Generation and reaction of atomic metal anions in the gas phase. Determination of the heterolytic and homolytic bond energies for the vanadium, chromium, iron, cobalt, and molybdenum hydrides VH, CrH, FeH, CoH, and MoH

1985 ◽  
Vol 107 (15) ◽  
pp. 4379-4385 ◽  
Author(s):  
Larry Sallans ◽  
Kelley R. Lane ◽  
Robert R. Squires ◽  
Ben S. Freiser
Keyword(s):  
Gas Phase ◽  
Bond Energies ◽  
Phase Determination ◽  
Iron Cobalt ◽  
Metal Anions

The hydrogen bond energies of the bihalide ions XHX− and YHX−

1985 ◽  
Vol 63 (7) ◽  
pp. 1399-1406 ◽  
Author(s):  
G. Caldwell ◽  
P. Kebarle
Keyword(s):  
Hydrogen Bond ◽  
Gas Phase ◽  
Free Energies ◽  
Bond Energies ◽  
Solvation Energies ◽  
Complete Set ◽  
Lattice Energies ◽  
Gas Phase Ion ◽  
Hydrogen Bond Energies

Experimental measurements of the gas phase ion equilibria X− + HX = XHX−, X−(HX)n−1 + HX = X−(HX)n, and X− + HY = XHY where X, Y = Cl, Br, I, with a high pressure mass spectrometer, combined with the recent determination of F− + HF = FHF− by Larson and McMahon, provide a very complete set of hydrogen bond dissociation enthalpies and free energies for the hydrogen bihalide ions. The bond energy trends in the different XHX− and XHY− are discussed. The data can be used also for the evaluation of lattice energies of salts containing the bihalide ions and for determinations of the solvation energies of these ions.

scholarly journals THERMODYNAMIC PROPERTIES OF ORGANIC ACIDS AND SOME THEIR DERIVATIVES

2019 ◽  
Vol 62 (11) ◽  
pp. 38-45
Author(s):  
Vitaly V. Ovchinnikov ◽  
Alexey A. Kulakov ◽  
Irina G. Grigor′eva ◽  
Svetlana A. Maltseva
Keyword(s):  
Experimental Data ◽  
Organic Acids ◽  
Gas Phase ◽  
Thermodynamic Functions ◽  
Bond Energies ◽  
Additional Material ◽  
Electron Pairs ◽  
Valence Electrons ◽  
Heats Of Combustion

The heats of vaporization, combustion, formation, entropy and the heat capacities in different phases of different carbonic acids and their derivatives: acetates, esters with fatty radicals, two-, three- and four-basic acids (52 compounds) were analysed in the framework of one-parametric mathematic equations. The experimental data of all chosen one-, two-, three- and four-basic acids were analyzed. It was determined, that all thermodynamic functions of these types of compounds depend on the number of valence electrons N, from which the sum of lone electron pairs g as represented in the equations Δvap,c,fH° = i ±  f (N-g) and S°(Cp) = i ±  f (N-g) is excluded. The coefficients f in the first equations is in the range of 104-113 kJ mol-1 electron-1, that corresponds to the same values f in the equations, which are mentioned in our earlier papers on the determination of the heats of combustion of organic acids. As concerned of coefficient i in the received equations, necessary to note that situation is not synonymous as with the coefficient f. The magnitudes of this coefficient are different in the equations of vaporization, combustion, formation also as in the equations of entropy and the heat of capacity. On the base of literary experimental data we calculated the 29 new equations, which can be used for the calculation of the same thermodynamic functions for other new organic acids and especially bioorganic substances with the useful properties. Necessary to add, that the received equations can serve as additional material for the calculation of the bond energies of fatty acids and their derivatives in gas phase.

Fe3O4-based composite magnetic nanoparticles for volatile compound sorption in the gas phase: determination of selenium(iv)

The Analyst ◽  
2019 ◽  
Vol 144 (1) ◽  
pp. 152-156 ◽  
Author(s):  
Irina Timofeeva ◽  
Mariya Alikina ◽  
Anna Vlasova ◽  
Mikhail Osmolowsky ◽  
Mikhail Voznesenskiy ◽  
...  
Keyword(s):  
Magnetic Nanoparticles ◽  
Gas Phase ◽  
Volatile Compound ◽  
Hydride Generation ◽  
Phase Determination ◽  
On Line

On-line selenium separation based on hydride generation followed by sorption on magnetic nanoparticles.

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