Paper Information

Journal:   JOURNAL OF THE IRANIAN CHEMICAL SOCIETY(JICS)   MARCH 2011 , Volume 8 , Number 1; Page(s) 166 To 175.
 
Paper: 

APPLICATION OF MULTIVARIATE CURVE RESOLUTION ANALYSIS FOR STUDYING THE THERMODYNAMICS OF METHYLENE BLUE AGGREGATIONS IN AQUEOUS SOLUTIONS

 
 
Author(s):  HEMMATEENEJAD B.*, ABSALAN G., HASANPOUR M.
 
* DEPARTMENT OF CHEMISTRY, SHIRAZ UNIVERSITY, SHIRAZ 71457, IRAN
 
Abstract: 
In water, methylene blue (MB) is known to be aggregated to dimmer and trimmer at high concentration levels. We conducted a thermodynamic study on the aggregation of MB using multivariate curve resolution analysis of the visible absorbance spectra over a concentration range of 2.0x10-6-4.0x10-4 M. A hard modeling-based multivariate curve resolution method was applied to determine the dissociation constants of the MB aggregates at various temperatures ranging from 25 to 75°C. This method was able to resolve the visible absorbance spectra as a function of MB concentration in individual temperature or simultaneously in all other temperature ranges. Utilizing the van, t Hoff relation, the enthalpy and entropy of the dissociation equilibriums were calculated. For the dissociation of both aggregates, the enthalpy and entropy changes were positive and negative, respectively.
 
Keyword(s): MULTIVARIATE CURVE RESOLUTION, METHYLENE BLUE, AGGREGATION, CHEMOMETRICS, THERMODYNAMICS, AQUEOUS SOLUTION
 
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