
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Porous Cu-Ni alloys with a wide range of compositions have been deposited from citrate baths containing the two metal ions, under application of large current densities (-3 A cm-2) leading to vigorous hydrogen evolution. The deposited alloy layers show macroscopic porosity and a spongy material made of a network of tiny dendrites. Porous RDEs reveal a significant current increase - as compared to ordinary polished electrodes - in the fast ferrocyanide reduction under pure mass transport control. Voltammograms of nitrate reduction in alkali at porous RDEs show at all potentials larger currents in comparison with experiments at compact electrodes of same composition. Electrolyses at porous sheet electrodes show large stable currents, leading to fast and selective nitrate reduction to ammonia.
- Mattarozzi, Luca,Cattarin, Sandro,Comisso, Nicola,Gambirasi, Arianna,Guerriero, Paolo,Musiani, Marco,Vázquez-Gómez, Lourdes,Verlato, Enrico
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- Radiolysis products of nitrate-acetate aqueous solutions and their influence on pH of the solutions
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The influence of the components of nitrate-acetate aqueous solution and products of their radiolysis on pH of the solutions was experimentally studied in a wide dose range. The results can be used to estimate the speciation and migration conditions of radionuclides in a reservoir bed of underground disposed sites of liquid radioactive waste. 2005 Pleiades Publishing, Inc.
- Egorov,Danilin,Zakharova,Darskaya,Zubkov
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- Method for preparing alkyl nitrites
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The invention concerns a method for preparing alkyl nitrites of formula (I) R ONO (I) ONO wherein R represents a C1-C20, advantageously C2-C10 linear or branched alkyl group. The invention is characterised in that it consists in gradually and continuously adding in an aqueous medium, an alcohol of formula (II) R OH, R being as defined above, a nitrite of formula (III) M NO2, wherein M represents a metal cation, and a strong acid, so as to form continuously said alkyl nitrite, and in continuously drawing off said alkyl nitrite thus formed from the reaction medium.
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- Process for producing saleable liquids from organic material
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A process for producing saleable liquids from organic material comprising the following steps. Providing organic material and separating it into solids, liquids and vapour. Reacting the liquids, combining it with water vapour and producing a volatized gas stream. Removing nitrogen dioxide from the gas stream to produce a scrubbed volatized gas stream. Reacting the scrubbed volatized gas stream with water vapour to produce a combined volatized gas stream. Removing carbon dioxide from the combined volatized gas stream to produce a subtracted volatized gas stream. Reacting the subtracted volatized gas stream with methanol to produce an enhanced volatized gas stream. Distilling the enhanced volatized gas stream to produce ethanol.
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- Infrared spectrum of the hyponitrite dianion, N2O22-, isolated and insulated from stabilizing metal cations in solid argon
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Ultraviolet irradiation of a rigid 7 K argon matrix containing alkali or alkaline earth metal atoms and (NO)2 isolated from each other by one or two layers of argon forms N2O22- dianions insulated from two M+ cations by argon atoms, and visible photolysis reverses this electron-transfer process likely involving the N2O2- anion intermediate. The isolated N2O22- dianion is identified from isotopic substitution and isotopic mixtures, which show that the new 1028.5 cm-1 metal independent absorption involves two equivalent NO subunits. DFT calculations predict a strong 1078.1 cm-1 fundamental for the Li(NO)2Li molecule and isotopic frequency ratios in excellent agreement with the observed values, which provides a model for the matrix dianion system. The spectrum of solid Na2N2-O2, exhibits a 1030 cm-1 infrared band, which strongly supports the present N2O22- dianion assignment. The electrostatic stabilization of N2O22-, which is probably unstable in the gas phase, is made possible by metal cations separated by one or two insulating layers of argon in the rigid 7 K matrix.
- Andrews,Liang
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p. 1997 - 2002
(2007/10/03)
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- Preparation of azo colorants in microreactors
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Azo colorants are prepared by conducting the diazotization of aromatic or hetaromatic amines or the azo coupling reaction or the diazotization and the azo coupling reaction in a microreactor.
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- A Methylene-Bridged Dialuminium Compound as a Chelating Lewis Acid: Complexation of Nitrite and Nitrate Anions by R2Al-CH2-AlR2 [R = CH(SiMe3)2]
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Sodium nitrite (NaNO2) dissolves readily in THF, when the methylene-bridged dialuminium compound R2Al-CH2-AlR2 [R = CH(SiMe3)2] 1 with two coordinatively unsaturated aluminium atoms is adde
- Uhl, Werner,Hannemann, Frank,Saak, Wolfgang,Wartchow, Rudolf
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p. 921 - 926
(2007/10/03)
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- 4,5-bridged-2,3,4,5-tetrahydro-1H-3-benzazepine-7-ols and derivatives and compositions and methods employing such compounds
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Novel benzazepines of the formula I: STR1 or a pharmaceutically acceptable salt thereof, wherein R represents H, alkyl, allyl or STR2 A represents --[CR1 R2]n --; n represents 3 or 4; R1 and R2 may be the same or different and each independently represents H, OH, atkyl, alkoxy, phnenyl or substituted phenyl, with the proviso that R1 and R2 on the same carbon atom are not both OH, or R1 and R2 on the same carbon atom together represent=O; G represents H, R3 (CO)-- or ArNHCO--; R3 represents H, alkyl, alkoxy, phenyl or substituted phenyl; Ar represents phenyl or substituted phenyl; and Y and Z may be the same or different and each is independently selected from H, halo, alkyl, alkoxy or halpalkyl; the pharmaceutically acceptable salts thereof, and pharmaceutical compositions thereof, useful in the treatment of psychoses, drug dependence, D1 dependent neurological disorder or pain are disclosed.
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- Assimilatory and Dissimilatory Reductions of NO-n (n=2, 3) Catalyzed by MoFeS Cluster
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Nitrate and nitrite ions are selectively reduced to NH3 by a (Bu4N)42-modified glassy carbon electrode under the electrolysis at -1.25 V vs.SCE in H2O (pH 10.0), while nitrite ion is predominantly reduced to N2 under the same electrolysis at -1.00 V.
- Tanaka, Koji,Matsui, Tatsuji,Tanaka, Toshio
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p. 1827 - 1830
(2007/10/02)
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- Thermal Decomposition of Sodium trans-Hyponitrite
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Samples of amorphous sodium trans-hyponitrite (Na2N2O2), heated with a continuous rise in temperature in the absence of oxygen, decompose suddenly between 360 and 390 deg C.The decomposition products are Na2O and N2O, along with secondary reaction product
- Abata, J. D.,Dziobak, M. P.,Nachbor, M.,Mendenhall, G. D.
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p. 3368 - 3372
(2007/10/02)
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- ON THE ELECTRICAL PROPERTIES OF POLYCRYSTALLINE DELAFOSSITE-TYPE AgNiO2.
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AgNiO//2 is prepared by reaction of molten silver nitrate with NaNiO//2. Powder X-ray diffraction shows that the compound has the delafossite structure of space group R OVER BAR 3m. Magnetic data give evidence for the localization of the 3d-electrons of most Ni atoms. Electrical conductivity and thermoelectric measurements performed between 4. 2 and 300 K on polycrystalline samples show that AgNiO//2 behaves like a semimetal. N-type and p-type charge carriers are created by a slight overlapping of the d band of silver atoms with the sigma antibonding band resulting from the overlapping of the Ni 3d- and O 2p-orbitals.
- Wichainchai,Dordor,Doumerc,Marquestaut,Pouchard,Hagenmuller
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p. 126 - 131
(2008/10/08)
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- Hydrolysis of Di- and Trimesylhydroxylamines and their Methylated Derivatives
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The mesylhydroxylamines (CH3SO2)2NOH, (CH3SO2)2NOCH3, CH3SO2N(H)OSO2CH3, CH3SO2N(CH3)OSO2CH3 (1-4) and (CH3SO2)2NOSO2CH3 (5) were treated with basic, neutral, and acidic aqueous solutions.The reaction products were identified.Possible decomposition mechanisms were discussed.
- Brink, Klaus,Mattes, Rainer
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p. 351 - 354
(2007/10/02)
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- Preparation of benzotriazoles
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This invention relates to a process for producing benzotriazoles which comprises effecting a mixture in an aqueous medium of at least one aromatic orthodiamine and one or more nitrites and heating the mixture to temperatures ranging up to about 350° C. while maintaining pressures at levels sufficient to keep effective amounts of water present for the reaction.
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