Quinolines zinc complexes

Quinaldine zinc complexes, 952 Quinolines metal complexes, 952 zinc complexes, 952 Quinones photoreduction zinc complexes, 994... 

Polymers containing 8-hydroxyquinoline appear to be selective adsorbents for tungsten in alkaline brines (95). In the presence of tartrate and citrate, quinaldic acid [93-10-7] allows the separation of zinc from gallium and indium (96). Either of these compounds can selectively separate lead and zinc from oxide ores as complexes (97). It is also possible to separate by extraction micro quantities of rhenium(VII), using quinoline in basic solution (98). The... 

One of the drawbacks of the Skraup/Doebner-von Miller reaction is the isolation of the desired product from the starting aniline and co-formed alkyl anilines and 1,2,3,4-tetrahydroquinaldine. Isolation can be simplified greatly by addition of one equivalent of zinc chloride at the end of the reaction all of the basic products were precipitated. Washing the brown solids with 2-propanol removed all impurities and left the desired quinoline as a 2 1 complex with zinc chloride in yields of 42-55%. 

Trinuclear zinc carboxylate structures of the form MZn2(MeCH=CHC02)6(quinoline)2 have been structurally characterized with M = Mn, Co, Ni, Zn, Cd, Mg, Ca, Sr. Structural variation is observed for the group 2 metals. The remaining complexes all show linear trimers with the central metal atom octahedrally coordinated and linked to each zinc by two bidentate and one mono-dentate carboxylate.377 A basic benzoate octanuclear structure with four vanadium(III) and four zinc atoms has been characterized, [VZnO(benzoate)3(TF[F)]4-2TnF.378... 

Irving, Cabell, and Mellor found that 2-methyl-l,10-phenanthroline is a stronger base than 1,10-phenanthroline yet it forms weaker complexes with Fe(II). The relative instability of the Fe(III) complex with 1,10-phenanthroline compared with the Fe(n) complex also seems to be due, at least in part, to steric hindrance. Steric hindrance plays an important role in the use of the reagent 2-methyl-8-hydroxy-quinoline, which precipitates zinc and magnesium but not aluminum. ... 

In a calorimetric study of the protonation of 8-hydroxyquinoline-5-sulphonate, Gutnikov and Preiser [Gu 68] established that the heat of the protonation of the ligand-oxygen is smaller in a 50% dioxane-water mixture than in water, whereas that of the quinoline-nitrogen is scarcely affected. A study of the nickel(II), copper(II), and zinc(II) complexes of this ligand showed that the stability increase in the water-dioxane mixture manifests itself in a change in both the enthalpy and the entropy. 

When 65d-i were heated in quinoline with various organic (acetate of zinc) or inorganic (chlorides of other metals) salts in the presence of urea and tributylamine the zinc, vanadium, copper, aluminum, cobalt complexes 129d-p,s have been obtained (1996CJC508). 

Zinc(II) chloride-tetramethylethylenediamine complex (4.23 g, 16.7 mmol), 1,10-phenanthroline (101 mg, 0.56 mmol), and benzo[/t]quinoline (1.00 g, 5.6 mmol) are placed in a Schlenk tube. To this mixture a solution of phenylmagnesium bromide (33.5 mL, 1.00 M, 33.5 mmol) in tetrahydrofuran is added dropwise at 0 °C. After stirring for I h, a 0.1-M solution of tris(acetylacetonato)iron in tetrahydrofuran (5.6 mL, 0.56 mmol) and 1,2-dichloro-2-methylpropane (1.42 g, 11.2 mmol) are sequentially added. The reaction mixture is stirred at 0 °C for 16 h and is quenched by the addition of a saturated aqueous solution of sodium bicarbonate (40 mL). After extraction with ethyl acetate (25 mL, 3 times), the organic layer is dried over sodium sulfate and concentrated under reduced pressure. The crude product is purified by silica gel chromatography (eluent first hexane to elute the biphenyl, then toluene) to afford 10-phenylbenzo[A]quinoline as a colorless solid mp 90.6-92.5 1.39 g (98%). ... 

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