Electrochemical synthesis of tetrakis[N-methylbenzothiazole-2(3H)-selone]selenium(2+) tetrafluroborate: an uncommon dication containing the mixed-valence Se5 framework

The electrochemical oxidation o N-methylbenzothiazole-2(3H)-selone leads to tetrakis[Nmethylbenzothiazole-2(3H)-selone]selenium(2+) tetrafluoroborate showing an uncommon dication containing a non-cyclic square-planar Se5 framework; both Mulliken and NBO population analyses explain the relatively long Se–Se bond lengths between the central and the peripheral selenium atoms.