Neutral metal complexes

Copper and chromium are used for complexing a number of dyes such as the coppered direct and reactive dyes for cotton and metaUi2ed and neutral metal complex acid dyes for nylon, wool, etc. Examples are Direct Blue 218 [28407-37-6] (Cl 24401) (317), Reactive Violet 2 [8063-57-8] (Cl 18157) (318), and Acid Black 52 [5610-64-0] (Cl 15711) (319). 

Outer sphere coordination of organic molecules to electrically neutral metal complexes. V. M. Nek-ipelov and K. I. Zamarawu, Coord. Chem. Rev., 1985,61,185 (136). 

The compounds may be purified by sublimation in vacuum. Dihydroazasilaboroles with vinyl substituents possess different coordination centers and consequently form different kinds of complexes when they react with neutral metal complexes" ... 

The effect of the water activity of the aqueous phase, discussed in Chapters 2, 3, and 6, is determined by the total concentration and nature of the salts. Generally, the distribution constant for a neutral metal complex would increase with increasing ionic strength, as Ulnstrated in Fig. 4.25. This salting-out effect is often ascribed to a redaction in free water available for hydration. On the other hand, the salt also breaks down the water structure, which could reduce the energy to form a hole in the phase. 

Figure 5.32 Formation of the neutral metal complex 59 covalently bonded to the zeolite substrate through the ligand via basic surface sites [191].

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

The neutral zinc complexes described in Figure 9.5 are proving to be quite remarkable compounds. Their preparation is simple and the synthetic yields are high (typically 70-90%). When one looks at the crude product, few if any side products are seen. Mechanical losses probably account for the less than perfect isolated yields obtained. The neutral metal complexes are typically freely soluble in various organic solvents (e.g., toluene, CH2CI2, CHClj, THF, dioxane, and acetonitrile) and partially soluble in methanol. They are generally insoluble in hexanes, diethyl ether or cold methanol, and these latter organic solvents can be used to precipitate the... 

The above results indicate that to synthesize a high-performance, low-73, PR polymer, a neutral metal complex that has an efficient photoinduced charge generation mechanism can be utilized as a photosensitizer. 

Oxidative addition where M (L) is a coordinately unsaturated neutral metal complex add two fragments R and X from rupture of the C—X bond ... 

Neutral metal complexes can be sufficiently nucleophilic to effect halide displacement from alkyl halides. These reactions, not discussed in detail here, are mechanistically similar to reactions involving anionic complexes, e.g ... 

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 ... 

The first molecular metal based on single component and electrically neutral metal complex, [Ni(tmdt)2] (tmdt = trimethylenetetrathiafulva-lenedithiolate. Figure 4.17) was reported in 2001. Details of this compound and some other single component molecular conductors are given in Section 4.3.4 and in several review articles. 

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. 

We have also determined aG values for electron attachment to a number of neutral metal complexes by charge-transfer bracketing and equilibrium experiments with organic acceptors (Figure 2). One metallocene, Cp2Ni, was known to form a stable negative ion from early studies by Beauchamp and coworkers (20). Many aG values have also been determined for electron attachment to the first row transition metal tris(acetylacetonate) (M(acac)3) and tris(hexafluoracetylacetonate)... 

Table 19 Indirect determination methods for organic compounds by formation of neutral metal complexes and measurement by FAAS of the coordinated metal. (Source M. Garcia-Vargas, M. Milla, and J. A. Perez-Bustamante, Analyst (London), 1983, 108, 1417 and references therein)...

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