Title of article :
Aggregation-induced sensitization in aqueous solutions of Al3+–chrome azurol S complexes and ionic liquids based on 1-alkyl-3-methylimidazolium bromide
Author/Authors :
Zhang، نويسنده , , Hucheng and Li، نويسنده , , Kun and Zhang، نويسنده , , Xuxu and Zhang، نويسنده , , Liwei and Wang، نويسنده , , Jianji، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2010
Pages :
7
From page :
77
To page :
83
Abstract :
The dependences of the absorption spectra of chrome azurol S (CAS) and Al3+–CAS complexes on the concentration of ionic liquids (ILs), 1-alkyl-3-methylimidazolium bromide ([CnMim]Br, with n = 8, 10, 12), were measured at 298.15 K in aqueous solutions with pH = 5.6. It is found that ILs can induce the significant red-shifts of the wavelength at the absorption maximum (λmax) of Al3+–CAS complex from 545 to 646 nm for [C8Mim]Br, and to 642 nm for [C12Mim]Br and [C16Mim]Br, respectively. Accompanying the red-shifts, the absorbance at λmax, and thereby molar absorptivity (ɛ), changes markedly with the IL concentration, and consequently the effect of ILs on the absorbance at λmax is systematically investigated in this work. Along with the experimental results of resonance light scattering, the sensitization mechanism is analyzed from the aggregation of the ILs and the interactions of ILs with CAS and Al3+–CAS complexes. It is shown that the hydrophobic interactions of IL subaggregates with CAS in Al3+–CAS complex are the crucial factor for the sensitization.
Keywords :
Sensitization , Dye , Aggregation , Absorption spectrum , Ionic liquid
Journal title :
Colloids and Surfaces A Physicochemical and Engineering Aspects
Serial Year :
2010
Journal title :
Colloids and Surfaces A Physicochemical and Engineering Aspects
Record number :
1939214
Link To Document :
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