Thianthrene cation radical, structure

The structure of the thianthrene cation radical is shown in structure 1 as Th +. Its electron spin and charge are fully delocalized (2), yet reactions with nucleophiles occur principally at one of the sulfur atoms (3). Therefore,... 

Figure 17. 1,4-Dithiin 21 and the molecular structure of its radical-cation salt 2f+SbF6 determined by X-ray crystallography. The observed lengths (A) of Cl-S and C1-C2 in 2f+SbF6 are 1.72(1) and 1.31(2) to be compared with 1.324(3) and 1.760(2) determined for neutral 21, respectively. Also shown is the thianthrene radical cation 23 +. 

Fluorescence was used to investigate the excited-state dynamics of the radical cation of thianthrene (TH ) <2001PCA6594>. The frequencies of the fundamental modes of the molecules of some dioxins in the ground electronic state were also determined by analysis of their fine-structure phosphorescence spectra <19990PS(86)239, 19970PS(83)92, 20000PS(89)42, 20000PS(88)339>. 

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