Conductometric and Spectrophotometric Studies on Cerium (IV)-, Praseodymium(III) - and Gadolinium (Ill)- 2,2' - Bipyridyl and 2,2',2"-Tripyridyl Complexes
| Main Authors: | R. M. AWADALLAH, M. K. SHERIF, T. I. EL DESOUKY |
|---|---|
| Format: | Article Journal |
| Bahasa: | eng |
| Terbitan: |
, 1984
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| Subjects: | |
| Online Access: |
https://zenodo.org/record/6325454 |
Daftar Isi:
- Chemistry Department, Faculty of Science, Aswan, A. R. Egypt Manuscript received 9 August 1982, revised 24 December 1983, accepted 9 March 1984 The chelating behaviour of 2,2'-bipyridyl (bipy) and 2,2',2"-tripyridyl (tripy) have been studied with Ce4+, Pr3+ and Gd3+ spectrophotometrically at pH 1.5·11.0 and by conductometric titration and conductometric measurement. 2,2' -Bipyridyl and 2,2' ,2"- tripyridyl are recommended as suitable reagents for the spectrophotometric determination of Ce, Pr and Gd and form complexes of the types 2 : 1, 1 : 1, 1 : 2, 1 : 3 and 1 : 4 at variable pH. The order of increasing stability constant is Pr3+->Ce4->Gd3+-bipy> Pr3+->Ce4+->Gd3+,tripy ( 1: 1 ). The free energy changes (\(\bigtriangleup\)oG) of the complexes are determined.