In:
Journal of Chemistry, Hindawi Limited, Vol. 2016 ( 2016), p. 1-7
Kurzfassung:
Individual distribution constants ( K D , A ) of picrate ion (Pic − ) and extraction constants ( K e x ± ) of NaPic by some crown ethers (L) into benzene (Bz) at 25°C were calculated from data reported previously. These constants were defined as K D , P i c = P i c - o / [ P i c - ] and K e x ± = N a L + o P i c - o / ( N a + L o [ P i c - ] ) , respectively. Here, the subscript “o” denotes an organic (o) phase and practically o = Bz. 15-Crown-5 ether (15C5), 18-crown-6 one (18C6), and their monobenzo (B) derivatives (B15C5 and B18C6) were selected as L. Interfacial equilibrium-potential differences ( Δ ϕ e q ) at extraction were estimated at 298 K. A plot of log K e x ± versus - Δ ϕ e q for the four L extraction systems gave a straight line with slope = 84 V −1 . This slope was compared with those, reported before, of the dichloromethane (DCM), 1,2-dichloroethane (DCE), and nitrobenzene (NB) extraction systems. The slopes of the regression lines were in the order NB 〈 DCM ≤ DCE 〈 Bz. Also, the individual distribution constants of the complex ion N a L + and an ion-pair complex ( N a L + P i c - ) into Bz phase were calculated from the above extraction data. At least, a comparison between these values suggests that Bz molecules mainly interact with N a L + moiety of N a L + P i c - .
Materialart:
Online-Ressource
ISSN:
2090-9063
,
2090-9071
DOI:
10.1155/2016/5175746
Sprache:
Englisch
Verlag:
Hindawi Limited
Publikationsdatum:
2016
ZDB Id:
2393625-3
ZDB Id:
2703077-5
