Electron Spin polarization transfer from a nitroxide incarcerated within a nanocapsule to a nitroxide in the bulk aqueous solution

Jockusch, Steffen ; Zeika, Olaf ; Jayaraj, Nithyanandhan ; Ramamurthy, V. ; Turro, Nicholas J. (2010) Electron Spin polarization transfer from a nitroxide incarcerated within a nanocapsule to a nitroxide in the bulk aqueous solution Journal of Physical Chemistry Letters, 1 (18). pp. 2628-2632. ISSN 1948-7185

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Official URL: http://pubs.acs.org/doi/abs/10.1021/jz101006s

Related URL: http://dx.doi.org/10.1021/jz101006s

Abstract

A thioxanthone derivative containing a covalently attached 15N-labeled nitroxide was incarcerated into an octaacid nanocapsule. Photoexcitation of the thioxanthone chromophore generated electron spin polarization of the nitroxide. This spin polarization of the 15N-labeled nitroxide was transferred through the walls of the carcerand to a 14N-labeled nitroxide in external bulk solvent, a process that was directly observed by time-resolved EPR spectroscopy. The efficiency of the communication between the incarcerated guest and molecules in the bulk solvent was shown to be controlled by supramolecular factors such as Coulombic attraction and repulsion between the guest@host complex and charged molecules in the bulk solvent phase.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
Keywords:Superexchange; Laser Flash Photolysis; Time-resolved EPR; TEMPO; Cucurbituril
ID Code:55867
Deposited On:19 Aug 2011 07:52
Last Modified:19 Aug 2011 07:52

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