Aggregation of poly(allylammonium) chloride (PAAH+C1 -) and sodium 1-octanesulfonate (Na+OcS -) has been examined by the energy transfer from 2-naphthalenesulfonate ion (2-NpS-) to 1-pyrenesulfonate ion (1-PyS-) using steady-state fluorescence spectroscopy. In aqueous PAAH+C1 - solution without Na+OcS -, both 2-NpS- and 1-PyS- are in an isolated state around the polyion under the conditions studied, indicating no energy transfer between them. In the presence of Na+OcS -, on the other hand, efficient energy transfer takes place between 2-NpS- and 1-PyS-. In such a system, the aggregate of PAAH + and OcS- is formed owing to the electrostatic interaction between PAAH* and OcS- and the hydrophobic interaction among OcS - ions bound to the polyion. Both 2-NpS - and 1-PyS - are incorporated in close proximity in the hydrophobic domain of the aggregate, which leads to energy transfer between them. The concentration at which the aggregation of PAAH + and OcS- occurs was about three orders of magnitude lower than the critical micelle concentration of OcS- alone. The fluorescence probe technique using pyrene has also been employed to monitor the aggregation.
Посилання на статтю:
Aggregation of polycation and surfactant anion studied by energy transfer from 2-naphthalenesulfonate ion to 1-pyrenesulfonate ion / Tomoyuki Itaya, Hiroshi Ochiai*, Kazuyoshi Ueda and Akira Imamura // Polymer. – 1994. – Vol 35. – P. 2004-2006.