Novel chalcogen–nitrogen systems

Reaction of (Me3SiNSN)2Se with [Pd2X6]2- (X = Cl, Br) results in the formation of [Pd2X4(Se2N2S)]2-, the first examples of complexes of the novel [Se2N2S]2- ligand. In the products this ligand acts as a bidentate bridge via the two selenium atoms. The crown thio-ether [14-ane]S4 reacts with [Pd2X6(S2N2)]2- to liberate S2N2 which in turn dimerises to S4N4. Analogous reaction of adducts of Se2N2 does not initially liberate the nitride; a longer reaction time does succeed in this aim. The ultimate fate of the Se2N2 has not been ascertained, however, although dimerisation to Se4N4 does not appear to take place. [Continues.]