A fairly simple, selective and non-extractive spectrophotometric method for the determination of trace amounts of silver (I) was developed and 2,2 ' ,3, suggested as a new analytical reagent for the direct non-extractive spectrophotometric determination of silver (I). In the aqueous medium TSNAB reacts with silver to give a highly orange absorbent chelate with a molar ratio of 1:2 (Ag: TSNAB). Note that the reaction is instantaneous and the maximum absorption was obtained at 490 nm that remains stable for 24 h. The average molar absorptivity and Sandell's sensitivity were found to be 1.37×10 4 l mol -1 cm -1 and 8.0 mkg cm -2 of silver(I) respectively. Linear calibration graphs were obtained for 0.864-5.184mkgml −1 of silver(I). A large excess of over 30 cations, anions and complexing agents impedes no determination. The non-extractive method is rather selective for silver(I) to have been successfully applied to synthetic mixtures.
A new organic reagent based on benzoylacetone, 3-(4'-fluorophenylimine)-1-phenylbutanone-1 was synthesized and its crystal structure determined by X-ray structural analysis. Reagent crystals are monoclinic: a=6.4520(6) Ǻ, b=28.685(2) Ǻ, c=7.2003(6) Ǻ, α=90°, β=91.163(2)°, γ=90°, V=1332.3(2)Å 3 , space group P2 1 /n, Z=4. Results of X-ray diffraction analysis showed that the reagent molecule in the crystal has trans-configuration. The reagent dissociation constant (pK = 9.89 ± 0.05) and the stability constants of its complexes with some metals were determined by means of potentiometric titration.method The complexation of the reagent with iron (III) in the presence of dianthipirilmethane and its homologsdiantipyrylphenylmethane and diantipyryl-o-oxyphenylmethane was studied spectrophotometrically. A highly selective method for the direct determination of iron micro-quantities in red and Hovsani onions developed.
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