Abstract
The apparent Sc
3+
adduct of [Fe
IV
(O)-(TMC)]
2+
(
1
, TMC = 1,4,8,11-tetramethyl-1,4,8,11-tetraazacyclotetradecane) has been synthesized in amounts sufficient to allow its characterization by various spectroscopic techniques. Contrary to the earlier assignment of a +4 oxidation state for the iron center of
1
, we establish that
1
has a high-spin iron(III) center based on its Mössbauer and EPR spectra and its quantitative reduction by 1 equiv of ferrocene to [Fe
II
(TMC)]
2+
. Thus,
1
is best described as a Sc
III
–O–Fe
III
complex, in agreement with previous DFT calculations (Swart, M.
Chem. Commun.
2013
,
49
, 6650.). These results shed light on the interaction of Lewis acids with high-valent metal-oxo species.
