부산대학교 도서관

It is experimentally established that teraphthal (cobalt octa-4,5-carboxyphthalocyanine heptasodium salt) in the acid form (teraphthal acid) and the products of its esterification with poly(ethylene glycol) methyl ester in acid solutions possess equal absorbances (molar absorption coefficients) for the absorption maximum at 326 nm. The solutions under consideration obey the Bouguer — Lambert — Beer law, which (together with the equality of molar absorption coefficients of said compounds) is evidence for the absence of micelle formation and/or intermolecular association under the experimental conditions studied. Two methods of rapid quantitative determination and standardization of teraphthal acid derivatives have been developed: (i) a spectrophotometric method based on the absorbance at 326 nm determined for teraphthal in acid solutions and (ii) a volumetric method consisting in the wet mineralization of an accurately weighed amount of the product and the determination of cobalt(II) ions by direct titration with a Trilon B solution. [ABSTRACT FROM AUTHOR]