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Tripledecker Complexes, VIII. - Electrophilic Stacking Reactions of Borataferrocene and Bis(borole)cobaltate Ions with Tricarbonylmetal Fragments of Chromium and Manganese Group Metals
Herberich, Gerhard E.,Koeffer, Dieter P. J.,Peters, Karl M.
, p. 1947 - 1952 (2007/10/02)
Bis(borole)cobaltate ions (1-) (1-) and borataferrocene ions (1-) (2-) (a: L = C4H4BMe; b: L = C4H4BPh) readily undergo stacking reactions.When treated with sources of chromium group M(CO)3 fragments 1b- and 2b- form 30-e tripledecked anions >(1-) ( M = Cr, Mo, W) (3- - 5-) and >(1-) (M = Cr, Mo, W) (6- - 8-).These 30-e anions are very sensitive to nucleophilic degradation by e.g. water, acetonitrile and to a lesser extent acetone.Cyclic voltammetry reveals a reversible oxidation of 6- to give the 29-e neutral tripledecker complex μ-L(FeCp) (6), while the oxidation of the higher homologues is fully irreversible.Protonation of 6- - 8- affords hydrido complexes μ-L(FeCp) (12) is produced.Similar stacking reactions with manganese group M(CO)3 fragments produce neutral tripledecked complexes as e.g. μ-L(CoL) (14) (L = C4H4BPh).In the case of the reaction of (1-) (2-) with PF6 symmetric tripledecker compounds μ-L2 (15a,b) and μ-L(FeCp)2 (16a,b) are formed in a novel dismutation reaction (a: L = C4H4BMe; b: L = C4H4BPh). Key words: (Borole)metal complexes; tripledecked complexes, electrophilic stacking reaction of, nucleophilic degradation of
