Synthesis, characterisation, and magnetic properties of a permethylindenyl manganocene†
Alexander
Evans, 
a
Samantha C.
Binding,
a
William K.
Myers,
b
Agamemnon E.
Crumpton,
a
Zoë R.
Turner,
a
Jean-Charles
Buffet
a
and
Dermot
O'Hare
*a
a
Samantha C.
Binding,
a
William K.
Myers,
b
Agamemnon E.
Crumpton,
a
Zoë R.
Turner,
a
Jean-Charles
Buffet
a
and
Dermot
O'Hare
*a
Abstract
The heptamethylindenyl ligand (C9Me7−; Ind*) has been used to synthesise the manganese complex, (η5-Ind*)2Mn, by lithiation of the proligand and subsequent salt metathesis with MnCl2. The solid state molecular structure indicates a low-spin (S = ½) ground state for the Mn2+ metal centre at 100 K. Solution EPR spectroscopy, solid state magnetic susceptibility measurements, and computational studies suggest the complex undergoes a thermally accessible spin-crossover to a high-spin (S = 5/2) state.
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