Journal of Chemical Sciences

, Volume 112, Issue 6, pp 573–578 | Cite as

Investigation of properties of rare earth complexes with dibromo-p-methyl-methylsulfonazo by spectral correction technique

  • Hong-Wen Gao
  • Fa-Shui Hong
  • Qing-Song Ye


The reactions were sensitive between seven rare earth (RE) metals Nd(III), La(III), Ce(III), Pr(III), Sm(III), Eu(III) and Gd(III) and dibromo-p-methylmethylsulfonazo (DBMMSA) in acidic solution. The spectral correction method has been applied in the determination of properties of RE complexes instead of ordinary spectrophotometry. Composition ratios, real molar absorptivities (ε) and stepwise stability constants (K) of each of the RE complexes were determined easily because the method eliminated the absorption influence of excess of ligand on complex. Results showed that the cumulativeK values of the complexes were between 3.91 × 1014 and 2.34 × 1028 and the real (not apparent) absorptivity between 8.85 × 104 and 2.12 × 105 l mol-1cm-1 at 640 nm.


Spectral correction technique rare earth dibromo-p-methyl-methylsulfonazo (DBMMSA) 


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Copyright information

© Indian Academy of Sciences 2000

Authors and Affiliations

  1. 1.School of Chemistry and Chemical EngineeringAnhui UniversityHefeiP. R. China
  2. 2.Department of Biological ScienceHuaibei Coal Teachers CollegeHuaibeiP. R. China

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