Crystallography Journals Online : IUCR Backfile Archive 1948-2001
Chemistry and Pharmacology
The title complex, [Co2Cl2(μ-O2)(cyclam)2](C24H20B)2·2Me2CO, was obtained when [Co(cyclam)Cl2](BPh4)2 was crystallized from acetone in air; cyclam is 1,4,8,11-tetraazacyclotetradecane, C10H24N4. The peroxo O–O moiety straddles a crystallographic centre of inversion (the two octahedral Co atoms are symmetrically bridged by the O2 moiety), hence only half of the complex cation is in the asymmetric unit. A comparison of the O—O [1.483 (3) Å], Co—Cl [2.2647 (8) Å] and Co—O [1.894 (2) Å] bond lengths with similar bonds in previously determined structures indicates the oxidation of CoII to CoIII during the crystallization process. In the crystal lattice, cation dimers are encapsulated by six [BPh4]− anions, with C—H...π hydrogen bonds between the cyclam methylene groups and the phenyl rings of the anion.
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