Abstract
The coordination chemistry of 2,2′-dipyridyldiselenide (PySeSePy) towards manganese, copper and zinc centres has been studied. The complexes [MnBr2-N,N′-(PySeSePy)] (1), [CuBr2-N,N′-(PySeSePy)] (2), [Cu-(μ-Br)-N,N′-(PySeSePy)]2 (3), [Cu-(μ-Br)-{μ-N,N′-(PySeSePy)}]n (4), [Cu-(μ-Cl)-N,N′-(PySeSePy)]2 (5), [Zn(OOCC6F5)2-N,N′-(PySeSePy)] (6) and [Zn (OSO2CF3)2-N,N′-(PySeSePy)] (7) have been synthesised and the crystal structures of 1, 3, 4 and 6 determined. 1, 3 and 6 display seven-membered metallacycles with tetrahedral coordination of the metal centres. In these cases 2,2′-dipyridyldiselenide acts as a chelating ligand. In the polymeric complex 4, 2,2′-dipyridyldiselenide acts as a bridging ligand. All com plexes display selenium-selenium single bonds with an average length of 232 pm. In contrast to the analogous chloro and nitrato complexes, the zinc complexes 6 and 7 are not dissociated in solution, as evidenced by 77Se NMR experiments. The corresponding resonances are shifted downfield in comparison with the ligand.
© 1946 – 2014: Verlag der Zeitschrift für Naturforschung