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From an Easily Accessible Pentacarbonylcobalt(I) Salt to Piano‐Stool Cations [(arene)Co(CO) 2 ] +
Author(s) -
Meier Stefan C.,
Holz Albina,
Schmidt Alexei,
Kratzert Daniel,
Himmel Daniel,
Krossing Ingo
Publication year - 2017
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201703589
Subject(s) - superacid , thermochemistry , cobalt , chemistry , salt (chemistry) , protonation , solvent , computational chemistry , medicinal chemistry , inorganic chemistry , organic chemistry , catalysis , ion
The facile synthesis of a pentacarbonyl cobalt(I) salt without the need for a superacid as solvent is presented. This salt, [Co(CO) 5 ] + [Al(OR F ) 4 ] − {R F =C(CF 3 ) 3 }, readily accessible on a multigram scale, undergoes substitution reactions with arenes yielding the hitherto unknown class of two‐legged cobalt piano‐stool complexes [(arene)Co(CO) 2 ] + with four different arene ligands. Such a substitution chemistry would have been impossible in superacid solution, as the arenes used would have been oxidized and/or protonated. Thus, the general approach described herein may have a wide synthetic use. Additionally, the thermochemistry of the piano‐stool complexes is shown to be not easy to describe computationally and most of the established DFT methods overestimate the reaction energies. Only CCSD(T) calculations close to the basis set limit gave energies fully agreeing with the experiment.