Simultaneous determination of Stability Constant and Molar Absorptivity Coefficient of the Charge-transfer complexes of Metal – Alizarin Red S
By Laljee Yadav, Sharda S. Sanjay, Preyas Ankit, and Mahesh C. Chattopadhyaya
ABSTRACT
Anthraquinone dye, alizarin red S, has several important analytical applications. Its charge transfer complexes with metal ions will be a key for their applicatory uses. For that their various complexes with metal ions, viz., Cr(III), Cu(II), Pb(II), Th(IV) and UO2 (II) were studied spectrophotometrically with the help of a novel graphical method in which stability constants(logK) and molar absorptivity coefficient (Î0 ) of these complexes were determined simultaneously. Standard free energy(∆Go ), oscillator strength (f), energy of interaction(Ect) and resonance energy (RN) of the charge transfer complexes were also calculated.
Keywords : Alizarin red S, charge transfer spectra, chelation, stability constant, molar absorptivity.
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