Substituted carbonyl derivatives of the Group VI transition metals. V. Complexes with tolyl-substituted Bis(diphenylarsino)methane ligands

1974 ◽  
Vol 27 (2) ◽  
pp. 401 ◽  
Author(s):  
JA Bowden ◽  
R Colton ◽  
Z Sztajer
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Infrared Spectroscopy ◽  
Magnetic Resonance ◽  
Transition Metals ◽  
Steric Effects ◽  
Group Vi ◽  
Carbonyl Derivatives ◽  
Derivatives Of ◽  
Nuclear Magnetic

Ligands of the type bis(ditoly1arsino)methane have been synthesized and their derivatives with hexacarbonylmolybdenum(0) prepared. Nuclear magnetic resonance and infrared spectroscopy have been used to determine the stereochemistry of the complexes and also to study steric effects within the molecules.

Carbonyl halides of the Group VI transition metals. XXVII. Carbon-13 N.M.R. studies on molybdenum compounds

1982 ◽  
Vol 35 (5) ◽  
pp. 895 ◽  
Author(s):  
R Colton ◽  
J Kevekordes
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Transition Metals ◽  
Carbonyl Group ◽  
High Frequency ◽  
Circumstantial Evidence ◽  
Large Shift ◽  
Group Vi ◽  
Magnetic Resonance Studies ◽  
Nuclear Magnetic

Carbon-13 nuclear magnetic resonance studies have been carried out on a number of molybdenum(II) carbonyl halide species. It has been found that for these seven-coordinate capped octahedral complexes there is a very large shift to high frequency for a carbonyl group in the capping position. Thus carbon-13 n.m.r. provides a useful tool to distinguish between possible isomers. Trends in stability and isomer formation previously suspected from circumstantial evidence can now be rationalized.

Carbonyl halides of the Group VI transition metals. XIX. Iodocarbonyl complexes of molybdenum and tungsten with Bis(diphenylarsino)methane

1970 ◽  
Vol 23 (3) ◽  
pp. 441 ◽  
Author(s):  
R Colton ◽  
CJ Rix
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Carbon Monoxide ◽  
Magnetic Resonance ◽  
Transition Metals ◽  
Direct Interaction ◽  
Acetone Solution ◽  
Group Vi ◽  
First Time ◽  
And Tungsten ◽  
Nuclear Magnetic

Complexes of the general formulae M(CO)3(dam)I2, M(CO)3(dam)2I2, and M(CO)2(dam)2I2 have been prepared and characterized [M = Mo, W; dam = bis(diphenylarsino)methane]. All of the compounds are diamagnetic and non-electrolytes in acetone solution. The tungsten derivatives were prepared by direct interaction of dam with diiodotetracarbonyltungsten(11), but the molybdenum analogues were obtained by iodine oxidation of the zero-valent complex Mo(CO)4(dam)2 whose preparation is reported for the first time in this paper. The bis(dam)tricarbonyl complexes, M(C0)3(dam)2I2, are unstable in solution giving M(CO)2(dam)I2 and free dam in equilibrium with undissociated complex. The bis(dam)tricarbonyl complexes also readily lose carbon monoxide, especially in the case of molybdenum, to give M(CO)z(dam)2I2. These dicarbonyl complexes readily absorb carbon monoxide to re-form the tricarbonyl complexes to give a reversible carbon monoxide carrying system. Overall, these systems may be represented by the general equations : M(CO)3(dam)I2 + dam ↔ M(CO)3(dam)2I2 + CO These equilibria have been studied using both infrared and nuclear magnetic resonance techniques.

Substituted carbonyl derivatives of the Group VI transition metals. IV. Reactions of some arene-metal tricarbonyls with Triaryl-phosphine and -arsine ligands

1973 ◽  
Vol 26 (3) ◽  
pp. 655 ◽  
Author(s):  
JA Bowden ◽  
R Colton ◽  
CJ Commons
Keyword(s):  
Carbon Monoxide ◽  
Solid State ◽  
Transition Metals ◽  
Steric Effects ◽  
Group Vi ◽  
Decomposition Products ◽  
Carbonyl Derivatives ◽  
Derivatives Of

The reactions of triphenylphosphine and triphenylarsine with (π- arene)M(CO)3 (M = Cr, Mo, W) to yield fac-M(CO)3(RPh3)3 (R = P, As) have been reexamined. Anomalies in the earlier literature have been resolved by the isolation of two solid state forms of each complex and by a study of the decomposition products of these compounds. Tricarbonyl complexes of tritolyl-phosphines and -arsines are also reported and their behaviour suggests steric effects initiate decomposition. In addition, a number of (π-arene)M(CO)3 compounds were shown to react with carbon monoxide to form M(CO)6.

Sign in / Sign up

Export Citation Format

Share Document