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Salts of the Cobalt(I) Complexes [Co(CO)5]+ and [Co(CO)2(NO)2]+ and the Lewis Acid–Base Adduct [Co2(CO)7CO-B(CF3)3]

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Lehmann,  Christian W.
Service Department Lehmann (EMR), Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Citation

Bernhardt, E., Finze, M., Willner, H., Lehmann, C. W., & Aubke, F. (2006). Salts of the Cobalt(I) Complexes [Co(CO)5]+ and [Co(CO)2(NO)2]+ and the Lewis Acid–Base Adduct [Co2(CO)7CO-B(CF3)3]. Chemistry – A European Journal, 12(32), 8276-8283. doi:10.1002/chem.200600210.


Cite as: https://hdl.handle.net/11858/00-001M-0000-000F-92E3-A
Abstract
The reaction of [Co2(CO)8] with (CF3)3BCO in hexane leads to the Lewis acid–base adduct [Co2(CO)7CO-B(CF3)3] in high yield. When the reaction is performed in anhydrous HF solution [Co(CO)5][(CF3)3BF] is isolated. The product contains the first example of a homoleptic metal pentacarbonyl cation with 18 valence electrons and a trigonal‐bipyramidal structure. Treatment of [Co2(CO)8] or [Co(CO)3NO] with NO+ salts of weakly coordinating anions results in mixed crystals containing the [Co(CO)5]+/[Co(CO)2(NO)2]+ ions or pure novel [Co(CO)2(NO)2]+ salts, respectively. This is a promising route to other new metal carbonyl nitrosyl cations or even homoleptic metal nitrosyl cations. All compounds were characterized by vibrational spectroscopy and by single‐crystal X‐ray diffraction.