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Iron ruthenium: syntheses, structures and IR spectroelectrochemical characterisation of half-sandwich Group 8 acetylide complexes
A convenient modification to the established synthetic routes for the preparation of complexes [M(C&z.tbd;CR)(dppe)Cp′] (M = Fe, Ru; Cp′ = η 5 -C 5 H 5 (Cp), η 5 -C 5 Me 5 (Cp*); R = C 6 H 5 , C 6 H 4 - p -OMe, C 6 H 4 - p -NO 2 , t Bu) and [Ru(C&z.tbd;CR)(PPh 3 ) 2 Cp] from the correspondin...
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Published in: | New journal of chemistry 2021-08, Vol.45 (33), p.14932-14943 |
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Main Authors: | , , , , , , |
Format: | Article |
Language: | |
Online Access: | Get full text |
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Summary: | A convenient modification to the established synthetic routes for the preparation of complexes [M(C&z.tbd;CR)(dppe)Cp′] (M = Fe, Ru; Cp′ = η
5
-C
5
H
5
(Cp), η
5
-C
5
Me
5
(Cp*); R = C
6
H
5
, C
6
H
4
-
p
-OMe, C
6
H
4
-
p
-NO
2
,
t
Bu) and [Ru(C&z.tbd;CR)(PPh
3
)
2
Cp] from the corresponding [MCl(PP)Cp′] complex and the alkyne HC&z.tbd;CR
via
an intermediate vinylidene is described. The complexes are generally obtained as high quality crystalline samples directly from the reaction mixture. In agreement with previous studies, the iron complexes undergo a predominantly metal-centred oxidation, whilst there is greater involvement of the acetylide ligand in the oxidation processes associated with the ruthenium analogues. Analysis of the redox properties and spectroelectrochemical investigations reveal limited differences in the gross electronic structures of the Cp
vs.
Cp* derivatives in each of the Fe and Ru series.
A synthetic 'trick' affording complexes [M(C&z.tbd;CR)(dppe)Cp′] (M = Fe, Ru) in high purity directly from the reaction vessel is described. |
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ISSN: | 1144-0546 1369-9261 |
DOI: | 10.1039/d0nj03093g |