Cu(II), Ni(II) complexation with acid alizarine blue B in the presence of cetyltrimethylammonium bromide

The coordination reactions of Cu(II) and Ni(II) with acid alizarine blue B (AABB) in the presence of cetyltrimethylammonium bromide (CTAB) micelle were investigated using the microsurface adsorption-spectral correction technique (MSASC). The aggregation of AABB on CTAB followed the Langmuir isothermal adsorption law. The enrichment of AABB on CTAB sensitized the complexation between Cu(II) or Ni(II) and AABB. The binding ratio of AABB to CTAB was 1:2.5, and monomeric aggregate, AABB(2)CTAB(5), was formed with an adsorption constant of 5.95x10(5) at 20 degrees C or 2.48x10(5) at 40 degrees C. In the ternary complexation, the ratio of AABB:Cu and AABB:Ni were 1:1 and 1:2.5, respectively. Two types of aggregates, Cu-2 center dot AABB(2)center dot CTAB(80) and Ni-5 center dot AABB(2)center dot CTAB(80), were formed.