Organometallic complexes dinuclear

The dinuclear [Fe(C5H5)(C0)2(CgH4S8-C8H4Sg)Fe(C5H5)C02] organometallic complex exhibits ligand-centered oxidation at a low potential [94]. The crystalline material that forms upon chemical oxidation with iodine contains both I3 and I5 anions and has a room temperature compressed pellet conductivity of 1.7 x 1CT4 S cm-1. 

Dihydrogen Complexes Related Sigma Complexes Dinuclear Organometallic Cluster Complexes Hydrogenation Isomerization of Alkenes Polynuclear Organometallic Cluster Complexes. 

Dinuclear complexes such as Mn2(CO)io, Cp2Mo2(CO)6, and Cp2Fe2(CO)4 serve as precursors for many organometallic complexes via reaction sequences involving formal oxidative addition across the M-M bonds, Eq. 25. Access to M-M BDE data can provide a convenient anchoring point for the determination of other M-X data. Pugh and Meyer [41] have used a redox equilibration technique that enables the determination of M-M bond strengths. 

A principal motivation in the study of dinuclear organometallic complexes is the hope that they can accomplish catalytic reactions that are not achievable by mononuclear complexes. There are a number of cases where metal-metal complexes are catalysts precursors. The most famous is... 

Praefcke and co-workers reported a series of disk-shaped, dinuclear or//5o-palladated benzalimine complexes, 116, which were the first example of organometallic complexes showing the nematic phase of disk-like molecules,... 

For examples of estradiol conjugates with dinuclear organometallic complexes, see Refs 317, 318. See also Scheme 31. 

M-H bonds are sufficiently weak that hydrides can also transfer H to C-C double bonds. Examples of H acceptors include methyl methacrylate, a-methylstyrene, and the dinuclear organometallic complex in Figure 3.39. The resulting radicals must be stabilized in order for H transfer to proceed at an appreciable rate. 

In the last twelve years, special attention has been devoted to photochemistry of the dinuclear organometallic complexes, since different structures undergo light excitation leading to ligand replacements, disproportionation, or to different redox reactions. Detailed data on the nature of the primary photo reaction and on the reaction intermediates are known and have been published for various metal n complexes, including complexes of the [Cp2M2(CO)4] type (M = Fe or Ru). 

Porter, L.C. and Fackler, J.P. Jr (1986) Structure of the first example of an organometallic dinuclear gold(II) complex possessing bonds to oxygen. Acta CrystaUographica, 42, 1128-1131. 

Bardaji, M., Laguna, A., Perez, M.R. and Jones, P.G. (2002) Unexpected ring-opening reaction to a new cyanamide-fhiolate ligand stabilized as a dinuclear gold complex. Organometallics, 21, 1877. 

The majority of gold(I) carbene complexes are pure organometallic compounds and the are out of the scope of this work. Some halide or triphenylphosphine carbene complexes are known and they will be considered here. Nucleophilic addition of alcohols or amines to gold-coordinated isocyanides is one of the best-established methods to obtain gold carbene derivatives. The reaction of H[Au(CN)2] with propene oxide and estirene oxide yields (cyano)carbene complexes (380) avoiding the intermediate step.2257 A cyclic carbene compound is obtained by reaction of a dinuclear isocyanide with amine (Scheme 32).2258... 

---