Publications

Abstract The origin of experimental high frequency artifacts in the measurement of the ac impedance of the interface between immiscible electrolytes is discussed. Different cell designs have been tried and it is concluded that the main origin of the observed high frequency dispersion is the high value of the resistance of the Luggin capillary in the organic phase. The use of a Ag/AgTPB reference electrode appears to obviate these problems. © 1990.

Abstract The standard (po = 0.1 MPa) molar enthalpies of combustion, in oxygen, at 298.15 K, were measured by static bomb calorimetry for three 8-hydroxyquinolines; the vapour pressures of the crystals were measured as functions of temperature by the Knudsen-effusion technique, and the standard molar enthalpies of sublimation, at 298.15 K, were derived by the Clausius-Clapeyron equation. Direct measurements of the standard molar enthalpies of sublimation using micro-calorimetry confirmed the values from the Knudsen technique. {A table is presented}. © 1989.

Abstract The standard (po = 0.1 MPa) molar enthalpies of combustion in oxygen at 298.15 K were measured by static-bomb calorimetry for some quinones and dihydroxyquinones. The standard molar enthalpies of sublimation at 298.15 K were measured by microcalorimetry for 1,4-naphthoquinone and 9,10-phenanthraquinone; values were selected from the literature for the remaining compounds in order to derive the standard molar enthalpies of formation in the gaseous state. {A table is presented}. The energies of the intramolecular hydrogen bonds in the dihydroxyquinones were assessed as (25 ± 3) kJ·mol-1. 1,4,9,10-Anthradiquinone is apparently considerably strained, and although its reaction with water produces 1,4-dihydroxy-9,10-anthraquinone, a concomitant formation of hydrogen peroxide is shown to be thermodynamically improbable. © 1989.

Abstract The standard (po = 0.1 MPa) molar enthalpies of combustion in oxygen at 298.15 K of crystalline thiobenzamide, N, N-dimethylthiobenzamide, and N, N-diethylthiobenzamide to produce CO2(g), N2(g), and H2SO4·115H2O(l) were measured by rotating-bomb calorimetry. The standard molar enthalpies of sublimation at 298.15 K were measured by microcalorimetry. {A table is presented}. These results form the basis of a bond-energy scheme to estimate ΔfHmo(C6H5CSNr2, g). © 1989.

Abstract The standard (po=0.1 MPa) molar enthalpies of combustion at 298.15 K were measured by static-bomb calorimetry and the standard molar enthalpies of sublimation at 298.15 K were measured by microcalorimetry for three benzylidene t-butylamine N-oxide derivatives and for 4-nitrobenzylidine t-butylamine: {A table is presented}. From the standard molar enthalpies of formation of the gaseous compounds, the molar dissociation enthalpies of the (NO) bonds were derived, and these were found to be constant within experimental error to give a weighted mean value: D(NO)/(kJ·mol-1) = (285.9 ± 3.6). © 1989.

Abstract The trajectory calculations of the alkali-metal atom + alkali-metal dimer reactions initiated in a previous work have been extended to the Li + Li2 system using two different potential-energy surfaces for the Li3 trimer. The results agree well with each other and with previous results by other authors, suggesting a statistical mechanism for this exchange reaction.