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International Journal of Chemical Studies

Vol. 1, Issue 3 (2013)
Study on Complex Formation of Cu(II) with Water Insoluble PAN in Acidic Water, Using UV-Vis Spectrophotometer


Author(s): Khokan Chandra Sarker*, Md. Rafique Ullaha

Abstract: 1-(2-pyridylazo)-2-naphthal (PAN) is insoluble in water but soluble in organic solvent such as ether, alchohol, chloroform, and surfactant solution etc. but we have used acid and water to soluble PAN. The absorption spectrum of the PAN solution system in 1M HCl medium was recorded using the UV-Vis. spectrophotometer. The absorption spectrum of the PAN are a symmetric curve with the maximum absorbance at λmax=440nm which is different from organic media that is at λmax=427nm. Cu(II) at trace level form pink color complex with PAN in acidic media at pH 2.00 to 2.50. The amount of Cu(II)-PAN complex has measured by UV-Vis. spectrophotometer, PAN reacts in highly acidic solution with Cu(II) to give a pink chelate which has an absorption maximum (λmax.) that is 550nm. The reaction is instantaneous and absorbance remains stable for over 48 hrs. The average molar absorption co-efficient (ε) was found to be 2.05×104 L mol-1cm-1, Sandell sensitivity is 3.23×10−4 μg cm−2.

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(a). Absorption spectrum at different concentration of PAN (4.0×10-6M/L to 8.0×10-5M/L) at pH=2.5, λMax=440 nm in aqueous solution.
Fig. 1: (a). Absorption spectrum at different concentration of PAN (4.0×10-6M/L to 8.0×10-5M/L) at pH=2.5, λMax=440 nm in aqueous solution.

(b). Absorption of different concentration of PAN (4.0×10-6M/L to 8.0×10-5M/L) at pH=2.5, λMax=440 nm in aqueous solution.
Fig. 2: (b). Absorption of different concentration of PAN (4.0×10-6M/L to 8.0×10-5M/L) at pH=2.5, λMax=440 nm in aqueous solution.

(c). Absorption spectrum at different pH (1.00 - 3.00) of PAN (6.0×10-6M/L) at λMax=440nm in aqueous solution.
Fig. 3: (c). Absorption spectrum at different pH (1.00 - 3.00) of PAN (6.0×10-6M/L) at λMax=440nm in aqueous solution.

Pages: 42-46  |  1027 Views  10 Downloads

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How to cite this article:
Khokan Chandra Sarker*, Md. Rafique Ullaha. Study on Complex Formation of Cu(II) with Water Insoluble PAN in Acidic Water, Using UV-Vis Spectrophotometer. Int J Chem Stud 2013;1(3):42-46.
International Journal of Chemical Studies