76036-78-7Relevant academic research and scientific papers
Reactions of phosphines with tetrakis(trifluoroacetato)dimolybdenum(II)
Cotton, F. Albert,Lay, Dennis G.
, p. 935 - 940 (1981)
Reactions of Mo2(O2CCF3)4 with several phosphines have been examined, and X-ray crystal structures of the products have been determined. Mo2(O2CCF3)4(PPh3) 2 (1) made by the method of Girolami, Mainz, and Andersen (GMA) was found to have the axial diadduct structure assigned to it by GMA, but for technical crystallographic reasons the structure was not fully refined. Crystallographic data for 1 are as follows: space group, P1; a = 9.083 (2), b = 19.897 (6), c = 18.838 (3) ?; α = 134.62 (3), β = 98.34 (2), γ = 94.12 (2)°; V = 2323 (3) ?3; Z = 2. Mo2(O2CCF3)4(PPhEt2) 2 (2) was prepared by reaction in ether and shown by X-ray work to contain nonaxial phosphines which have displaced one oxygen atom of each of two CF3CO2 ligands from the molybdenum atoms, to give an Mo2(OO)2P2O2 core with C2h symmetry. The Mo-Mo bond length is 2.100 (1) ?. The crystallographic data for 2 are as follows: space group, P1; a = 8.785 (1), b = 11.184(2), c = 11.283 (5) ?; α = 120.89 (2), β = 103.11 (2), γ = 91.50 (1)°; V = 912 (1) ?3; Z = 1. When the reaction of Mo2(O2CCF3)4 with PPh2Me was carried out in ether, the only crystalline product isolated was Mo2(O2CCF3)4(Et2O) 2 with the Et2O molecules axially coordinated. Reaction of Mo2(O2CCF3)4 with PPh2Me in toluene gave the crystalline product Mo2(O2CCF3)4(PPh2Me) 2 (3), which has the same type structure as 2 and an Mo-Mo distance of 2.107 (2) ?. Crystal data for this compound are as follows: space group, C2/c; a = 25.898 (4), b = 11.102 (1), c = 17.800 (3) ?; β = 128.55 (1)°; V = 4002 (4) ?3; Z = 4.
