Abstract
From high field and frequency electron paramagnetic resonance (EPR) powder spectra of the high spin chromium(II) complex trans-[Cr(NCCH 3) 4(FBF 3) 2] ( 1) recorded at T = 5–40 K the EPR parameters were found to be D = −2.19 cm −1, E ≈ 0 cm −1, and g ‖ = g ⊥ = 1.9833. The reaction between a MeCN solution of 1 and dioxygen gave dark green crystals of [(CH 3CN) 5CrOCr(NCCH 3) 5](BF 4) 4·2CH 3CN ( 2). From the X-ray crystal structure of 2 at T = 122 K a Cr–O–Cr angle of 180° and a Cr–O distance of 1.7556(5) Å was found. This is the shortest among the known Cr–O distances in dinuclear complexes containing a CrOCr 4+ core, and this can partly explain the strong antiferromagnetic coupling between the two chromium(III) centers in 2.
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