Molecular and electronic structure of a mixed-valent class II, dinuclear complex containing a linear [FeII–O–FeIII]3+ core
Abstract
One-electron reduction of
[{LFe
III
(Ph
2
acac)}
2
(µ-O)]
[BPh
4
]
2
1[BPh
4
]
2
(L =
1,4,7-trimethyl-1,4,7-triazacyclononane,
Ph
2
acac
-
= 1,3-diphenylpropane-1,3-dionate) in
CH
2
Cl
2
–toluene by 1 equiv. of cobaltocene
produces the mixed-valent complex
[{LFe(Ph
2
acac)}
2
(µ-O)][BPh
4
]·C
6
H
5
Me 2[BPh
4
]·
C
6
H
5
Me which is characterized by X-ray
crystallography; 2 has an S = ½ ground state
(antiferromagnetically coupled high-spin Fe
III
and high-spin
Fe
II
with J = -65 cm
-1
) and
exhibits class II behaviour according to the Robin and Day
classification.
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