caa a22 4500 465732364 CHVBK 20180323111745.0 cr unu---uuuuu 170327e19900801xx s 000 0 eng 10.1007/BF02035801 doi (NATIONALLICENCE)springer-10.1007/BF02035801 Synergism with amides [Elektronische Daten] I. Synergistic extraction of uranyl ion with thenoyltrifluoroacetone and some aliphatic amides [R. Veeraraghavan, S. Pai, M. Subramanian] Synergistic extraction of uranyl ion with 2-thenoyltrifluoroacetone (HTTA) and aliphatic amides with varying basicities, viz. dibutyl hexanamide (DBHA), dibutyloctanamide (DBOA) or dibutyldecanamide (DBDA) has been studied at various fixed temperatures of 20, 30, 40 and 50±0.1°C. Results indicate that the equilibrium constants of the organic phase addition reaction (Ks) with these amides follow their order of basicity (Kh) viz. DBHA (0.09)<0.10) H DBOA (0.13) with log Ks values of 4.91, 4.99 and 5.02, respectively. These values are much higher than those with TBP (3.8) or sulfoxides (≃4) as donors. This may be attributed to the existence of a resonance form of the amide, which has higher electron density on the carbonyl oxygen. The thermodynamic parameters associated with these systems evaluated by the temperature coefficient method indicate that the organic phase addition reaction with all the three amides is stabilized by both enthalpy and entropy changes as against UO 2 2+ /HTTA/TBP system, where only the enthalpy change contributes to the stabilization. Akadémiai Kiadó, 1990 Veeraraghavan R. Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, 400 085, Bombay, India aut Pai S. Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, 400 085, Bombay, India aut Subramanian M. Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, 400 085, Bombay, India aut Journal of Radioanalytical and Nuclear Chemistry Kluwer Academic Publishers 141/2(1990-08-01), 339-346 0236-5731 141:2<339 1990 141 10967 https://doi.org/10.1007/BF02035801 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02035801 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Veeraraghavan R. Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, 400 085, Bombay, India aut NATIONALLICENCE 700 1- Pai S. Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, 400 085, Bombay, India aut NATIONALLICENCE 700 1- Subramanian M. Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, 400 085, Bombay, India aut NATIONALLICENCE 773 0- Journal of Radioanalytical and Nuclear Chemistry Kluwer Academic Publishers 141/2(1990-08-01), 339-346 0236-5731 141:2<339 1990 141 10967 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer