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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)(7)CO-B(CF3)(3)]

TitleSalts of the cobalt(I) complexes [Co(CO)(5)](+) and[Co(CO)(2)(NO)(2)](+) and the Lewis acid-base adduct [CO2(CO)(7)CO-B(CF3)(3)]
Publication TypeJournal Article
Year of Publication2006
AuthorsBernhardt, E, Finze, M, Willner, H, Lehmann, CW, Aubke, F
JournalChemistry-a European Journal
Volume12
Pagination8276-8283
Date PublishedNov
Type of ArticleArticle
ISBN Number0947-6539
KeywordsALUMINUM HALIDES, ANIONS, carbonyl ligands, cobalt, density, density functional calculations, DICOBALT OCTACARBONYL, EXCHANGE, LIGANDS, METAL-CARBONYL CATIONS, NITRIC-OXIDE, NITROSYL, SOLID-STATE, SPECTROSCOPIC PROPERTIES, vibrational spectroscopy, VIBRATIONAL-SPECTRA
Abstract

The reaction of [Co-2(CO)(8)] with (CF3)(3)BCO in hexane leads to the Lewis acid-base adduct [CO2(CO)(7)COB(CF3)(3)] in high yield. When the reaction is performed in anhydrous HF solution [Co(CO)(5)][(CF3)(3)BF] 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 [Co-2(CO)(8)] or [Co(CO)(3)NO] 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.

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