Abstract

Shaker L. Stefan*, B. Ei-Shetary, W. G. Hanna, S.B. El-Maraghy and M. S. Moez  

A series of complexes of 1 -phenyl-3-methyl-4-(x-phenylhydrazo)-5 -pyrazolone [where x= 2-OCH3, (i), 2-COOH (ii), 2-OH-5-CI (iii), 2-OH-5-CH3 Na-4-CH3 (v)] with trivalent lanthanide ions Ln(III) were investigated and used for determination of these ions by conductometric and spectral measurements. The results indicate the probable formation of 1: 1 and 1:2 chelates (metal: ligand). Solid chelates have been isolated and their structures established by elemental analysts and IR spectral data. The hydrazo stretching frequency of NH-N=is assigned in the range 1535 to 1520 cm-1, carbonyl band from 1670 to 1750, vM-N from 575 to 565 cm-1 and *M-O from 530 to 510 cm-1. Ln (III) coordinate with hydrazo-5-pyrazolone derivatives to form chelate rings with benzenoid type resonance through π-bonding from the metal to the ligand. The Yb3+ complexes with 2-hydroxy~5-methyl (iv) derivative were also investigated In solutions by spectro photometric studies and were very useful for micro determination of this element.

Spectrophotometric; Pyrazolone; Conductometric

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