Neutral metal complexes, reaction with

Neutral metal complexes, reaction with carbonyl metallates, 30 152-155 Neutrons... 

This is the most common route to vinylidene complexes and occurs in reactions of the 1 -alkynes with metal complexes, preferably with labile neutral or anionic ligands, which give neutral or cationic complexes, respectively. In the latter case, halide is commonly extracted, either by spontaneous displacement by a polar solvent, or by using sodium, silver or thallium salts. 

The metal-promoted reactions with nucleophiles generally yield metal complexes of the intermediate imino species and it is quite unusual to observe the carboxylate products derived from the attack of a second equivalent of nucleophile. A wide variety of products have been observed. The ligands may be monodentate O- or A-bonded species, or exhibit a didentate N,0-mode. The ligands may be in the amide or the hydroxyimine tautomeric forms, and may be neutral or deprotonated (Fig. 4-8). 

We have been successful in decorating surfaces with neutral, metal complexes, (M" +)n(L )m having anionic ligands, L" that can be removed at low temperature by the reaction with surface protons to produce neutral species, HnL , by the following reaction ... 

Angelici and co-workers have ranked the acidity and the bond dissociation energies of about 50 cationic hydrides by protonating neutral metal complexes in CH2CICH2CI (DCE) with triflic acid (HOSO2CF3) and measuring the enthalpy of the reaction [53, 54]. These fall in the range of 10 to 40 kcal/mol. These results will be anion-dependent because of the low dielectric constant of this solvent. 

Reaction of metallates with neutral metal complexes. The reaction of cluster carbonyl metallates with neutral carbonyl compounds has proved to be very useful in the preparation of homo and heteronuclear derivatives ... 

Neutral carboranes and boranes react with transition-metal complexes forming metallocarboranes or metalloboranes, respectively. However, most metallocarboranes and metalloboranes are prepared from transition-metal halides and anionic carborane and borane species ( 6.5.3.4) or by reacting metal atoms and neutral boranes and carboranes. These reactions are oxidative addition reactions ( 6.5.3.3). 

Figure 3. Schematic illustration of core/shell nanoparticle formation via redox transmetalation process. Metal ions (Mu) of reactant metal complexes (Mn-L ) are reduced on the surface of Mi nanoparticles while neutral Mi atoms are oxidized to Mi " by forming a Mi-ligand complex (Mi-Lj) as a resultant reaction byproduct. Repeating this process results in the complete coverage of shell layers on core metals. (Reprinted from Ref [145], 2005, with permission from American Chemical Society.)...

---