Vol. 7, Issue 1 (2019)
Complexation of copper(ii) with 1-(2-pyridylazo)-2-naphthal solubilized in the micelle of Cetylpyridinium bromide in aqueous solution
Author(s): Khokan Chandra Sarker and Md Rafique Ullah
Abstract: The aim of the present work is to examine the possibilities of application of cationic surfactant, Cetylpyridinium bromide (CPB) in the solubilization-spectrophotometric methods for determination of metal ions in water. For this purpose, we have presented a Spectrophotometric procedure for the complexation of copper(ii) with PAN in the micelle of CPB in aqueous medium. Further on this, solubilization of 1-(2-pyridylazo)-2-naphthal (PAN) in aqueous solution of CPB has been investigated to measure the molar solubilization ratio (MRS) of PAN. Solubilization is a colloidal phenomena which is the process of incorporation of solubilizate into or onto the micelles. Micelle formation start at a certain concentration known as critical micelle concentration (CMC). Above CMC the rate of solubilization of PAN found proportional to the concentration of the surfactant. The objective of this study is also to measure the CMC of CPB investigating the solubilization of PAN in aqueous solution of the surfactant with the help of UV vis. Spectrophotometer. On the other hand solubilized PAN in the aqueous solution of the surfactant form colour complex with Cu2+ ion in the core of micelle. The colour of Cu(PAN)2+ complex is distinguished from the colour of PAN in the identical micellar system. The reaction of copper(ii) ion with PAN in micellar system is instantaneous and absorbance remains stable for more than 48 hours. Moreover, the Cu(PAN)2+ complex and PAN itself are insoluble in water whereas soluble in the micelle of CPB in aqueous solution. The maximum absorbance (λmax) of PAN in aqueous solution of pure CPB is 472nm. On the other hand Cu(PAN)22+ complex absorbs strongly at 550nm which is fairly different from PAN. The Spectrophotometric method have been applied to investigate the empirical formula of coloured Cu(PAN)2+ complex. The stoichiometry of the complex was determined by following slope ratio and molar ratio methods. The copper PAN complex obeys Beer’s law over the concentration range 8×10-7 to 2×10-5 M/L Copper(ii) ion. The molar absorptivity (ε) was found to be 2.28×104 L/mol/cm.
Pages: 211-218 | 477 Views 98 Downloads
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How to cite this article:
Khokan Chandra Sarker, Md Rafique Ullah. Complexation of copper(ii) with 1-(2-pyridylazo)-2-naphthal solubilized in the micelle of Cetylpyridinium bromide in aqueous solution. Int J Chem Stud 2019;7(1):211-218.
