Cu2+-Induced Micellar Charge Selective Fluorescence Response of Acridine Orange: Effect of Micellar Charge, pH, and Mechanism

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• 作者：Amit K. Ghosh ; Avik Samanta ; Prasun Bandyopadhyay
• 刊名：Journal of Physical Chemistry B
• 出版年：2011
• 出版时间：October 20, 2011
• 年：2011
• 卷：115
• 期：41
• 页码：11823-11830
• 全文大小：1026K
• 年卷期：v.115,no.41(October 20, 2011)
• ISSN：1520-5207

文摘

Photophysical properties of cationic Acridine Orange (AO) have been studied in different micellar environments [anionic SDS (sodium dodecyl sulfate), nonionic TX (TritonX-100), and cationic CTAB (cetyl trimethyl ammonium bromide)] at different pH, in the presence of a metal ion (Cu²⁺). At pH 8, addition of Cu²⁺ results in AO fluorescence quenching in the presence of SDS micelle, enhancement of the same in the presence of TX micelle, and remaining unaltered in the presence of CTAB micelle. At pH 2, addition of Cu²⁺ results in AO fluorescence quenching only in the presence of SDS micelle, and it remains mostly unaffected in the presence of TX and CTAB. Availability of Cu²⁺ toward AO and binding of Cu²⁺ with AO at the charged micellar interface are responsible for this pH-dependent Cu²⁺-mediated micellar charge selective fluorescence pattern.