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
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.