Synthesis, structural and electronic characterisation of
trans-[OsCl2(PEt2Ph)3{
(NC)2C![[double bond, length as m-dash]](https://www.rsc.org/images/entities/char_e001.gif)
C(CN)OH}], a complex featuring a
redox-active, tetracyanoethylene-derived
ligand
Abstract
Reaction of
mer-[OsCl
3
(PEt
2
Ph)
3
] with
AgBF
4
and tetracyanoethylene (tcne) in tetrahydrofuran
yielded the unexpected product
trans-[OsCl
2
(PEt
2
Ph)
3
(tcva)],
where tcva is tricyanovinyl alcohol (1,1,2-tricyano-2-hydroxyethylene).
Structural characterisation of
trans-[OsCl
2
(PEt
2
Ph)
3
(tcva)]
was accomplished through IR spectroscopy, fast atom bombardment mass
spectrometry, elemental analysis and single-crystal X-ray diffraction.
The crystallographic study revealed that tcva is σ-bound to the Os
atom via nitrogen and that the OH group occupies the
cis position with respect to the metal-bound nitrogen. The
frontier orbitals of
trans-[OsCl
2
(PEt
2
Ph)
3
(tcva)]
were investigated by electrochemistry and UV/VIS, IR and EPR
spectroelectrochemical studies, which revealed that the complex is best
described as
trans-[Os
II
Cl
2
(PEt
2
Ph)
3
(tcva)
0
].
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![[double bond, length as m-dash]](https://www.rsc.org/images/entities/h2_char_e001.gif)
C(CN)OH}], a complex featuring a
redox-active, tetracyanoethylene-derived
ligand