Molybdenum, Tungsten, and Rhenium d² Complexes That Contain the [(C₆F₅NCH₂CH₂)₂NMe]^2- Ligand

Abstract

The reaction between (C6F5NHCH2CH2)2NH and methyl iodide in the presence of base leads to (C6F5NHCH2CH2)2NMe (H2[ArFNMe]) in good yield. Reactions between H2[ArFNMe] and MCl4 (M = Mo or W) in the presence of NEt3 yield pseudooctahedral paramagnetic compounds of the type [Et3NH]{[ArFNMe]MCl3}. The reaction between 3 equiv of MeMgCl and [Et3NH]{[ArFNMe]MoCl3} produced paramagnetic trigonal bipyramidal [ArFNMe]MoMe2. The reaction between H2[ArFNMe] and Mo(NMe2)4 produced paramagnetic seven-coordinate [(C6F4(NMe2)NCH2CH2)2NMe]MoF2 instead of five-coordinate [(C6F5NCH2CH2)2NMe]Mo(NMe2)2, while the reaction between H2[ArFNMe], [NEt4]2[Re(O)Cl5], and NEt3 produced diamagnetic trigonal bipyramidal [ArFNMe]Re(O)Cl. X-ray studies confirmed the structures of [Et3NH]{[ArFNMe]MoCl3}, [ArFNMe]MoMe2, [(C6F4(NMe2)NCH2CH2)2NMe]MoF2, and [ArFNMe]Re(O)Cl.