Carbonyl halides of the Group VI transition metals. XI. Dithiocyanatocarbonyl derivatives of molybdenum and tungsten(II)

1968 ◽  
Vol 21 (6) ◽  
pp. 1435 ◽  
Author(s):  
R Colton ◽  
GR Scollary
Keyword(s):  
Transition Metal ◽  
Transition Metals ◽  
Ammonium Chloride ◽  
Pure State ◽  
Ammonium Thiocyanate ◽  
Donor Ligands ◽  
Group Vi ◽  
Derivatives Of ◽  
And Tungsten

Reaction of ammonium thiocyanate with dihalocarbonyls of molybdenum and tungsten(11) leads to the elimination of ammonium chloride and the formation of a dithiocyanatocarbonyl complex of the transition metal. Although the thiocyanatocarbonyls themselves have not been isolated in a pure state, a number of substituted derivatives with phosphorus donor ligands have been prepared and characterized. In general these complexes are less stable than the corresponding carbonyl halide derivatives.

Carbonyl halides of the Group VI transition metals. VII. Nitrosyl halide derivatives of molybdenum and tungsten(II)

1968 ◽  
Vol 21 (5) ◽  
pp. 1149 ◽  
Author(s):  
MW Anker ◽  
R Colton ◽  
IB Tomkins
Keyword(s):  
Nitric Oxide ◽  
Transition Metals ◽  
New Method ◽  
Natural Explanation ◽  
Group Vi ◽  
New Feature ◽  
Derivatives Of ◽  
And Tungsten

The previously reported dihalodinitrosylbis(triphenylphosphine)molybdenum and tungsten(11) type complexes, M(NO)2L2X2 (M = Mo, W; L = PPh3, AsPh3, SbPh3; X = Cl, Br), have been prepared by a new method involving the action of nitric oxide on the corresponding tricarbonyl derivatives. The new feature of this method is that, unlike the previous methods, it is not stereospecific, and in some cases all three possible cis isomers are formed. The identification of the various isomers has given a natural explanation of the apparently anomalous order of π-bonding effects in these complexes previously reported by Cotton and Johnson.

Carbonyl halides of the Group VI transition metals. XXVI. Nitrosyl halide complexes of molybdenum(II) and tungsten(II) with Bis(diphenyl-phosphino)methane and Bis(diphenylarsino)methane

1972 ◽  
Vol 25 (7) ◽  
pp. 1393 ◽  
Author(s):  
JA Bowden ◽  
R Colton ◽  
CJ Commons
Keyword(s):  
Nitric Oxide ◽  
Transition Metals ◽  
Direct Interaction ◽  
Group Vi ◽  
Halide Complexes ◽  
Derivatives Of ◽  
And Tungsten

The known polymeric molybdenum nitrosyl halides [Mo(NO)2X2 (X = Cl, Br) have been prepared by the action of nitric oxide on Mo(CO)4X2. Derivatives of these complexes with bis(diphenylarsino)methane (dam) and its phosphine analogue (dpm) were prepared by direct interaction. In addition, complexes containing dam were formed by the action of nitric oxide on M(CO)2(dam)2X2 (M = Mo, W; X = Cl,Br,I). All compounds isolated were of the form M(NO)2LX2 and M(NO)2L2X2 (L = dam or dpm). Differences between the nitrosyl halide derivatives and the corresponding carbonyl halide complexes are interpreted on the basis of a steric argument.

Carbonyl halides of the Group VI transition metals. VIII. Paramagnetic and diamagnetic dicarbonyl derivatives of molybdenum(II)

1968 ◽  
Vol 21 (5) ◽  
pp. 1155 ◽  
Author(s):  
R Colton ◽  
CJ Rix
Keyword(s):  
Electron Spin Resonance ◽  
Transition Metals ◽  
General Formula ◽  
Electron Spin ◽  
Group Vi ◽  
Spin Resonance ◽  
Derivatives Of

Complexes of the general formula Mo(CO)2L2X2 (L = pyridine (py), 2,2'- dipyridyl (dipy), 1,l0-phenanthroline (phen); X = Cl, Br) have been isolated. The pyrldine derivatives are yellow monomeric compounds which are paramagnetic, but the complexes with dipy and phen contain diamagnetic seven-coordinate cations and are correctly formulated as [Mo(CO)2L2X]+X-. Conductance, infrared, magnetic, and electron spin resonance studies have been carried out.

Carbonyl halides of the Group VI transition metals. XII. Isolation of halocarbonyls and halocarbonyl anions of molybdenum and tungsten

1968 ◽  
Vol 21 (11) ◽  
pp. 2657 ◽  
Author(s):  
JA Bowden ◽  
R Colton
Keyword(s):  
Transition Metals ◽  
Group Vi ◽  
Tetraethylammonium Salts ◽  
And Tungsten

Dibromotetracarbonylmolybdenum, Mo(CO)4Br2, and the dihalotetracarbonyltungsten compounds, W(CO)4X2 (where X = Cl, Br), have been isolated and characterized. These highly reactive compounds are all diamagnetic. The trihalotetracarbonyl anions [M(CO)4X3]- (M = Mo, W) have been isolated as their tetraethylammonium salts from the parent halocarbonyls. These yellow diamagnetic compounds are the first tetracarbonyl derivatives to be prepared from the parent halocarbonyls.

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