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Upstream product

• 36608-07-8 dimolybdenum(II) tetrakis(trifluoroacetate) 
• 1486-28-8 diphenyl(methyl)phosphine 

Relevant academic research and scientific papers

Crystal structure of the axial (orange-yellow) isomer of bis(methyldiphenylphosphine)tetrakis(trifluoroacetato)dimolybdenum

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°.

Coordination complexes of tetrakis(trifluoroacetato)dimolybdenum. A solution 1H, 19F, and 31P nuclear magnetic resonance and infrared spectroscopic study

New coordination complexes of the type Mo2(O2CCF3)4(L)2 where L is Me3P, Me2PhP, MePh2P, Ph3P, Et3P, (c-Hx)3P (c-Hx = cyclohexyl), (t-Bu)3P, (Me3Si)3P, Me3PO, and quinuclidine have been prepared. These complexes fall into two classes, viz., class I or class II. Class I complexes are formed with MePh2P, Ph3P, (c-Hx)3P, (t-Bu)3P, (Me3Si)3P, Me3PO, and quinuclidine. Solution infrared and 19F NMR studies show that these complexes are of the classical type (axial coordination) as shown by X-ray crystallography for L = pyridine, some years ago. Solution 31P{1H} NMR spectroscopy of these phosphine adducts indicates that they are extensively dissociated in CDCl3. Class II complexes (L = Me3P, Me2PhP, or Et3P) exist in solution (CDCl3) with bidentate and monodentate trifluoroacetate groups as determined by infrared and 19F NMR spectroscopy. At least two isomers are present as shown by 31P{1H} and 1H{31P} NMR spectroscopy. Some bidentate phosphine complexes are also described.