Enyl complexes structures

Enyl complexes (continued) reactivity, 8, 373 reductive elimination, 8, 380 structure and bonding, 8, 368 thermal decomposition, 8, 374 via transmetallation, 8, 367 transmetallation to metals, 8, 374 with niobium, 5, 87 with Pd 7i-complexes... 

Parameters for the -perfluoroallylcobalt complex [164], formed by the reaction of perfluoroallyl iodide with Zn[Co(CO)4)2 are given with the structure. (85) The prop-l-enyl complex [165], identified as trans about the double bond by the large value of 7(F-F), was also formed, and an octet at 3 -41-6, with coupling constants similar to those of... 

Finally, consider the complex C7H7Co(CO)3 whose structure is unknown but may be predicted using the 18-electron rule. At first sight the complex appears to be a 7 -f 9 -f 6 = 22 electron complex. It is therefore proposed that the C7H7 ring only contributes three electrons to the cobalt, rather than seven, and that instead of being the jr-cycloheptatrienyl complex, I.l, it is the Ti-enyl complex 1.2 ... 

Three iridium complexes of formula [Ir(acac)(L)2] have been synthesized, [k(dpp)2 (acac)], [Ir(bpp)2(acac)j and [Ir(fpp)2(acac)j, where L is a substituted arylpyridine (dpp = 2,4-diphenylpyridine bpp = 2-(4-f-butylphenyl)-4-phenylpyridine fpp = 2-(4-fluoroph-enyl)-4-phenylpyridine). The OLEDs based on these materials, with structure ito/Ir com-plexipvk/F-tbb/Alqs/LiF/Al (F-tbb = l,3,5-tris(4-fiuorobiphenyl-4 -yl)benzene), showed maximum luminances of 8776, 8838 and 14180 cdm , and maximum external efficiencies of 11.5, 12.9 and 17.0 cdA, repectively ° . 

The reaction of 1,2,3-triphenylcyclopropenylium ion 28 with sodium dicarbonyl(// -cyclopen-tadienyl)ferrate afforded the tr-complex, dicarbonyl(f -cyclopentadienyl)(l,2,3-triphenylcy-cloprop-2-enyl)iron (29), whose structure was determined by X-ray crystallography." Complex 29 was transformed into the original cyclopropenylium ion or its dimer by various reagents."... 

The reaction of 1,2,3-triphenylcyclopropenylium tetraduoroborate (28) with sodium pentacar-bonylrhenium afforded the cycloprop-2-enyl-rhenium complex 39. Upon ultraviolet irradiation or heating, complex 39 split off one carbonyl ligand to give the rhenacyclobutadiene complex 40, which was in equilibrium with the )7 -cyclopropenyl-rhenium rr-complex 41. The structure of 40 was determined by X-ray crystallography. ... 

Bis(thiocarboxylato) niobium 18Nb(RCOS)2 [207] and bis(r] -cyclopenta-di-enyl)bis(thiobenzoato)niobium 19 [110] have been synthesized by stoichiometric reactions of NbCl2 with sodium thiocarboxylates and of Nb(Cp)2X2 (X=C1, Br, I) with thallium thiobenzoate, respectively. The structure of 19 is considered to be analogous to the tantalum complex 20, in which the thiocar-boxylato ligands are monodentate through the sulfur atom [110]. 

Whereas the cyclobutane rings in (8 X = O or S) are planar, that in (9) is puckered, and two short Br Br distances of 3.55=A are observed in the crystals. Planarity is also seen in ds-cyclobutene-3,4-dicarboxylic acid and in substituted cyclopentadi-enyl cobalt complexes of tetraphenylcyclobutadiene, in which each metal atom is sandwiched between parallel, planar fo ir- and five-membered rings. Crystal structures have been obtained for a variety of polycyclic compounds containing cyclobutane rings. ... 

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