FLUORESCENCE-DIP INFRARED SPECTROSCOPY OF THE TROPOLONE-$H_{2}O$ COMPLEX
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Date
1996
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Publisher
Ohio State University
Abstract
Fluorescence-dip infrared spectroscopy (FDIRS) is used to probe the effect of solvent binding by water on the intramolecular H-atom tunneling in tropolone. As with the bare molecule in the adjoining presentation, the FDIR spectrum of the jet-cooled tropolone-$H_{2}O$ complex is recorded in the O-H and C-H regions. The spectrum possesses distinct absorptions due to the water free OH, water hydrogen-bonded OH, and tropolone OH. Extensive ab initio calculations on tropolone-$H_{2}O$ are carried out at both the MP2 and Becke3LYP levels of theory. Two isomers for the complex are identified with binding energies and vibrational frequencies quite similar to one another. The experimental evidence does not conclusively distinguish between these two possibilites, though discussion will focus one that is more keeping with the data as a whole.
Description
Author Institution: Department of Chemistry, Purdue University; Department of Chemistry, University of Pittsburgh