Interaction of water-soluble cationic porphyrin with anionic surfactant.
The interaction of a cationic water-soluble porphyrin, 5,10,15,20-tetrakis [4-(3-pyridiniumpropoxy)phenyl]porphyrin tetrakisbromide (TPPOC3Py), with anionic surfactant, sodium dodecyl sulfate (SDS), in aqueous solution has been studied by means of UV-vis, (1)H NMR, fluorescence, circular dichroism (CD) spectra and dynamic laser light scattering (DLLS), and it reveals that TPPOC3Py forms porphyrin-surfactant complexes (aggregates), including ordered structures J- and H-aggregates, induced by association with surfactant monomers below the SDS critical micelle concentration (cmc), and forms micellized monomer upon the cmc, respectively. The position of TPPOC3Py in the micelle is determined, which is not in the micelle core instead of intercalated among the SDS chains, most likely with the pyridinium group extending into the polar headgroup region of the micelle.
Qiu
Wen-Ge
WG
Department of Chemical Science and Engineering, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing, PR China. qiuwenge@bjut.edu.cn
Li
Zong-Feng
ZF
Bai
Guang-Mei
GM
Meng
Sheng-Nan
SN
Dai
Hong-Xing
HX
He
Hong
H
D002942:Circular Dichroism; D008027:Light; D009682:Magnetic Resonance Spectroscopy; D011166:Porphyrins / Q000737:chemistry*; D011522:Protons; D012542:Scattering, Radiation; D012967:Sodium Dodecyl Sulfate / Q000737:chemistry; D012995:Solubility; D012996:Solutions; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet; D013501:Surface-Active Agents / Q000737:chemistry*; D014867:Water / Q000737:chemistry*
D011166:Porphyrins; D011522:Protons; D012996:Solutions; D013501:Surface-Active Agents; D014867:Water; D012967:Sodium Dodecyl Sulfate