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Potentiometric and Thermodynamic Studies of 3-(Trichlorophenylsulphonamido)rhodanine Complexes with Some Metal Ions

100%

Hassanein A.

tom Vol. 74, nr 7

903-907

Acid dissociation and complex stability constants of 3-(tricholophenylsulphonamido)rhodanine (TCSR) with some metal ions were determined potentiometrically in 0.1 KCl and 30% (v/v) sthanol-water mixture. The sequence of stability constants is: Th4 UO2+ 2 Cu2+ Ni2+ Co2+ n2+. The dissociation constants pK11 of TcSR and the stability constants log K of their complexes were determined at 298, 308 and 318 K. The corresponding therodynaic paraeters (deltaG, deltaH and deltaS) were derived and discussed. The dissociation process is non-spontaneous, endothermic and entropically unfavourable. The formation of the metal complexes has been found to be endothermic and entropically favourable.

Sodium nitroprusside mitigates the inhibitory effect of salt and heavy metal stress on lupine yield and downregulates antioxidant enzyme activities

51%

Hassanein A. , Esmail N. , Hashem H.

nr 3