The crystal structure of some dicarbonyl allyl derivatives of substituted carbonyls of molybdenum

Mono- and binuclear bipyridyl derivatives of the Mo(η3-C3H5)(CO)2 fragment: structural studies and fluxionality in solution

“…As would be expected, the values of the bite angle are dictated by the stereoelectronic demands of the bpy skeleton. All distances and angles listed in Table 1 compare well with those found for related Mo(II)(h 3 -allyl)(CO) 2 bpy complexes [6,10]. The molecular assembling of the [{Mo(h 3 -C 3 H 5 )(CO) 2 (2,2?-bpy)} 2 (m-4,4?-bpy)] 2' cations and PF 6 ( counter-ions (complex 2) results in the most interesting crystal packing within this group, as shown by the view down the crystallographic plane [100] presented in Fig.…”

“…The axial position opposite the allyl ligand is occupied by bromine in 8 and a nitrogen donor, from 4-CN-py in 4, or from 4-Mepy in 5. The related complex [Mo(h 3 -C 3 H 5 )(CO) 2 (2,2?-bpy)(py)][BF 6 ], containing pyridine, also exhibits the same arrangement, the Mo Ã/N distances being comparable, though slightly longer [10]. This type of structure is also observed in the dicationic species 2 and 3, in which the axial position is fulfilled with a nitrogen donor, but belonging to the bridged ligand.…”

(η-Allyl)bromodicarbonyl(N,N'-di-tert-butylethanediimine)molybdenum(II), MoBr(C3H5)(C10H20N2)(CO)2

“…This configuration, the bond distances and the angles are consistent with those in similar complexes, in particular those described by Fenn & Graham (1972), Graham & Fenn (1969, 1970 (Johnson, 1976) plot showing 50% probability thermal ellipsoids. Fig.…”

Syntheses, structures, and dynamic properties of M(CO)2(η3-C3H5)(en)(X) (M=Mo, W; X=Br, N3, CN) and [(en)(η3-C3H5)(CO)2M(μ-CN)M(CO)2(η3-C3H5)(en)]Br (M=Mo, W)

“…However, these NMR signals can be assigned with the assistance of 1 H-1 H COSY and 1 H-13 C HMQC 2D NMR at 60°C. The broad carbon signals at 61.41 (C c ), 48.66 (C t ), 46.09 (C t , en), and 45.38 ppm (en) are consistent with a slower exchange rate for 8 at this temperature. In this case an attempted study of the fast allyl rotation in CD 3 CN did not succeed due to the decomposition of 8 in CD 3 CN at elevated temperatures.…”