Nitroxide spin probes for magnetic resonance characterization of ordered systems
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Ημερομηνία
Τίτλος Εφημερίδας
Περιοδικό ISSN
Τίτλος τόμου
Εκδότης
Elsevier
Περίληψη
Τύπος
Είδος δημοσίευσης σε συνέδριο
Είδος περιοδικού
peer reviewed
Είδος εκπαιδευτικού υλικού
Όνομα συνεδρίου
Όνομα περιοδικού
Colloids and Surfaces a-Physicochemical and Engineering Aspects
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Συμπληρωματικός/δευτερεύων τίτλος
Περιγραφή
Stable free radicals belonging to different classes have been synthesized in view of potential applications in studies of organized systems. Among them a new pyrroline nitroxide with a high fluorine content, 2,2,5,5-tetramethyl-3-pyrrolin-1-yloxy-3-[(1H,1H-perfluoro-1-octoxy)carbonyl] (3), apt to probe the hydrophobic perfluoro-rich domains inside macroaggregates, has been prepared by a rarely encountered approach namely the spin-labelling of the very cosurfactant participating in the self-assembling process. Emphasis has then been laid upon the synthesis of further stable free radicals from the group of substituted nitronyl nitroxides. A general experimental procedure has been adapted according to the nature of the 2-substituent, resulting in a series of nitronyl nitroxides with a wide range of hydrophobicity and showing spectral parameters in good agreement with literature values. Using the spin probe-electron spin resonance technique, 3 and the 1-H-imidazol-1-yloxy-4, 5-dihydro-4,4,5, 5-tetramethyl-2-ethyl-3-oxide (7, R = C(2)H(5)) or the 1-H-imidazol-1-yloxy-4,5-dihydro-4,4,5,5 (7, R = C(11)H(23)) have been applied in ESR investigations on vesicle phases of a zwitterionic surfactant (TDMAO)/perfluorocosurfactant (PFC) system and on Triton X-100 reverse micelles, respectively. While spin probe 3 proved to be insensitive to differences between the charged and uncharged phases, probes 7 were able to detect changes in the micelle micropolarity induced by hydration. The results corroborate well with previous W measurements in the Triton X-100 system using the same probes 7. (C) 2001 Elsevier Science B.V. All rights reserved.
Περιγραφή
Λέξεις-κλειδιά
fluorinated spin probes, nitronyl nitroxides, electron spin resonance, perfluorosurfactants, ped surfactants, perfluorinated polymeric surfactants, nitronyl nitroxides, nafion solutions, free radicals, ferromagnetic interactions, triblock copolymer, swollen membranes, aqueous-solutions, reverse micelles, phase-behavior
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Παραπομπή
Σύνδεσμος
<Go to ISI>://000168908700067
http://ac.els-cdn.com/S0927775701005039/1-s2.0-S0927775701005039-main.pdf?_tid=dde82594-356f-11e3-9574-00000aab0f27&acdnat=1381824213_576f58fa633bd048199227fcf6e06d12
http://ac.els-cdn.com/S0927775701005039/1-s2.0-S0927775701005039-main.pdf?_tid=dde82594-356f-11e3-9574-00000aab0f27&acdnat=1381824213_576f58fa633bd048199227fcf6e06d12
Γλώσσα
en
Εκδίδον τμήμα/τομέας
Όνομα επιβλέποντος
Εξεταστική επιτροπή
Γενική Περιγραφή / Σχόλια
Ίδρυμα και Σχολή/Τμήμα του υποβάλλοντος
Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας