Publications

Abstract The gold (110)/perchloric acid interface was studied at temperatures ranging from 0.5 to 41° C by differential capacity-potential curves. The temperature coefficient of the Galvani potential drop was found to vary with the concentration of the solution, in contrast to what was observed for the (210) gold face. The azimuthal anisotropy and reconstruction of the gold (110) face make difficult interpretation in terms of a model of the variations of the entropy of formation of this interface. C1 (σ) curves with two round maxima were found. Comparison to result obtained with this gold face in KPF6 and the silver (110) face is discussed. The inner-layer capacity, at zero charge, for Au (110) in HClO4 is also discussed and the sign of its temperature coefficient is deduced from modified Parsons-Zobel plots. © 1987.

Abstract The standard (po = 101.325 kPa) molar enthalpies of combustion in oxygen 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 each of the three trihydroxybenzenes, 3-methoxycatechol, and 4-nitrocatechol: {A table is presented}. The derived standard molar enthalpies of formation of the gaseous compounds were compared with values estimated assuming that each group, when substituted into the benzene ring, produces a characteristic increment in the enthalpy of formation, with additional corrections for adjacent substituents. © 1986.

Abstract Theoretical calculations of the third virial coefficient for the pure components of all alkali metal vapours have been carried out using recently reported potential energy surfaces for the doublet and quartet states in which the interaction of three 2S ground-state atoms may evolve. The discrepancy between the theoretical and available experimental estimates for those coefficients is pointed out. © 1985.

Abstract At 298.15 K, the following standard molar enthalpies of formation of the crystalline solids were determined by solution-reaction calorimetry, and the enthalpies of sublimation were measured by microcalorimetry. {A table is presented} (PD, pentan-2,4-dionato; piprm, 2,2-dimethylheptan-3,5-dionato; dibm, 2,6-dimethylheptan-3,5-dionato; ibpm, 2,2,6-trimethylheptan-3,5-dionato; dpm, 2,2,6,6-tetramethylheptan-3,5-dionato.) The mean molar bon-dissociation enthalpy <D>(CuO) was related to D(OH) in the enol form of the diketone, and {<D>(CuO)-0.5D(OH), Hl, enol} was found to equal -(41.8 ± 2.0) kJ · mol-1, constant to within experimental error for all these complexes. Accepting {D(OH), Hl, enol} = (400 ± 20) kJ · mol-1, then <D>(CuO) = (158 ± 10) kJ · mol-1 showing a negligible effect of methyl substitution in the ligand l upon <D>(CuO). © 1984.

Abstract The standard (po = 101.325 kPa) molar enthalpies of combustion in oxygen 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 1,2-dihydroxybenzene (catechol) and six alkylsubstituted catechols: {A table is presented}. The increment in the molar enthalpy of formation of the gaseous compound for substitution of alkyl-groups into catechol was found to be approximately the same as the corresponding increment for substitution into benzene. © 1984.