A ruthenium(II) allenylidene complex with a 4,5-diazafluorene functional group: A new building-block for organometallic molecular assemblies

Abstract

The synthesis of the new ruthenium(II) allenylidene complex [ClRu(dppe) 2 C C C 11H 6N 2][OTf] ( 4) (dppe = 1,2-bis(diphenylphosphino)ethane) terminated with a 4,5-diazafluorene ligand is reported. Further coordination of that metal allenylidene to ruthenium and rhenium moieties leads to the bimetallic adducts [ClRu(dppe) 2 C C C 11H 6N 2{Ru(bpy) 2}][B(C 6F 5) 4] 3 ( 5a), [ClRu(dppe) 2 C C C 11H 6N 2{Ru( t Bu-bpy) 2}][PF 6] 3 ( 5b) and [ClRu(dppe) 2 C C C 11H 6N 2{Re(CO) 3Cl}][OTf] ( 6). Their optical and electrochemical properties show that the allenylidene moiety is an attractive molecular clip for the access to larger original redox-active homo/heteronuclear multi-component supramolecular assemblies. The X-ray crystal structure of the allenylidene metal building block is also described.