VIBRATIONAL PREDISSOCIATION OF $Na^{+}$($CH_{3}OH)_{m}((CH_{3})_{2}CO)_{n}$ (m+n $>$ 1; m,n $\geq$ 1) FROM 2.5 TO 3.0 MICRONS
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Date
1996
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Ohio State University
Abstract
The vibrational predissociation spectra of $Na^{+}$ ($CH_{3}OH)_{m}((CH_{3})_{2}CO)_{n}$ (m + n $>$ 1; m, n $\geq$ 1), recorded between 3250 - $3800 cm^{-1}$, will be discussed and compared with clusters, $Na^{+}$ ($CH_{3}OH)_{m}$, 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 change in the spectra between $Na^{+}(CH_{3}OH)_{m}$ and $Na^{+}(CH_{3}OH)_{m}((CH_{3})_{2}CO)_{n}$ can be attributed to the influence of one or more acetone molecules. As in the case of $Na^{+}(CH_{3}OH)_{m}$ clusters, the smaller cluster sizes show an absorption around $3670 cm^{-1}$, which is attributed to mathanols 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.
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Author Institution: Department of Chemistry, University of Ellinois at Urbana-Champaign