Molybdenum binuclear complexes

In the earlier examples, the binuclear complexes with a M02S3 core clearly cannot be seen as modeling the metal sites in FeMo—co since it is known to contain a single molybdenum center [74]. However, what is suggested by these studies is that several steps (if not all) of the reduction of dinitrogen to ammonia by Mo-nitrogenase could take place at a... 

The reactions of dinuclear thioaldehyde and -ketone complexes with PR3 take a different course. When the dimeric complexes 112 are treated with PMe3 a Ti-S bond in 112 is cleaved and the monomeric complexes 113 are reversibly formed (see Scheme 26), 69 The reaction of 112 with benzene-thiol led to a Ti-C cleavage and formation of 1,3-propanedithiolato-(phenylthiolato) complex.69 The reaction of binuclear p-191 rf-thioketone molybdenum complexes related to 115 (M = Mo, E = S, R = Aryl) with P(OEt)3 also gave mononuclear complexes [Mo(CO)2(Et) i72-S = C(Aryl)2 (i75-C5H5)] by a rather complicated reaction sequence. When other phosphites were employed additionally binuclear complexes derived from addition of the phosphite to one molybdenum atom were isolated.225... 

In 1980 we published a survey (1) of our major results in this area as of late 1979. These results include extensive work on binuclear CF N PF complexes of cobalt (2,3,4,5) and nickel (6). This paper summarizes our more recent results in this area with particular emphasis on binuclear complexes of chromium, molybdenum, and tungsten as well as some new results on iron carbonyl derivatives. 

Among molecular complexes recently obtained by the ligand-exchange method we emphasize the coordination compounds of diorganoditellurides. Thus, the interaction (3.128) of molybdenum hexacarbonyl with diphenyltelluride in THF leads to the formation of a binuclear complex 705 [272] ... 

Binuclear complexes with 17e molybdenum fragments of the type Mo(NO)Tp Cl or MoOTp Cl lead to larger couplings, as shown by Ward, McCleverty and coworkers. With 4,4 -bipyridine or 4,4 -bipyridylethylene as bridges (Rmm = 113 and 13.8 A resjjectively), the couplings (-33 and —18 cm" ) could be measured by... 

The photolyses of a series of binuclear molybdenum carbonyl complexes containing alkyne ligands have been studied in frozen Nujol matrices at 77 K. IR spectra indicated the formation of two isomeric carbonyl-loss products in each case, one of which seems to be formed by photolysis into the... 

Reaction of 1 with the metal carbonyls of chromium, molybdenum, and tungsten in dimethylformamide (DMF) gives air-stable, binuclear complexes of t5q>e [(COlsMLMCCOls] (9). These proved to be useful starting species for generating (via oxidative decarbonylation reac-... 

The violet color which is observed during reactions (89) and (90) was found to correspond to the formation of a bimolecular molybdenum complex [Mo203(S2CN(n-Pr)2)4]. The authors have shown that the binuclear complex can be formed by reaction of phosphine with X, equation (91), and from a disproportionation reaction between X and [MoO(S2CN(n-Pr)2)2], equation (92). 

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