Structure of tetracarbonyl[tris(trimethylsilyl)phosphine]iron(0)

The Parent Diarsene HAs=AsH as Side‐on Bound Ligand in an Iron Carbonyl Complex

“…[10] In contrast, for [{Fe(CO) 4 }P(SiMe 3 ) 3 ], four CO bands were reported and, therefore,a ne quatorially coordinating ligand was proposed, [11] although, in the solid state structure,t he P(SiMe 3 ) 3 ligand takes the axial position. [12] Them olecular structure of 1 (Figure 1) shows at rigonal bipyramidally coordinated iron center with the As(SiMe 3 ) 3 ligand in axial position as also found for the corresponding Sb compound [{Fe(CO) 4 }Sb(SiMe 3 ) 3 ]. [13] Themethanolysis of 1 in diethylether at low temperatures results in the formation of yellow crystals of 2 in av ery low yield, which are surrounded by alarge amount of unidentified brown solid (Scheme 2).…”

“…Similarly, [{Fe(CO) 4 }Sb(SiMe 3 ) 3 ] shows three CO stretching modes in the IR spectrum . In contrast, for [{Fe(CO) 4 }P(SiMe 3 ) 3 ], four CO bands were reported and, therefore, an equatorially coordinating ligand was proposed, although, in the solid state structure, the P(SiMe 3 ) 3 ligand takes the axial position . The molecular structure of 1 (Figure ) shows a trigonal bipyramidally coordinated iron center with the As(SiMe 3 ) 3 ligand in axial position as also found for the corresponding Sb compound [{Fe(CO) 4 }Sb(SiMe 3 ) 3 ]…”

Group 6 metal carbonyl complexes of a family of bulky phosphines: spectroscopic and structural studies of chromium(0)-, molybdenum(0)- and tungsten(0)-pentacarbonylsilylphosphines

“…The long MÀ ÀP bond distances are most likely because of the steric repulsion from the SiMe 3 groups preventing a close approach of the ligand to the metal center. Previous to our report, the only transition metal carbonyl complex containing P(TMS) 3 was Fe{P(TMS) 3 }(CO) 4 [11]. To expand our understanding of the steric and electronic metal-coordinating properties of the silylphosphine ligands, we sought to synthesize the Group 6 metal coordination compounds of PhP(TMS) 2 and HP(TMS) 2 .…”