Crystal structure of hexafluoro-2,4-pentanedionato complexes of cobalt(III). [Co(hfac)(en) 2](ClO 4) 2 and β-[Co(hfac)(trien)](ClO 4) 2

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The crystal structures of [Co(hfac)(en) 2](ClO 4) 2 ( I) and β-[Co(hfac) (trien)](ClO 4) 2 ( II) have been determined by X-ray diffraction at ambient temperature, where Hfac = hexafluoro-2,4-pentanedione, en = ethylenediamine and trien = 1,8-diamino-3,6-diazaoctane. The relative configuration of the cation in II is rel-Δ- RR. Their molecular structures are compared with those previously reported for [Co(hfacOH)(en) 2] +, [Co(hfacOH 3)(en) 2] + and β-[Co(hfacOCH 3)(trien)] +, in which an OH − or OCH 3 − anion is covalently combined with one of the carbonyl carbon atoms on the hfac ligand. The quasiaromaticity of the coordinating hfac ligand in I and II was structurally characterized.