TITLE:
Extraction Properties of Calix[4]arenes towards Sulphonated Dyes
AUTHORS:
Muhammad Israr, Faiza Faheem, Fozia T. Minhas, Asma Rauf, Saba Rauf, M. Raza Shah, Fazal Rahim, Kiramat Shah, M. I. Bhanger
KEYWORDS:
Calixarene Derivative, Complexation, Job’s Plot, Hildebrand and Benesi Equation, Association Constant
JOURNAL NAME:
American Journal of Analytical Chemistry,
Vol.7 No.2,
February
29,
2016
ABSTRACT: Extraction of
sulphonated dyes through supramolecular
interaction with calix[4]arene derivatives is being presented here. The
selectivity of calixarene derivatives namely piperidine derivative of calix[4]arene
(calix-1), 1-methyl piperazine derivative of calix[4]arene (calix-2), and
di-methyl amine derivative of calix[4]arene (calix-3) were evaluated initially
against reactive red 2 (RR-2), acid
black (AB), reactive blue 19 (B-19) and synthetic dye (D-2) by
liquid-liquid extraction experiment. The results showed that the above three
calixarenes possess excellent complexation abilities toward the selected dyes.
The stoichiometric ratio for the calixarene derivatives and dyes was estimated
through Job’s plot, whereas Hildebrand-Benesi equation was used to calculate formation
constant (Ks) and molar absorptivity (Δε) of complexes. The binding association (Ka)
and dissociation (Kd) constants were calculated by Scatchard plot
additionally to further support the complexation data obtained from
Hildebrand-Benesi equation. Conversely association constants from, both
Hildebrand-Benesi equation and Scatchard plot i.e. Ks and Ka favor strong binding interaction
between calix-1: D-2, calix-2: B-19, and calix-3: AB complexes. Thus present
study adeptly supports the complexation of calixarene derivatives for
sulfonated dyes.