Hydrogen bonds and protonation of carbonyl-containing polynuclear rhodium complexes

According to IR spectroscopy data, the interaction of bi-, tri-, and tetranuclear cyclopentadienylcarbonyl rhodium complexes with rather weak protic acids (phenols, fluoroalcohols) in low-polarity media results in the formation of hydrogen bonds of the OH...O=C type with bridged carbonyl groups. According to¹H NMR data, protonation of these complexes with strong acids (CF₃COOH and HBF₄) occurs at the the Rh-Rh bond to give the symmetrical bridge.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 2, pp. 386–388, February, 1995.This work was carried out with the financial support of the Russian Foundation for Basic Research (Project No. 93-03-0461).     

Excess molar enthalpies of the ternary mixture n-propanol + n-propyl acetate + water at 313.15 K

Journal of Thermal Analysis and Calorimetry - Excess molar enthalpies, H m E , for the ternary mixture n-propanol (n-PrOH) + n-propyl acetate (n-PrOAc) + water...     

The Formation of Cu(II) Complexes with Carbonate and Bicarbonate Ions in NaClO<Subscript>4</Subscript> Solutions

The inorganic behavior of most divalent metals in natural waters is affected by the formation of carbonate complexes. The acidification of the oceans will lower the carbonate concentration in the oceans. This will increase the concentration of free copper that is toxic to marine organisms. To be able to determine the effect of this acidification, reliable stability constants are needed for the formation of copper carbonate complexes. In this paper, the speciation of Cu(II) with bicarbonate and carbonate ions

Microscale investigation of surface contaminations during silicon epitaxial growth

Microchimica Acta - Epitaxial (epi) stacking faults on silicon wafers with &lt;100&gt;- and &lt;111&gt;-orientation were induced by intentional contamination with substances...     

Quantum-chemical study on the tautomerism of primary nitramines: the mechanism of N-nitro-anion protonation excludingaci-form formation

The values of the energy barriers to intramolecular 1,3-H shift reactions, in whichaci-forms of N- and C-nitro-compounds: 1 and are capable of transforming into 2 and , respectively, have been calculated by the semi-empirical AM1 method. The barrier heights (39 and 59.4 kcal/mol) reflect the kinetic stability of both tautomeric forms of the N- and C-nitro-compounds.Ab initio calculations in the 3–21G basis set of the structure and energies of stationary points on the potential energy surface of the system MeN=NO₂ H₃O demonstrated that there exists the principal possibility of the formation of only tautomer 2 (which is more stable than1).Translated fromIzvestiya Akademii Nauk, Seriya Khimicheskaya, No 1, pp. 100–104, January, 1993.     

Crystal structure,chemical stability and electrical properties of Sr2MnNbO6 − δ, Sr2Cr0.5Mn0.5NbO6 − δ and Sr2CuNbO6 − δ perovskites

Journal of Solid State Electrochemistry - The 3d-cation-substituted perovskites Sr2MnNbO6&nbsp;−&nbsp;δ, Sr2Cr0.5Mn0.5NbO6&nbsp;−&nbsp;δ and...     

Gas-tight proton-conducting Nd2 − xCaxZr2O7 − δ (x = 0, 0.05) ceramics

Journal of Solid State Electrochemistry - Gas-tight Nd2&nbsp;−&nbsp;xCaxZr2O7&nbsp;−&nbsp;δ (x = 0, 0.05) pyrochlore materials have been prepared via...     

Improving the combination of cellulose and lignin using xylan as a compatibilizer

Cellulose - Both&nbsp;cellulose&nbsp;and&nbsp;lignin&nbsp;are&nbsp;rich&nbsp;natural&nbsp;resources;&nbsp;however,&nbsp;recombining them&nbsp;to...     

Ab Initio Chemical Kinetics for the Thermal Decomposition of SiH4 + Ion and Related Reverse Ion–Molecule Reactions of Interest to PECVD of a-Si:H Films

Plasma Chemistry and Plasma Processing - The thermal unimolecular decomposition of SiH4 + ion and its related reverse reactions, SiH3 +&nbsp;+&nbsp;H and SiH2 +&nbsp;+&nbsp;H2, have...     

Electrochemical characterization of non-stoichiometric Cu2S x cathode for lithium batteries

Journal of Solid State Electrochemistry - Electrochemical performances of non-stoichiometric Cu2S x (1.25&nbsp;≤&nbsp;x&nbsp;≤&nbsp;0.625) cathodes prepared by spray...     

Phase transitions in binary system of n-heptane + water

Journal of Thermal Analysis and Calorimetry - We report the experimental studies of phase transitions in [xH2O&nbsp;+&nbsp;(1&nbsp;−&nbsp;x) C7H16] system with...     

A systematic study for the structures and properties of phosphorylated pulp fibers prepared under various conditions

Cellulose - A bleached softwood kraft pulp was phosphorylated with (NH4)2HPO4 and urea at 150&nbsp;℃ for 0‒40&nbsp;min, and the structures and properties of the resulting...     

Mg doping improving the cycle stability of LiNi0.5Mn0.5O2 at high voltage

Journal of Solid State Electrochemistry - A series of LiNi0.5-x Mg x Mn0.5O2 (0&nbsp;≤&nbsp;x&nbsp;≤&nbsp;0.1) samples are synthesized by a combination of...     

EFFECT OF POLYMORPHISM ON THE LUMINESCENT PROPERTIES ON SILVER(I) NITRATE COMPLEXES WITH 2-AMINO-5-PHENYLPYRAZINE

Journal of Structural Chemistry - The reaction between AgNO3 and 2-amino-5-phenylpyrazine (L) at a molar ratio Ag:L&nbsp;=&nbsp;1.5:1 (synthesis time 3-4&nbsp;h) in the acetonitrile...     

Thermoanalytical study of acetylacetonate-modified titanium(IV) isopropoxide as a precursor for TiO<Subscript>2</Subscript> films

Thermal decomposition of dried TiO₂ gel, obtained by hydrolysing acetylacetonate-modified titanium(IV) isopropoxide, was monitored by simultaneous TG/DTA/EGA-FTIR measurements in dynamic air up to 900&deg;C. XRD and FTIR were employed to identify the solid reaction products. Thermal degradation of the TiO₂ gel consists of five distinct mass loss steps, the total mass loss being 43.8&percnt;. EGA by FTIR revealed the release of H₂O below 120&deg;C; followed by acetone, isopropyl acetate and 1-propanol around 200-300&deg;C, and finally CO and CO₂ up to 550&deg;C. Highly exothermic reaction at 410-550&deg;C is caused by the combustion of carbon residues. Crystalline TiO₂-anatase is formed around 500&deg;C and TiO₂-rutile close to 800&deg;C.     

Measurement and correlation of isobaric densities and viscosities for endo-dicyclopentadiene with hydrocarbons (C6–C8) at different temperatures

Journal of Thermal Analysis and Calorimetry - Accurate experimental isobaric densities and viscosities data between 288.15 and 318.15&nbsp;K at 5&nbsp;K intervals for five binary liquid...     

Insights into the mechanism of binding of the gold(III) dithiocarbamate derivatives to cysteine or DNA purine bases

Structural Chemistry - Complexes Au(DMDT)Br2 (DMDT&nbsp;=&nbsp;N,N-dimethyldithiocarbamate), Au(ESDT)Br2 (ESDT&nbsp;=&nbsp;ethylsarcosinedithiocarbamate) and Au(ESDT)Cl2 are likely...     

Controlled nanosheet morphology of titanium carbide Ti3C2Tx MXene via drying methods and its electrochemical analysis

Journal of Solid State Electrochemistry - The different temperature drying processes were carried out at −60&nbsp;°C, 15&nbsp;°C, and 60&nbsp;°C to control the...     

Electrochemical and energy storage properties of layer-by-layer assembled vanadium oxide electrode-based solid-state supercapacitor in n+-SnO2:F/n-V2O5 heterostructure device form using ionic liquid gel electrolyte

Journal of Solid State Electrochemistry - Vanadium oxide film electrodes synthesized by layer-by-layer assembly using sol–gel spin casting and variable 3 &amp; 1&nbsp;h annealing...