The vapour-phase u.v. absorption spectrum of 1,2,5-thiadiazole near 2600 Å has been shown to be π→π* in nature and to involve a planar ground state and a non-planar excited state having a barrier to in version of ca. 461 cm–1.
E. Firkins and A. W. Richardson, J. Chem. Soc. D, 1971, 1368 DOI: 10.1039/C29710001368
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