The Fe(TPA) (TPA = tris(pyridyl-2-methyl)amine) class of non-haem Fe catalysts is proposed to carry out selective hydrocarbon oxidations through the generation of high-valent iron species. Using ambient mass spectrometry, we obtain direct evidence for the formation of an FeV(O)(OH) species under catalytic conditions. In addition, 18O-labelling suggests that this FeV(O)(OH) species serves as the active oxidant in hydrocarbon oxidation catalysis.
Bibliographical noteFunding Information:
The University of Illinois at Urbana-Champaign (UIUC) provided financial support for the experiments described in this article, which were carried out at UIUC in collaboration with colleagues at the University of Minnesota. The work at the University of Minnesota (UMN) was supported by the US Department of Energy, Office of Basic Energy Sciences (Grant DE-FG02-03ER15455 to L. Q.). We also acknowledge the staff of the mass spectrometry facility in the UMN Masonic Cancer Center for access to instrumentation.