Bimetallic systems. Part 22. Molybdenum(0)– and manganese(I)-iron(0) carbonyl complexes containing one bridging Ph2PCH2PPh2ligand, including the reversible uptake of carbon monoxide: crystal structure of [(OC)4Fe(µ-Ph2PCH2PPh2)Mo(CO)4]·0.5 C6H5Cl
- 1 January 1987
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 6,p. 1509-1513
- https://doi.org/10.1039/dt9870001509
Abstract
Treatment of [Fe2(CO)9] with dppm (Ph2PCH2PPh2) in tetrahydrofuran gave [Fe(CO)4(dppm-P)] and other products. Treatment of [Fe(CO)4(dppm-P)] with [Mn(CO)5Br] gave [(OC)4Fe(µ-dppm)-Mn(CO)3Br] in 58% yield. This bimetallic complex reacted reversibly with carbon monoxide, breaking the metal–metal bond to give [(OC)4Fe(µ-dppm)Mn(CO)4Br]. Treatment of [Fe(CO)4(dppm-P)] with [Mo(CO)4(nbd)]{nbd = norbornadiene (bicyclo[2.2.1]hepta-2,5-diene)} gave [(OC)4Fe(µ-dppm)Mo(CO)4] in 47% yield. This bimetallic complex reacts with carbon monoxide to give a complex, formulated as [(OC)4Fe(µ-dppm)Mo(CO)5], which was not isolated. Analogous reactions with the diphosphine CH2 C(PPh2)2 are described. Crystals of [(OC)4Fe(µ-dppm)-Mo(CO)4] are tetragonal, space group I41cd(no. 110), with a= 1 853.1(4), c= 4 106.8(9) pm, and Z= 16; final R= 0.0633 for 3 357 observed reflections. The structure shows that there is a metal–metal bond [Fe–Mo 302.4(5) pm] formulated as a donor → acceptor bond, viz. Fe → Mo.Keywords
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