Effect of methanol on the Lewis acidity of rutile TiO2 nanoparticles probed through vibrational spectroscopy of coadsorbed CO.

Infrared spectroscopy of adsorbed CO has been used to characterize the effect of adsorbed methanol on the Lewis acidity of 4 nm rutile TiO(2) nanoparticles. Measurements of CO absorbance and vibrational frequency have revealed that CO adsorbs primarily at one class of Lewis acid sites on clean TiO(2) particles, where evidence for lateral interactions between neighboring molecules suggests dense coverage occurs near saturation. The response of the CO infrared intensities and frequencies to methanol exposure has shown that methanol uptake occurs primarily at the Lewis acid sites and through hydrogen bonding to surface OH groups.

Electronic Chemistry Conferences: 7 years of CONFCHEM.

Between the summer of 1993 and August 2001, members of the ACS Division of Chemical Education's Committee on Computers in Chemical Education (CCCE) managed the online facilities for 17 online conferences. One more conference will occur during fall 2001, and several additional conferences are planned for the future. This article describes the history and the nature of these online conferences, including the advantages and disadvantages of the online format.