Quinolinol derivatives

Extraction with 8-quinolinol derivatives, which can act as either a chelating acid or, after protonation, as an anion extractant. It was observed [35] that palladium extraction was favored at low acidity, but platinum was extracted best at high acidity (Fig. 11.16). At about 2 mol dm acid, the two metals were extracted equally. This suggested the following extraction equations ... 

Reactions of tropone 124 with phenylacetonitrile (62YZ892) and transformations of type 124 derivatives by several active methylene compounds (63MI2) result in rearrangements to form 8-quinolinol derivatives. (Thia-zolo[4,5-i)]tropones prepared from 124 will be treated in Section II,B,l,f.)... 

The dioxouranium(VI), or uranyl, ion is peculiar in forming two 8-quinolinol derivatives. Only the red crystalline compound containing an added mol of 8-quinolinol can be prepared by direct precipitation. This material has been recommended for the accurate determination of uranium-(VI)1,3,6,7 because of its insolubility, constancy of composition, ease of drying, and large molecular weight. 

Extension of these WL4 complexes to complexes not involving 8-quinolinol derivatives has included a number of substituted tetrakis-(picolinato)tungsten (IV) complexes (2, where Z = H, CH3, or C2H5 and the analogous 3-hydroxypicolinato complex) (3). Other species reported previously include the 2-pyrazinecarboxylato and 1-isoquino-linecarboxylato species, W(pzc)4 (3) and W(iqc)4 (4) (3), and the spectrally supported W(nq)4 and W(hqa)4 (2). Complexes not previously reported include W(tbq) 4 and the quadridentate Schiff base chelate W(dsp)2 (5 ), for which at least two isomers have been observed. 

Metal-ion MS-RTP determinations have also been demonstrated. For example, platinum(II) chelates with 8-quinolinol derivatives were found to form highly phosphorescent complexes at room temperature in the sugar-based -dodecyl-/l-D-maltoside micellar medium, using iodine as heavy atom (see Figure 2). 

Scheme 1 Some quinolinol derivatives used to prepare luminescent complexes with lanthanide ions ...

Quinolinol derivatives Quaternary ammonium salts Rhodanines... 

Quinoline derivatives are also dangerous for example, 8-quinolinol is especially toxic intraperitoneaHy, with an LD q (mouse) of 48 mg/kg. This... 

Certain halogen derivatives of 8-hydroxyquinoline have a record of therapeutic efficacy in the treatment of cutaneous fungus infections and also of amebic dysentery. Among these are 5-chloro-7-iodo-8-quinolinol [130-26-7] (iodochlorhydroxyquin, Vioform), 5,7-diiodo-8-hydroxyquinoline [83-73-8] (diiodohydroxyquin), and sodium 7-iodo-8-hydroxyquinoline-5-sulfonate [885-04-1] (chiniofon) (196—198). 

Dyrssen, D. Dyrssen, M. Johansson, E., Studies on the extraction of metal complexes. XXXI. Investigation with some 5,7-dihalogen derivatives of 8-quinolinol, Acta Chem. Scand. 10, 341-352 (1956). 

Seven-coordinate compounds [MoCILJ (L = anion of picolinic acid or a derivative of 8-quinolinol) have been prepared by prolonged reaction between [Mo02C12] and HL these... 

Compounds (20) and (21) undergo electrochemical oxidation to give films of poly(2-methyl-8-quinolinol) and poly(S-quinolinol) on a variety of metal substrates.60 Copper(II) can be com-plexed from aqueous media, but cobalt(II) requires an organic medium. X-ray photoelectron spectroscopy shows the copper(II) complex of films derived from (20) to be complexed to both N and O and also shows that water is absent from the primary coordination sphere. However, for cobalt(II) on the polymer derived from (21), water is present in the primary coordination shell. 

Copper 8-QuinoIinoIate (Copper-8). Copper 8-quinolinolate 3 is derived by reacting copper with quinolinol. This compound is... 

Warshawsky, A., Kalir, R., Patchornik, A. Interpolymeric reactions. The Fries rearrangement of acetoxy and benzyloxy derivatives of 4-hydroxy-3-nitrobenzylated polystyrene and 5-polystyrylmethyl-8-quinolinol. J. Am. Chem. Soc. 1978,100,4544-4550. 

New complexes containing azo- and hydrazinato-derivatized Schiff base ligands298 375 continue to be used for the analytical determination of vanadium.376 The vanadium complex was characterized for the Schiff base derived from the condensation reaction of benzoyl acetone and Girard s reagent P.377 Azophenolates of mononuclear and mixed valence dinuclear species have been reported.378 Naphthanol- or quinolinol-derivatized ligands prefer to chelate iron over vanadium.379... 

Derivation From 8-quinolinol and copper salt such as copper acetate. 

Zinc (and Cu) in brass and tap water were determined with the use of zincon after preliminary preconcentration on Chelex-100 column [3]. The application of V-hydroxy-AW-diphenylbenzamidine and diphenylcarbazone to the determination of zinc in airborne dust particulates has been described [4]. Trace amounts of zinc in standard alloys, environmental and pharmaceutical samples were determined by fourth derivative spectrophotometry using PAN as a reagent and ammonium tetraphenylborate supported on naphthalene as an adsorbent [5]. The detection limit was 9.5 ng ml Zn. Submicrogram amounts of zinc in water and rock samples were determined with 5-(2 -carbomethoxyphenyl)azo-8-quinolinol in the anionic micellar medium of sodium dodecyl sulfate [6]. 

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