Formation and Solubilization of Copper (II) Complexes in Micellar Solution of Amphoteric Surfactant, N-Decyl-β-alanine

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Abstract
The formation and solubilization of copper (II) complex in aqueous solution of N-decyl-β-alanine (NDeA) were investigated. When NDeA was dissolved in aqueous copper (II) chloride solution (2 mM), blue fine crystals of NDeA-copper (II) complex, [Cu(NDeA)2(H2O)2], precipitated. Below cmc (13 mM) of NDeA, the amount of precipitate increased with the concentration of NDeA. At the concentration above cmc, the amount of precipitate decreased because the precipitated complex was self-solubilized in the NDeA micelle. The visible spectra (absorption maximum, λmax=630 nm) of the solubilized copper (II) complex of NDeA were almost the same as the visible diffuse reflection spectra of the complex in the crystalline state. The environment in the vicinity of the coordination sphere of the solubilized complex would thus appear to be similar to that of the crystalline complex. For the NDeA micellar solution solubilizing the copper (II) complex of NDeA, a multibilayer structure with a long spacing of 3.56 nm was observed by dynamic light scattering and low angle X-ray diffraction measurements. A solubilization model is proposed in which extended complex molecules of the trans form are incorporated between bilayers in the lamellar micelle of NDeA.

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