title: The first cobalt metallacrowns: preparation and characterization of mixed-valence cobalt(II/III), inverse 12-metallacrown-4 complexes.
abstract: Aerobic reactions of Co(O(2)CMe)(2).4H(2)O with di-2-pyridyl ketone oxime (Hpko) in the presence of counterions (ClO(4)(-), PF(6-)) give the tetranuclear, mixed-valence cobalt(II/III) clusters [Co(II)(2)Co(III)(2)(OR)(2)(O(2)CMe)(2)(pko)(4)S(2)]X(2) [R = H, S = MeOH, X = ClO(4) (1); R = Me, S = EtOH, X = PF(6) (2)] depending on the solvent mixture. Complexes 1 and 2 are the first Co members in the family of metallacrowns adopting the extremely rare inverse 12-metallacrown-4 motif.
authors.affiliation: Department of Chemistry, University of Patras, Greece.
authors.forename: Theocharis C
authors.initials: TC
authors.lastname: Stamatatos
authors.forename: Stavroula
authors.initials: S
authors.lastname: Dionyssopoulou
authors.forename: Georgios
authors.initials: G
authors.lastname: Efthymiou
authors.forename: Panayotis
authors.initials: P
authors.lastname: Kyritsis
authors.forename: Catherine P
authors.initials: CP
authors.lastname: Raptopoulou
authors.forename: Aris
authors.initials: A
authors.lastname: Terzis
authors.forename: Ramon
authors.initials: R
authors.lastname: Vicente
authors.forename: Albert
authors.initials: A
authors.lastname: Escuer
authors.forename: Spyros P
authors.initials: SP
authors.lastname: Perlepes