The reaction of the PPN+ salt of
[Fe4C(CO)12]2-
with ClHgM (M = metal fragment) in
CH2Cl2 gives the
new hexanuclear carbide clusters
(PPN)[Fe4C(CO)12{μ-HgM}] (M = Mo(CO)3Cp (1),
W(CO)3Cp (2),
Mn(CO)5
(3), Fe(CO)2Cp (4),
Co(CO)4 (5)) in good yields.
The
X-ray crystal structure of 1 is without precedent in
that
a mercury atom bridges one of the two edges defined by
wingtip and hinge iron atoms of the Fe4C
butterfly,
giving a new skeletal isomer of an MFe4C
arrangement.
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