Carbon monoxide adsorption on nanosize ZnS has been investigated by FTIR spectroscopy and periodic DFT calculations. FTIR experiments show that CO adsorption on the zinc sulfide nanoparticles gives rise to a single main ν(CO) band indicating that the majority of the exposed sites are on the same surface. Computed adsorption energies (−0.244/–0.207 eV for the low and high coverage, respectively) and stretching frequencies (2182/2172 cm–1) of CO adsorbed at the most stable (110) ZnS surface are in excellent agreement with observations (ν(CO) = 2190/2168 cm–1). CO is weakly bound to the Zn2+ Lewis acid surface site mainly through electrostatic interaction and a small contribution from σ donation. The strength of surface Lewis sites in ZnS is lower with respect to ZnO.

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Partial molar enthalpies of solution of 11 systems [Me3BuN][NTf2] + methanol, + ethanol, + 1-propanol, + 1-butanol, + benzene and [EMIM][EtSO4] + methanol, + ethanol, + 1-propanol, + 1-butanol, + CHCl3, + H2O have been measured at 298.15 K in the mole fraction range 1% to 25% of the solutes using a precision titration calorimeter (Thermal Activity Monitor 2277, Thermometrics). The experimental results have been extrapolated to infinite dilution of the solutes in the ionic liquids. The partial molar enthalpies of solution at infinite dilution H i,∞ E obtained by this method have been compared with values derived from the temperature dependence of the activity coefficients at infinite dilution γ i,∞ which have been obtained by a gaschromatographic technique already published previously. Not for all systems studied agreement has been found within the experimental error limits of both methods indicating thermodynamic consistency of the results.

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