Chalcogen-bonded donor–acceptor complexes of 5,6-dicyano[1,2,5]selenadiazolo[3,4-<i>b</i>]pyrazine with halide ions

Abstract

With halides X − (X = Cl, Br, I) 5,6-dicyano-[1,2,5]selenadiazolo[3,4- b ]pyrazine 1 forms chalcogen-bonded complexes [1–X] − structurally defined by XRD. UV/Vis spectra of [1–X] − feature red-shifted charge-transfer bands in the Vis part.