# $\bar{a} {^{3}}B_{3u}-\widetilde{X} {^{1}}A_{g_{1}}$ AND $\bar{A} {^{1}}B_{3u}-\widetilde{X} {^{1}}A_{g}$ ELECTRONIC TRANSITIONS OF s-TETRAZINE

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 Title: $\bar{a} {^{3}}B_{3u}-\widetilde{X} {^{1}}A_{g_{1}}$ AND $\bar{A} {^{1}}B_{3u}-\widetilde{X} {^{1}}A_{g}$ ELECTRONIC TRANSITIONS OF s-TETRAZINE Creators: Livak, D. T.; Franks, L. A.; Innes, K. K. Issue Date: 1968 Publisher: Ohio State University Abstract: Hochstrasser and $Marzzaco^{1}$ recently identified the lowest-energy triplet-singlet absorption of crystalline dimethyltetrazine. The 0-0 band lies at $7626 {\AA}$, giving an apparent $(\pi^{*}, n)$ singlet-triplet splitting of $4000 cm^{-1}$. Using a path of about one meter-atmosphere of vapor, we have found 20 bands of the analogous absorption by s-tetrazine. The 0-0 band lies at $7346 {\AA}$ so that the singlet-triplet splitting is in this case $4520 cm^{-1}$. A striking difference in the singlet and triplet systems of tetrazine is that in the $\bar{a}-\widetilde{X}$ system the origin band is one of the weakest while in the $\tilde{A}-\widetilde{X}$ system the origin band is one of the strongest. Accordingly it will be of interest to discuss the vibrational structures in some detail. Description: This research was supported by the National Science Foundation. $^{1}$ R. M. Hochstrasser and C. Marzzaco, J. Chem. Phys. 46, 4155 (1967). Author Institution: Department of Chemistry, Vanderbilt University URI: http://hdl.handle.net/1811/15409 Other Identifiers: 1968-B-3