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《Chinese Journal of Analytieal Chemistry》 1995-12
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Dissociation Equilibrium of Bimolecular Associates of Methylene Blue

He Xiwen, Feng Xizeng, Shen Hanxi (Department of Chemistry, Nankai University, Tianjin 300071)  
Dissociation equilibrium of bimolecular associates (dimers) of methylene blue (MB) was studied thermodynamically. At 30-60℃, absorption spectra of aqueous solutions of MB showed only monomer and dimer bands. Spectral change with varying temperature suggested that a simple equilibrium between photosensitizer dimers and monomers existed in these solutions. From the temperature-dependence of monomer absorbance, values of dissociation constants K and dissociation enthalpy ΔH were estimated to be 3. 42×10-5(30℃)-4. 47×10-5(60℃) mol/L and 5. 4×105J/mol, respectively.
【Fund】: 国家自然科学基金资助课题
【CateGory Index】: O657.3
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