RH06 15min2:55
VIBRATIONAL PREDISSOCIATION OF Na+(CH3OH)m((CH3)2CO)n (m + n > 1; m, n \ge 1) FROM 2.5 TO 3.0 MICRONS..

C. J. WEINHEIMER AND J. M. LISY, Department of Chemistry, University of Illinois at Urbana-Champaign,Urbana, IL 61801.

The vibrational predissociation spectra of Na+(CH3OH)m((CH3)2CO)n (m + n > 1; m, n \ge 1), recorded between 3250 - 3800 cm-1, will be discussed and compared with clusters, Na+(CH3OH)m, that do not contain any acetone molecules (n=0). Acetone is not infrared active in this spectral region, but is capable of participating in strong hydrogen bonds with methanol. Any changes in the spectra between Na+(CH3OH)m and Na+(CH3OH)m((CH3)2CO)n can be attributed to the influence of one or more acetone molecules. As in the case of Na+(CH3OH)m clusters, the smaller cluster sizes show an absorption around 3670 cm-1, which is attributed to methanols with `free' O-H groups. Methanols acting as proton donors to other acetone or methanol molecules absorb below 3500 cm-1. The structural impact due to the presence of one or more acetones will be discussed.