Cadmium mixed ligand

Bivalent zinc, cadmium, nickel, and copper have been found to form ternary mixed-ligand complexes with histidine or edta and polyphenols.268 The formation constants for the ternary complexes are less than those for the binary systems. 

The cadmium(ll) chelate of the tripodal tetradentate ligand tren also yielded the mixed-ligand complex cation of the salt [Cd(tren)(xan)]C104 H20 [29], where the metal ion is only five-coordinated and the anionic xan ligand forms the Cd-N7 bond (2.224 A) reinforced by the intramolecular interligand H-bond (tren)N-H" 06 (2.889 A, 117.6°). In the compotmd traui-[Cd(theo)2(H20)4]-2DMF [30], each theophilinate(l-) anion binds the cadmium(ll) center by the Cd-N7 bond (2.300 A) in cooperation with an intramolecular H-bond (aqua)0-H - 06 (2.689 A, 158.5°). 

Typically, soHd stabilizers utilize natural saturated fatty acid ligands with chain lengths of Cg—C g. Ziac stearate [557-05-1/, ziac neodecanoate [27253-29-8] calcium stearate [1592-23-0] barium stearate [6865-35-6] and cadmium laurate [2605-44-9] are some examples. To complete the package, the soHd products also contain other soHd additives such as polyols, antioxidants, and lubricants. Liquid stabilizers can make use of metal soaps of oleic acid, tall oil acids, 2-ethyl-hexanoic acid, octylphenol, and nonylphenol. Barium bis(nonylphenate) [41157-58-8] ziac 2-ethyIhexanoate [136-53-8], cadmium 2-ethyIhexanoate [2420-98-6], and overbased barium tallate [68855-79-8] are normally used ia the Hquid formulations along with solubilizers such as plasticizers, phosphites, and/or epoxidized oils. The majority of the Hquid barium—cadmium formulations rely on barium nonylphenate as the source of that metal. There are even some mixed metal stabilizers suppHed as pastes. The U.S. FDA approved calcium—zinc stabilizers are good examples because they contain a mixture of calcium stearate and ziac stearate suspended ia epoxidized soya oil. Table 4 shows examples of typical mixed metal stabilizers. 

Solvated trifluoromethylzinc has also been prepared by ligand exchange reaction of dialkylzincs with bis(trifluoromethyl)mercury or cadmium (equation 2)110,11. Varying the reactant ratios led to mixed alkylperfluoroalkylzincs. 

The preparation of some mixed ethylenediamine-oxalate or other ligand complexes of cadmium(Il) has been reported.190-192 The reaction of a mixture of cadmium oxalate and CdX2 (X = Cl, Br, I or SCN) with ethylenediamine gives the complexes Cd(en)X(C204)o.s. The... 

Organic ligands added to sol solutions can be used to control NC growth and size dispersities. " This approach, analogous to the method described for metal NCs in Section 2.1, employs bifunctional linkers to tether metal salts to the sol-gel network to improve the homogeneity of the sample. Silica precursors mixed with 3-aminopropyltriethoxysilane (APTES) and cadmium nitrate were allowed to gel. Following oxidative treatments, the resulting CdO particles were converted to CdS upon exposure to H2S, as shown in equation (4). The size distribution of particles was much narrower under these conditions than when APTES was omitted from the reaction. 

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