The synthesis and reaction chemistry of heterobimetallic FcPPh
2AuCl (
1) and FcPPh
2Au-C
![](http://pubs.acs.org/images/entities/tbd1.gif)
CR compounds (
3a, R = bipy;
3b, R = C
6H
4-4-C
![](http://pubs.acs.org/images/entities/tbd1.gif)
N;
3c, R = C
5H
4N-4;
3d, R = NCN-H;
3e, R = NCN-I; Fc = (η
5-C
5H
5)(η
5-C
5H
4)Fe; bipy = 2,2′-bipyridyl-5-yl; NCN = [C
6H
2(CH
2NMe
2)
2-2,6]
−) toward diverse organometallic molecules is described. In context with this background,
1 was prepared by reacting FcPPh
2 with (tht)AuCl (tht =
tetra
hydro
thiophene). The reaction of
1 either with HC
![](http://pubs.acs.org/images/entities/tbd1.gif)
CR (
2a, R = bipy;
2b, R = C
6H
4-4-C
![](http://pubs.acs.org/images/entities/tbd1.gif)
N;
2c, R = C
5H
4N-4) or with the lithium acetylides LiC
![](http://pubs.acs.org/images/entities/tbd1.gif)
CR (
2d, R = NCN-H;
2e, R = NCN-I) gave complexes
3a−
3e in good yield. In
1 the gold(I) chloride entity was further reacted with the organometallic alkyne HC
![](http://pubs.acs.org/images/entities/tbd1.gif)
CML
n (
4a, ML
n = (η
6-C
6H
5)Cr(CO)
3;
4b, ML
n = Fc;
4c, ML
n = Rc; Rc = (η
5-C
5H
5)(η
5-C
5H
4)Ru) to afford the heterotrimetallic complexes FcPPh
2Au-C
![](http://pubs.acs.org/images/entities/tbd1.gif)
CML
n (
5a, ML
n = (η
6-C
6H
5)Cr(CO)
3;
5b, ML
n = Fc;
5c, ML
n = Rc) in which three different transition metal atoms are connected via rigid-rod structured carbon-rich units. Complexes
3a−
3e feature with their terminal nitrogen donor groups a further binding site, which allows the introduction of a third metal-containing fragment. In this context, the reaction of
3b with [Ru]N
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N[Ru] (
6) ([Ru] = [η
3-
mer-{2,6-(Me
2NCH
2)
2C
5H
3N}RuCl
2]) resulted in the formation of neutral heterotrimetallic FcPPh
2Au-C
![](http://pubs.acs.org/images/entities/tbd1.gif)
C-C
6H
4-4-C
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N-[Ru] (
7). The synthesis of an even heterotetrametallic complex [FcPPh
2Au-C
![](http://pubs.acs.org/images/entities/tbd1.gif)
C-C
5H
4N-Cu{(Me
3SiC
![](http://pubs.acs.org/images/entities/tbd1.gif)
C)
2[Ti]}]OTf (
9) could be achieved by treatment of
3c with the organometallic π-tweezer {[Ti](μ-σ,π-C
![](http://pubs.acs.org/images/entities/tbd1.gif)
CSiMe
3)
2}CuOTf (
8a). Heterobimetallic
3a afforded in a straightforward reaction with equimolar amounts of (nbd)Mo(CO)
4 (
14) (nbd = 1,5-
nor
borna
diene) and {[Ti](μ-σ,π-C
![](http://pubs.acs.org/images/entities/tbd1.gif)
CSiMe
3)
2}MX (
8b, M = Cu(N
![](http://pubs.acs.org/images/entities/tbd1.gif)
CMe), X = PF
6;
8c, M = Ag, X = OClO
3), respectively, compounds FcPPh
2Au-C
![](http://pubs.acs.org/images/entities/tbd1.gif)
C-bipy[Mo(CO)
4] (
15) and (FcPPh
2Au-C
![](http://pubs.acs.org/images/entities/tbd1.gif)
C-bipy[{[Ti](μ-σ,π-C
![](http://pubs.acs.org/images/entities/tbd1.gif)
CSiMe
3)
2}M])X (
16a, M = Cu, X = PF
6;
16b, M = Ag, X = ClO
4). The synthesis of the Fe-Au-Pt NCN pincer molecule FcPPh
2Au-C
![](http://pubs.acs.org/images/entities/tbd1.gif)
C-NCN-Pt-C
![](http://pubs.acs.org/images/entities/tbd1.gif)
CR (
13a, R = bipy;
13b, R = C
6H
4-4-C
![](http://pubs.acs.org/images/entities/tbd1.gif)
N) was possible by the consecutive reaction of Me
3SiC
![](http://pubs.acs.org/images/entities/tbd1.gif)
C-NCN-PtCl (
10) with
Li-2a or
Li-2b to give Me
3SiC
![](http://pubs.acs.org/images/entities/tbd1.gif)
C-NCN-Pt-C
![](http://pubs.acs.org/images/entities/tbd1.gif)
CR (
11a, R = bipy;
11b, R = C
6H
4-4-C
![](http://pubs.acs.org/images/entities/tbd1.gif)
N), which with [
n-Bu
4N]F produced HC
![](http://pubs.acs.org/images/entities/tbd1.gif)
C-NCN-Pt-C
![](http://pubs.acs.org/images/entities/tbd1.gif)
CR (
12a, R = bipy;
12b, R = C
6H
4-4-C
![](http://pubs.acs.org/images/entities/tbd1.gif)
N). On reacting
12a and
12b with
1, complexes
13a and
13b were formed, which are highly insoluble, and hence, no further reactions were carried out. The solid state structures of
3a,
3b,
3e,
5b,
5c, and
16a are reported. Most characteristic for these complexes is that the appropriate transition metals are linked by carbon-rich organic bridging units. The electrochemical properties of selected samples (
3a−
3c,
5a−
5c,
7,
9,
16a, and
16b) are reported. The cyclovoltammetric data show that there is no significant influence of the organic and organometallic acetylide units on the redox potential of the diphenylphosphino ferrocene in
3a−
3c and
5a−
5c. Remarkable is that the chelate coordination of the bipyridyl unit to Cu(I) in
16a results in a reduction of Cu(I) followed by reoxidation of Cu(0) without any structural change of the molecule involved, which is unique in titanium(IV)−copper(I) chemistry.