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The coordination chemistry of 2,2′-dipyridyldiselenide (PySeSePy) towards mangane­se, copper and zinc centres has been studied. The complexes [MnBr 2 -N,N′-(PySeSePy)] (1), [CuBr 2 -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(OOCC 6 F 5 ) 2 -N,N′-(PySeSePy)] (6) and [Zn (OSO 2 CF 3 ) 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  77 Se NMR experiments. The corresponding resonances are shifted downfield in comparison with the ligand.

zeitschrift für naturforschung b

Zur Koordinationschemie des 2,2′-Dipyridyldiselenids (PySeSePy), Teil 2 [1] Komplexe mit Mangan, Kupfer und Zink/ The Coordination Chemistry of 2,2′-Dipyridyldiselenide (PySeSePy), Part 2. Complexes with Manganese, Copper and Zinc