Cyclopentadienylchromium complexes of 1,2,3,5-dithiadiazolyls:: η2 π complexes of cyclic sulfur-nitrogen compounds

(Figure Presented) Diamagnetic π complexes are formed in the reaction between [{CpCr(CO)3}2] and dithiadiazolyl dimers [S 2N2CR]2 (R = substituted phenyl rings) in which the heterocycles are η2-coordinated to the metal in endo (depicted) or exo fashion. The isomers interconvert in solution at room temperature. These complexes are remarkable for retaining intact the S-S bonds of the dithiadiazolyl radicals (C gray, H white, O red, Cr purple, S yellow, N blue, Cl green). © 2006 Wiley-VCH Verlag GmbH & Co. KGaA.