ELECTRONIC TRANSITIONS TO THE LOWEST $n\Pi^{*}$ SINGLET STATES OF HYDROGEN BONDED TRIAZENE AND TETRAZINE
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Date
1978
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Ohio State University
Abstract
This report summarizes our study of transitions to the lowest $n\Pi^{*}$ singlet states of hydrogen bonded monocyclic azines. Using fluorinated alcohols, it is found that like pyrimidene and pyridazine, the absorption spectrum of hydrogen bonded s-triazine is broad and structureless. This is interpreted to mean that all hydrogen bonded complexes of these molecules are unstable in $n\Pi^{*}$ states. By contrast the $n\Pi^{*}$ absorption spectrum of hydrogen bonded tetrazine retains considerable, detailed, vibronic structure in a manner similar to pyrazine. Results to date indicate that not only is the singly hydrogen bonded tetrazine complex stable in the lowest $n\Pi^{*}$ excited state, but other complexes rosy be stable as well. A discussion of the vibronic spectrum of the lowest $n\Pi^{*}$ state of hydrogen bonded tetrszine will be given. The effect of hydrogen bonding on vibrational frequencies in this state will also be discussed.
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Author Institution: Department of Chemistry