John M. Millar

Surface chemistry on transition metal colloids—an infrared and NMR study of carbon monoxide adsorption on colloidal platinum

Highly dispersed (<10{angstrom}) platinum has been prepared in colloidal solution by condensing platinum vapor into a solution of triisobutylaluminoxane in methylcyclohexane. Carbon monoxide, adsorbed in a linear mode on the surface of the colloidal metal, has been characterized by infrared spectroscopy and {sup 13}C NMR. The chemical shift of the adsorbed CO is 192 ppm, and the absence of a Knight shift is interpreted in terms of a pseudomolecular description of the highly dispersed platinum particles, which are not large enough to exhibit metallic properties. The CO covered colloid is converted by hydrolysis into the molecular platinum carbonyl anion clusters (Pt{sub 3}(CO){sub 6}){sub n}{sup 2 {minus}}, n = 3, 4.

Chromatographic separations of fullerenes : discovery and characterization of C60 mono-epoxide

Abstract A semi-preparative scale high-pressure liquid chromatographic method for the separation of the fullerene extract components has been developed. During the course of these separations, a new fullerene species was isolated and characterized by mass spectrometry, 13C NMR, and infrared and UV-Vis absorption spectroscopy. Mass spectrometry identifies this component as the mono-oxygen adduct of C60 (C60O) and 13C NMR strongly supports the epoxide structure rather than the isomeric oxido-annulene structure. In addition, the effects of different solvents on the optical absorption spectra of purified C60 and C70 and crystalline properties of C60 fullerite powder are reported.

The absence of ‘globe-trotting’ hydrogen on the surfaces of aminated fullerenes: 3-D hydrogen bonding between aminated fullerenes and water revealed

Unusual temperature dependencies in the 1HNMR spectra of aminated fullerenes, previously attributed to ‘globe-trotting’ hydrogen, are in fact due to temperature and dilution dependent hydrogen bonding interactions with water.

C 60 And C 70 : Here’s Looking at you

In this paper we will describe the production, separation and characterization of the new all carbon molecules, C 60 and C 70 . High performance liquid chromatography HPLC is used to obtain purified samples of C 60 and C 70 , which are subsequently characterized by electron impact and chemical ionization mass spectrometry, IR and UV-visible absorption spectroscopy, NMR, ESR, scanning tunnelling microscopy, transmission electron microscopy and x-ray absorption fine structure measurements.