76036-79-8Relevant academic research and scientific papers
Crystal structure of the axial (orange-yellow) isomer of bis(methyldiphenylphosphine)tetrakis(trifluoroacetato)dimolybdenum
Girolami, Gregory S.,Andersen, Richard A.
, p. 1318 - 1321 (1982)
The X-ray crystal structure of the orange-yellow isomer of Mo2(O2CCF3)4(PMePh2) 2 confirms that it possesses a class I (axial) structure as previously deduced spectroscopically. Accordingly, PMePh2 is capable of forming both class I and class II (equatorial) adducts with Mo2(O2CCF3)4. NMR studies show that an equilibrium between the two isomers is established in solution. Crystal data: space group P21/c; a = 9.923 (1) ?, b = 22.517 (2) ?, c = 18.735 (3) ?, β = 99.18 (1)°; V= 4132 (2) ?3; Z = 4; R = 4.43%, Rw = 6.63%; Mo-Mo = 2.128 (1)?, Mo-P = 2.988 = 0.024 ?, Mo-Mo-P = 166.15 = 0.16°.
Reactions of phosphines with tetrakis(trifluoroacetato)dimolybdenum(II)
Cotton, F. Albert,Lay, Dennis G.
, p. 935 - 940 (2008/10/08)
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.
