Dithiocarbamate complexes tungsten

In attempts to synthesize tungsten alkylidyne complexes containing chelating anionic donor ligands we investigated the reactions of the bis-pyridine-substituted complex 1 with dithiocarbamate ligands and with pyrrole-2-carboxaldehyde methylimine in the presence of... 

Another widely utilized method involves the oxidative-addition of thiuram disulhdes to metal centers (Eq. 15) a reaction that has been reviewed by Victoriano (25, 170). Dithiocarbamate complexes of a number of transition metals can be prepared via this method, with examples at vanadium (171-173), molybdenum (174-180) and tungsten (181-183) being particularly prevalent. 

Tungsten(ni) tris(dithiocarbamate) complexes are not known. However, in one report a related tungsten(III) complex, [W(S2CH)(S2CNMe2)2] (152), has been reported prepared as a side product of the addition of carbon disulfide and sulfur to [W2(NMe2)6] (1051). 

Electrochemical recognition, 39 80 anions, macrocyclic and acyclic polycobalti-cinium ligand systems, 39 134-140 cations, 39 81-133 ammonium cation, 39 128-133 crown ether and bis crow ether ligands containing bipyridyl transition metal recognition sites, 39 111 crown ether dithiocarbamate and dithi-olene complexes, 39 123-124 di-h-cyclopentadienyl-molybdenum(IV) and -tungsten(IV) crown ether complexes, 39 107-108... 

Bisalkyne cyclopentadienyl derivatives of molybdenum and tungsten have been prominent in the development of Group VI alkyne chemistry in the 1980s. Unlike the dithiocarbamate systems where addition of a second alkyne produces a substitutionally inert bisalkyne derivative, interconversion of monoalkyne and bisalkyne cyclopentadienyl complexes is facile and synthetically useful. 

Electronic transitions assigned to the dir manifold produce the brilliant colors which characterize M(CO)(RC=CR)(B—B)2 complexes. A study of 20 dithiocarbamate derivatives reported transition energies ranging from 13,500 to 17,500 cm-1 with e between 70 and 120 Af-1 cm"1 for molybdenum while tungsten absorption maxima ranged from 15,800 to... 

---