Heteroheptanuclear ReM
6 (M = Cu
2, Ag
3) complexes of 5,5-diethynyl-2,2'-bipyridine were prepared by thereaction of [M
2(
![](/images/entities/mgr.gif)
-dppm)
2(MeCN)
2]
2+ (dppm = bis(diphenylphosphino)methane) with the precursor compound Re(Me
3SiC
![](/images/entities/tbd1.gif)
CbpyC
![](/images/entities/tbd1.gif)
CSiMe
3)(CO)
3Cl in the presence of potassium fluoride by fluoride-catalyzed desilylation. When[Cu
2(
![](/images/entities/mgr.gif)
-dppm)
2(MeCN)
2]
2+ reacts directly with Me
3SiC
![](/images/entities/tbd1.gif)
CbpyC
![](/images/entities/tbd1.gif)
CSiMe
3, a binuclear Cu
I complex [Cu
2(
![](/images/entities/mgr.gif)
-dppm)
2(SiMe
3C
![](/images/entities/tbd1.gif)
CbpyC
![](/images/entities/tbd1.gif)
CSiMe
3)
2]
2+ (
4) was isolated. Further
addition of [Cu
2(
![](/images/entities/mgr.gif)
-dppm)
2(MeCN)
2]
2+ into a THF-MeOH(3:1, v/v) solution of
4 in the presence of potassium fluoride induced isolation of a tetradecanuclear Cu
I14 complex[Cu
14(
![](/images/entities/mgr.gif)
-dppm)
14(C
![](/images/entities/tbd1.gif)
CbpyC
![](/images/entities/tbd1.gif)
C)
2]
10+, which is composed of a binuclear Cu
2(
![](/images/entities/mgr.gif)
-dppm)
2 and four triangular trinuclearCu
3 units. Both heteroheptanuclear Re
IM
I6 and tetradecanuclear Cu
I14 complexes display luminescence in bothsolid states and dichloromethane solutions at room temperature with emissive lifetimes in the range of microseconds.The dual emissive feature for the ReM
6 and Cu
I14 complexes is ascribed tentatively to originate from both MLCT[d(Re/Cu)
![](/images/gifchars/pi.gif)
* (bpy)] and LMCT (acetylide
![](/images/entities/rarr.gif)
M
3) transitions.