The preparation of the MF6- (M = As, Sb) salts of 1,4-benzoquinodal bridged bis-1,3,2-dithiazolylium utilizing the cycloaddition and oxidative dehydrogenation chemistry of SNSMF6 and observation of a hybrid semiquinoidal-thiazyl radical-cation by EPR

SNSMF6 (M = As, Sb) reacts with 1,4-benzoquinone in a series of cycloaddition and oxidative dehydrogenation reactions to give 3 (MF6)(2) which on reduction with CsI yields the unique semiquinodal-thiazyl radical-cation (3(+center dot)) as observed by X-band solution ESR and supported by DFT calculations.