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Synthesis and Oxidative Stability of an Anionic Perfluoroethyl Cobalt(III) Complex
Author(s) -
Shreiber Scott T.,
Vicic David A.
Publication year - 2020
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.202000149
Subject(s) - chemistry , cobalt , ligand (biochemistry) , yield (engineering) , adduct , cyclic voltammetry , medicinal chemistry , tris , salt (chemistry) , potassium , boron , coordination complex , inorganic chemistry , electrochemistry , organic chemistry , metal , materials science , receptor , electrode , metallurgy , biochemistry
Upon reaction of the versatile tris(perfluoroethyl) cobalt(III) precursor [ fac ‐(MeCN) 3 Co(C 2 F 5 ) 3 ] with potassium tris(pyrazolyl)borate (KTp) in the presence of a tetraphenylphosphonium salt, κ 2 ‐ and κ 3 ‐ adducts of the scorpionate ligand with cobalt were observed. Heating this mixture to 50 °C induced complete κ 3 ‐coordination of the Tp ligand to cobalt to afford the anionic complex [PPh 4 ][( κ 3 ‐Tp)Co(C 2 F 5 ) 3 ] in 81 % yield. This new fluoroalkyl cobalt complex was characterized by NMR and UV‐Vis spectroscopies, X‐ray crystallography, and cyclic voltammetry. The oxidation of [PPh 4 ][( κ 3 ‐Tp)Co(C 2 F 5 ) 3 ] occurs at much less‐positive potentials relative to the related [(MeCN) 3 Co(C 2 F 5 ) 3 ] and [(tpy)Co(C 2 F 5 ) 3 ] derivatives.