Homo- and heterometallic transition-metal complexes containing bis(cyclopentadienyl)methane as ligand

✍ Scribed by Helmut Werner

• Book ID: 104138800
• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 667 KB
• Volume: 198-200
• Category: Article
• ISSN: 0020-1693
• DOI: 10.1016/s0020-1693(00)92416-2

✦ Synopsis

Following earlier work in our laboratory on mononuclear nucleophilic half-sandwich type compounds with Co, Rh and Ir as metal centers, a series of mono-and dinuclear complexes containing bis(cyclopentadienyl)methane as ligand has been prepared. It is shown that the criterion of metal basicity can be extended to corresponding dinuclear species and that not only homometallic but also heterometallic compounds are accessible. The key to success for the preparation of unsymmetrical dinuclear complexes of the general type [CH,(~H&][MLJ[ML',] and [CH,(C,H,),][MI+,][M'L',] is the intermediary formation of the mononuclear compounds [~H,CH2C,HJh41_,,] which on treatment with RLi and a second metallic precursor give the final products. Additional coupling of the two metal centers in the dinuclear complexes can be achieved either by diphosphines (P2Me,, dmpe), by one CO or by two bridging vinyl ligands. The problem of metal cooperativity in the dimetallic compounds is briefly discussed.