Fluorinated complexones

Yellow Alizarin Complexone (AC) reacts with La or Ce(III) ions to form a red chelate, which, in turn, reacts with fluoride ions to give a blue ternary complex (Alizarin Fluorine Blue). The fluoride anion displaces the water molecule bound with the metal ion (formula 20.1) [19,20]. Other suggestions regarding the mechanism of this reaction have also been proposed [21,22]. 

The use of alizarin-lanthanum complexonate has been described for the determination of fluorine in soil [1] and plant samples [2]. The method for fluoride determination in natural waters based on the decrease in colour intensity of the Th bromocresol orange complex in the presence of F was presented [3]. 

A new type of ceramic membrane electrode that is selective for F" ions has been prepared by sintering LaFg, EuFj, and CaFz at above 1200 °C in an atmosphere of Hf The approximate determination of the F" ion concentration in polluted waters can be made by means of a F ion electrode in the presence of citrate ion however, for an accurate determination a photometric method was applied after separation of F by distillation. The probable composition of the La " -alizarin complexone (H4A)-F complex is said to be La(LaA)4F2. ° Alizarin fluorine blue 5-sulphonate is more soluble in water than the unsulphonated reagent the ternary La -F -complexone absorbs at 583 nm. The application of neutron activation analysis to the determination of fluorine has has been reviewed briefly by Verot and Jaumier. X-Ray photoelectron spectroscopy (p.e.s.) has been used to identify and to provide a quantitative estimate of CF3, CF2, and CF groups on the surface of fluorinated diamond. Proton and deuteron radiolysis of... 

Recent investigations have been devoted to the measurement of fluorides [91]. A ternary complex colored by fluoride ion is formed from a cerium(III)-alizarin complexone binary complex (alizarin fluorine blue). The reagent is immobilized on an Amberlite polymer matrix. The reflectance is measured in a flow-cell assembly with a bifurcated optical flber. The response is linear for 0.16-0.9S mM fluoride at pH 4.1. The response time is about 12 min. The major interferents are aluminium, iron, and phosphate. 

The condensation product of dihydroxyanthraquinone with formaldehyde and iminodiacetic acid was introduced by Belcher, Leonard and West (1958) under the name alizarin complexan (58), though the names alizarin complexone or (nowadays) alizarin fluorine blue are preferred. It greatly resembles xylenol orange in its general behaviour though its complexes with thorium and the lanthanons are more stable than these EDTA complexes. However, the most interesting... 

H-(Carboxymethyl)- -[(9,10-dihydro-3,4-dihydroxy-9,l0-dioxo-8-sulfo-2-anthraceny[)methyl glycine, 9CI. Alizarine fluorine blue sulfonate. 5-Sulfoalizarin complexone [55671-62-0]... 

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