Assignment of the 290-nm electronic band system of indazole [1,2-benzodiazole] as π*-π by rotational band contour analysis

摘要: Abstract The 0 band of the S 1 - electronic absorption system indazole at 290 nm has been analyzed, and results computer simulation its rotational contour have shown that this is A B hybrid with an intensity ratio = 1.22 . assigned as ′(ππ ∗ )- X A′ same result already reached for benzimidazole (E. Cane et al., J. Mol. Spectrosc. 150 , 222–228 (1991)), other ring-condensed aza-aromatic compounds although relative amount type components different in each band. transition moment molecular plane nearly equidistant from a b -inertial axes ( θ ±42°).