| Abstract: | One-electron oxidation of two series of diaryldichalcogenides (C6F5E)2 (13a–c) and (2,6-Mes2C6H3E)2 (16a–c) was studied (E = S, Se, Te). The reaction of 13a and 13b with AsF5 and SbF5 gave rise to the formation of thermally unstable radical cations (C6F5S)2]˙+ (14a) and (C6F5Se)2]˙+ (14b) that were isolated as Sb2F11]– and As2F11]– salts, respectively. The reaction of 13c with AsF5 afforded only the product of a Te–C bond cleavage, namely the previously known dication Te4]2+ that was isolated as AsF6]– salt. The reaction of (2,6-Mes2C6H3E)2 (16a–c) with NO]SbF6] provided the corresponding radical cations (2,6-Mes2C6H3E)2]˙+ (17a–c; E = S, Se, Te) in the form of thermally stable SbF6]– salts in nearly quantitative yields. The electronic and structural properties of these radical cations were probed by X-ray diffraction analysis, EPR spectroscopy, and density functional theory calculations and other methods. |
