Sitzmann, Helmut; Saurenz, Dirk; Wolmershaeuser, Gotthelf; Klein, Axel; Boese, R.:

Bis(tetraisopropylcyclopentadienylnickel)dichalcogenides: Complexes of the Novel [{CpME}2] Type (E = S, Se, Te).

In: Organometallics, Jg. 20 (2001) ; Nr. 4, S. 700-705
ISSN: 0276-7333
Zeitschriftenaufsatz / Fach: Chemie
The dinuclear dichalcogenides [{(C5HR4)NiE}2] (R = CHMe2; E = S (2), Se (3), Te (4)) have been synthesized from [{(C5HR4)NiBr}2] (1) (R = CHMe2) and the corresponding disodium dichalcogenides. Crystal structure analyses show four-membered Ni2E2 rings with weak, but significant E...E interaction. 1-4 Were characterized electrochem. and reveal nickel-centered oxidns., bridging ligand-centered redns., and the formation of mixed-valent Ni(II)/Ni(III) species.