Stable salts of the hexacarbonyl chromium(I) cation and its pentacarbonyl-nitrosyl chromium(I) analogue

Jan Bohnenberger, Wolfram Feuerstein, Daniel Himmel, Michael Daub, Frank Breher () and Ingo Krossing ()
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Jan Bohnenberger: Universität Freiburg
Wolfram Feuerstein: Institute of Inorganic Chemistry
Daniel Himmel: Universität Freiburg
Michael Daub: Universität Freiburg
Frank Breher: Institute of Inorganic Chemistry
Ingo Krossing: Universität Freiburg

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: Abstract Homoleptic carbonyl radical cations are a textbook family of complexes hitherto unknown in the condensed phase, leaving their properties and applications fundamentally unexplored. Here we report on two stable 17-electron [Cr(CO)6]•+ salts that were synthesized by oxidation of Cr(CO)6 with [NO]+[Al(ORF)4]− (RF = C(CF3)3)) in CH2Cl2 and with removal of NO gas. Longer reaction times led to NO/CO ligand exchange and formation of the thermodynamically more stable 18-electron species [Cr(CO)5(NO)]+, which belongs to the family of heteroleptic chromium carbonyl/nitrosyl cations. All salts were fully characterized (IR, Raman, EPR, NMR, scXRD, pXRD, magnetics) and are stable at room temperature under inert conditions over months. The facile synthesis of these species enables the thorough investigation of their properties and applications to a broad scientific community.

Date: 2019
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DOI: 10.1038/s41467-019-08517-2

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