The reaction of 1,4-diethynylbenzene with
cis-RuCl2(dppe)2 and iodoferrocene
gave the
homobimetallic systems
Cl(dppe)2RuC⋮CC6H4C⋮CRu(dppe)2Cl
(2) and
(η5-C5H5)Fe(η5-C5H4)C⋮CC6H4C⋮C(η5-C5H4)Fe(η5-C5H5)
(3), respectively. The organometallic
terminal
alkynes
Cl(dppe)2RuC⋮CC6H4C⋮CH
(6) and
(η5-C5H5)Fe(η5-C5H4C⋮CC6H4C⋮CH)
(8),
obtained by desilylation of the corresponding complexes
Cl(dppe)2RuC⋮CC6H4C⋮CSiiPr3
(5) and
(η5-C5H5)Fe(η5-C5H4C⋮CC6H4C⋮CSiiPr3)
(7), were used as key starting products
for access to the heterotrimetallic systems
trans-(PnBu3)2Pd[−C⋮CC6H4C⋮CRu(dppe)2Cl]2 (10; 53%) and
trans-(PnBu3)2Pd[(−C⋮CC6H4C⋮CC5H4-η5)Fe(η5-C5H5)]2
(11; 73%) by
reaction with PdCl2(PBu3)2.
The cyclic voltammetry studies of the complexes 2 and
3 have
shown that the electrochemical response was strongly dependent on the
connection type
between the two terminal organometallic fragments and the organic
bridge and that the
insertion of the palladium moiety
trans-Pd(PBu3)2 in the trimetallic
complexes 10 and 11
induced totally different electrochemical behavior.
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